Equity [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Preferred Units by Name [Axis] Preferred Units by Name [Axis] Preferred Units, Class [Domain] Preferred Units, Class [Domain] Depositary Share [Member] Depositary Share [Member] Depositary Share [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series A Preferred Stock [Member] Series A Preferred Stock [Member] Series B Preferred Stock [Member] Series B Preferred Stock [Member] Series C Preferred Stock [Member] Series C Preferred Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Preferred Stock, Percent Interest Per Share Preferred Stock, Percent Interest Per Share Preferred Stock, Percent Interest Per Share Preferred Stock, Capital Shares Reserved for Future Issuance Preferred Stock, Capital Shares Reserved for Future Issuance Preferred Stock, Dividend Rate, Percentage Preferred Stock, Dividend Rate, Percentage Document Period End Date Document Period End Date Preferred Stock, Liquidation Preference Per Share Preferred Stock, Liquidation Preference Per Share Preferred Stock, Shares Issued Preferred Stock, Shares Issued Preferred Stock Authorized, but not Issued Preferred Stock Authorized, but not Issued Preferred Stock Authorized, but not Issued Proceeds from Issuance of Redeemable Preferred Stock Proceeds from Issuance of Redeemable Preferred Stock Payments for Repurchase of Redeemable Preferred Stock Payments for Repurchase of Redeemable Preferred Stock Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Income Statement [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Dividends declared per common share Common Stock, Dividends, Per Share, Declared Interest income: Interest Income (Expense), Net [Abstract] Interest income Interest Income, Securities, Mortgage Backed Interest expense Interest Expense Net interest income Interest Income (Expense), Net Other gain (loss), net: Noninterest Income [Abstract] Gain (loss) on sale of investment securities, net Gain (Loss) on Sales of Mortgage Backed Securities (MBS) Unrealized loss on investment securities measured at fair value through net income, net Unrealized gain (loss) on investment securities measured at fair value through net income, net Unrealized gain (loss) on investment securities measured at fair value through net income, net Gain (loss) on derivative instruments and other securities, net Gain (loss) on derivative instruments and other securities, net Gain (loss) on derivative instruments and other securities, net Management Fee Income Management Fee Income Management Fee Income Total other gain (loss), net: Noninterest Income Expenses: Noninterest Expense [Abstract] Management fee expense Management Fee Expense Compensation and benefits Labor and Related Expense Other operating expense General and Administrative Expense Total operating expense Operating Expenses Net income Net Income (Loss) Attributable to Parent Dividend on preferred stock Preferred Stock Dividends, Income Statement Impact Issuance costs of redeemed preferred stock Issuance costs of redeemed preferred stock Costs associated with the issuance of redeemed preferred stock Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized gain (loss) on available-for-sale securities, net Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Unrealized gain on derivative instruments, net Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income (loss) available (attributable) to common stockholders Comprehensive income available to common shareholders Comprehensive income available to common shareholders Weighted average number of common shares outstanding - basic Weighted Average Number of Shares Outstanding, Basic Weighted average number of common shares outstanding - diluted Weighted Average Number of Shares Outstanding, Diluted Net income per common share - basic Earnings Per Share, Basic Net income per common share - diluted Earnings Per Share, Diluted Preferred Class B [Member] Preferred Class B [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Dividends, Preferred Stock Dividends, Preferred Stock Preferred Stock, Dividend Rate, Per-Dollar-Amount Preferred Stock, Dividend Rate, Per-Dollar-Amount Dividends, Common Stock Dividends, Common Stock Common Stock, Dividends, Per Share, Cash Paid Common Stock, Dividends, Per Share, Cash Paid Disclosure of Repurchase Agreements [Abstract] Schedule of Borrowings under Repurchase Agreements and Weighted Average Interest Rates Schedule of Borrowings under Repurchase Agreements and Weighted Average Interest Rates [Table Text Block] Schedule of Borrowings under Repurchase Agreements and Weighted Average Interest Rates [Table Text Block] Schedule of Federal Home Loan Bank Advances and Weighted Average Interest Rates [Table Text Block] Schedule of Federal Home Loan Bank Advances and Weighted Average Interest Rates [Table Text Block] Schedule of Federal Home Loan Bank Advances and Weighted Average Interest Rates [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Future [Member] Future [Member] Position [Axis] Position [Axis] Position [Domain] Position [Domain] Short [Member] Short [Member] Long [Member] Long [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Other derivative instruments [Member] Other Derivatives [Member] Other Derivatives [Member] Interest Only And Principal Only Strip [Member] Interest Only And Principal Only Strip [Member] Interest Only And Principal Only Strip [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Payer Swaption [Member] Payer Swaption [Member] Payer Swaption [Member] Interest Rate Swaption [Member] Interest Rate Swaption [Member] TBA and Forward Settling Agency Securities [Member] TBA and Forward Settling Agency Securities [Member] TBA and Forward Settling Agency Securities [Member] Purchases Of TBAs And Forward Settling Agency Securities [Member] Purchases Of TBAs And Forward Settling Agency Securities [Member] Purchases Of T B As And Forward Settling Agency Securities [Member] Interest Rate Swap [Member] Interest Rate Swap [Member] US Treasury Securities [Member] US Treasury Securities [Member] Receiver Swaption [Member] Receiver Swaption [Member] Receiver Swaption [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Only And Principal Only Strip [Member] US Treasury Securities [Member] Option Indexed to Issuer's Equity, Type [Axis] Option Indexed to Issuer's Equity, Type [Axis] Option Indexed to Issuer's Equity, Type [Domain] Option Indexed to Issuer's Equity, Type [Domain] Changes in Derivative and Other Hedge Portfolio [Roll Forward] Changes in Derivative and Other Hedge Portfolio [Roll Forward] Changes in Derivative and Other Hedge Portfolio [Roll Forward] Notional Amount Derivative Liability, Notional Amount Additions Notional Amount Of Derivatives Not Designated As Hedging Instruments Additions During The Period Notional Amount Of Derivatives Not Designated As Hedging Instruments Additions During The Period Settlement, Expirations or Exercise Notional Amount Of Derivatives Not Designated As Hedging Instruments Settlement Expiration During The Period Notional Amount Of Derivatives Not Designated As Hedging Instruments Settlement Expiration During The Period Notional Amount Amount Gain/(Loss) Recognized in Income on Derivatives Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Derivative, Notional Amount Derivative, Notional Amount Debt Securities, Trading, and Equity Securities, FV-NI Debt Securities, Trading, and Equity Securities, FV-NI Trading Securities Added During the Period Trading Securities Added During the Period Trading Securities Added During the Period Notional Amount Of Trading Securities Settlement Expiration During The Period Notional Amount Of Trading Securities Settlement Expiration During The Period Notional Amount Of Trading Securities Settlement Expiration During The Period Gain Loss on Other Debt Gain Loss on Other Debt Gain Loss on Other Debt Repurchase Agreements And Other Debt Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Derivative By Maturity Years [Axis] Derivative By Maturity Years [Axis] Derivative By Maturity Years [Axis] Derivative By Maturity Years [Domain] Derivative By Maturity Years [Domain] [Domain] for Derivative By Maturity Years [Axis] 30 Year Maturity [Member] 30 Year Maturity [Member] 30 Year Maturity [Member] 15 Year Maturity [Member] 15 Year Maturity [Member] 15 Year Maturity [Member] Derivatives by Issuer [Axis] Derivatives by Issuer [Axis] Derivatives by Issuer [Axis] Derivatives by Issuer [Domain] Derivatives by Issuer [Domain] [Domain] for Derivatives by Issuer [Axis] Government National Mortgage Association Certificates and Obligations (GNMA) [Member] Government National Mortgage Association Certificates and Obligations (GNMA) [Member] Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] Derivative Position [Axis] Derivative Position [Axis] Derivative Position [Axis] Derivative Position [Domain] Derivative Position [Domain] Derivative Position [Domain] 2.5% Coupon [Member] 2.5% Coupon [Member] 2.5% Coupon [Member] 3.0% Coupon [Member] 3.0% Coupon [Member] 3.0% Coupon [Member] 3.5% Coupon [Member] 3.5% Coupon [Member] 3.5% Coupon [Member] 4.0% Coupon [Member] 4.0% Coupon [Member] 4.0% Coupon [Member] 4.5% Coupon [Member] 4.5% Coupon [Member] 4.5% Coupon [Member] Derivative [Line Items] Derivative [Line Items] Cost Basis Derivative, Forward Settlement Value Derivative, Forward Settlement Value Net long TBA position, at fair value Derivative Asset, Fair Value, Gross Asset TBA, net carrying value Derivative, Fair Value, Net Pledged Assets [Abstract] Pledged Assets [Abstract] Repurchase Agreements with Counterparties Greater than or equal to 5% of Equity at Risk [Table] Repurchase Agreements with Counterparties Greater than or equal to 5% of Equity at Risk [Table] Repurchase Agreements with Counterparties Greater than or equal to 5% of Equity at Risk [Table] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] FICC [Member] FICC [Member] FICC [Member] J.P. Morgan Securities, LLC [Member] J.P. Morgan Securities, LLC [Member] J.P. Morgan Securities, LLC [Member] Repurchase Agreements with Counterparties Greater than or equal to 5% of Equity at Risk [Line Items] Repurchase Agreements with Counterparties Greater than or equal to 5% of Equity at Risk [Line Items] [Line Items] for Repurchase Agreements with Counterparties Greater than or equal to 5% of Equity at Risk [Table] Securities Sold under Agreements to Repurchase Securities Sold under Agreements to Repurchase Risk Of Repurchase Agreement To Stockholders Equity Risk Of Repurchase Agreement To Stockholders Equity Risk Of Repurchase Agreement To Stockholders Equity Weighted Average Days to Maturity Repurchase Agreements Weighted Average Days To Maturity Repurchase Agreements Weighted Average Days To Maturity Counterparty Exposure, Net Counterparty Exposure, Net Represents the net carrying value of the securities pledged under repurchase agreements, including accrued interest plus any cash or assets on deposit to secure the repurchase obligation, less the amount of the repurchase liability, including accrued interest. Repurchase Agreements Weighted Average Months To Maturity Repurchase Agreements Weighted Average Months To Maturity Repurchase Agreements Weighted Average Months To Maturity Investments, Debt and Equity Securities [Abstract] Schedule of Trading Securities and Other Trading Assets [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Fixed Income Securities [Member] Fixed Income Securities [Member] Adjustable-Rate [Member] Adjustable-Rate [Member] Adjustable-Rate [Member] Collateralized Mortgage Obligations [Member] Collateralized Mortgage Obligations [Member] Agency Securities [Member] Agency Securities [Member] Mortgage-backed Securities, Issued by Private Enterprises [Member] Mortgage-backed Securities, Issued by Private Enterprises [Member] Commercial Mortgage Backed Securities [Member] Commercial Mortgage Backed Securities [Member] Credit Risk Transfer Securities [Member] Credit Risk Transfer Securities [Member] GSE Credit Risk Transfer Securities [Member] Debt Securities, Trading and Available-for-sale, Amortized Cost Basis Debt Securities, Trading and Available-for-sale, Amortized Cost Basis Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) at cost. Debt Securities, Trading and Available-for-sale Debt Securities, Trading and Available-for-sale Total agency MBS, at fair value Total Agency Securities Represents total investment in agency securities at fair value. Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Schedule of Investments [Table] Schedule of Investments [Table] Fannie Mae [Member] Freddie Mac [Member] Ginnie Mae [Member] Eligible Item or Group for Fair Value Option [Axis] Available-for-sale Securities [Member] Available-for-sale Securities [Member] Trading Securities [Member] Trading Securities [Member] Investment in debt security remeasured at fair value through earnings (trading securities) Securities Remeasured at Fair Value [Member] Securities Remeasured at Fair Value [Member] Securities Remeasured at Fair Value Through Earnings [Member] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Agency securities transferred to consolidated VIEs Variable Interest Entity, Consolidated, Carrying Amount, Assets Par value Available For Sale Securities Par Available For Sale Securities Par Unamortized discount Debt Instrument, Unamortized Discount Unamortized premium Debt Instrument, Unamortized Premium Debt Securities, Trading, Unrealized Gain Debt Securities, Trading, Unrealized Gain Debt Securities, Trading, Unrealized Loss Debt Securities, Trading, Unrealized Loss Debt Securities, Trading Debt Securities, Trading Amortized cost Available-for-sale Securities, Amortized Cost Basis Trading Securities, Cost Trading Securities, Cost Gross unrealized gains Available-for-sale Securities, Gross Unrealized Gain Gross unrealized losses Available-for-sale Securities, Gross Unrealized Loss Total available-for-sale securities, at fair value Debt Securities, Available-for-sale Trading Securities Par Trading Securities Par Trading Securities Par Value Weighted average coupon Debt, Weighted Average Interest Rate Weighted average yield Weighted Average Yield Percentage WeightedAverageYieldPercentage Future Prepayment Rate Assumption Of Investment Portfolio Future Prepayment Rate Assumption Of Investment Portfolio Average future constant repayment rate assumption of Investment Portfolio. Mortgage Backed Securities Amortized Cost Mortgage Backed Securities Amortized Cost Mortgage Backed Securities Amortized Cost Equity Incentive Plan [Abstract] Equity Incentive Plan [Abstract] Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Other Derivatives [Member] Forward Contracts [Member] Forward Contracts [Member] Derivative Contract [Domain] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Domain] Discontinuation of Election to Account for Interest Rate Swaps as Designated Cash Flow Hedges [Member] Discontinuation of Election to Account for Interest Rate Swaps as Designated Cash Flow Hedges [Member] Derivative Instrument Risk [Axis] Net Unrealized Gain (Loss) on Swaps Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge Average Maturity (Years) Derivative, Average Remaining Maturity Cash Flow Hedges Derivative Instruments Not Designated As Hedging Instruments Average Months To Expiration Cash Flow Hedges Derivative Instruments Not Designated As Hedging Instruments Average Months To Expiration Cash Flow Hedges Derivative Instruments Not Designated As Hedging Instruments Average Months To Expiration Notional Amount Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Notional Amount Of Derivatives Not Designated As Hedging Instruments Additions During The Period Notional Amount Of Derivatives Not Designated As Hedging Instruments Settlement Expiration During The Period Derivative, Average Fixed Interest Rate Derivative, Average Fixed Interest Rate Interest Rate Derivatives, at Fair Value, Net Interest Rate Derivatives, at Fair Value, Net Options At Cost Options At Cost Options At Cost Interest Rate Derivative Not Designated As Hedging Instruments Receive Rate Interest Rate Derivative Not Designated As Hedging Instruments Receive Rate Interest Rate Derivative Not Designated As Hedging Instruments Receive Rate Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] Common Stock At The Market Sale Agreement [Member] Common Stock At The Market Sale Agreement [Member] Common Stock At The Market Sale Agreement [Member] Common stock, Value of Shares Approved for Future Issuance Common stock, Value of Shares Approved for Future Issuance The dollar value amount approved to issue common stock under an At-the-Market Offering program. Common Stock, Shares Authorized Common stock, Value of Shares Remaining for Future Issuance The remaining dollar value amount approved to issue common stock under an At-the-Market program Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Stock Issued During Period, Value, New Issues Stock Issued During Period, Value, New Issues Sale of Stock, Price Per Share Sale of Stock, Price Per Share Plan Name [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Plan Name [Domain] Plan Name [Domain] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Common Stock [Member] Common Stock [Member] Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Repurchase of common stock shares Stock Repurchased During Period, Shares Average repurchase price (in dollars per share) Treasury Stock Acquired, Average Cost Per Share Repurchase of common stock, value Stock Repurchased During Period, Value Payments for Repurchase of Common Stock Payments for Repurchase of Common Stock Offsetting Assets and Liabilities [Table] Offsetting Assets and Liabilities [Table] Offsetting Assets and Liabilities [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Reverse Repurchase Agreements [Member] Reverse Repurchase Agreements [Member] Reverse Repurchase Agreements [Member] Repurchase Agreements [Member] Repurchase Agreements [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Assets [Member] Assets [Member] Liability [Member] Liability [Member] ERROR in label resolution. Swaption [Member] Offsetting Assets and Liabilities [Line Items] Offsetting Assets and Liabilities [Line Items] [Line Items] for Offsetting Assets and Liabilities [Table] Gross Amounts of Recognized Assets Gross Amount of Recognized Assets (Liabilities) Fair value before effects of master netting arrangements, of a financial asset or liability or other contract and the contract can be net settled by means outside the contract or delivery of an asset or liability. Gross Amount Offset in the Consolidated Balance Sheets Gross Amount Offset in the Consolidated Balance Sheets Fair value before effects of master netting arrangements, of a financial asset or liability or other contract and the contract can be net settled by means outside the contract or delivery of an asset or liability offset in the consolidated balance sheets Net Amounts of Assets Presented in the Consolidated Balance Sheets Net Amount of Assets (Liabilities) Presented on the Balance Sheet Fair value after effects of master netting arrangements, of a financial asset or liability or other contract and the contract can be net settled by means outside the contract or delivery of an asset or liability. Financial Instruments Gross Amounts of Financial Instruments Not Offset on the Balance Sheet Fair value of financial asset or liability or other contract elected not to be offset against an obligation to return collateral or right to receive collateral pledged under a master netting arrangement. Collateral Received Gross Amounts of Cash Collateral Not Offset on the Balance Sheet Gross Amounts of Cash Collateral Not Offset on the Balance Sheet Net Amount Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet Net amount after deducting gross amounts not offset on the balance sheet from net amount of assets (liabilities) presented on the balance sheet. Equity Incentive Plans [Abstract] Equity Incentive Plans [Abstract] Distribution Type [Axis] Distribution Type [Axis] Distribution Type [Domain] Distribution Type [Domain] Share Distribution [Member] Share Distribution [Member] Issued To [Axis] Issued To [Axis] Parties the RSU's were issued to [Axis] Issued To [Domain] Issued To [Domain] [Domain] for Parties the RSU's were issued to [Axis] Director [Member] Director [Member] Performance Shares [Member] Performance Shares [Member] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Plan Name [Axis] Plan Name [Axis] 2016 Equity Plan [Member] 2016 Equity Plan [Member] 2016 Equity Plan [Member] Director Plan [Member] Director Plan [Member] Director Plan [Member] MTGE Incentive Plan [Member] MTGE Incentive Plan [Member] MTGE Incentive Plan [Member] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Restricted Stock or Unit Expense Restricted Stock or Unit Expense Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent Deferred Shares Outstanding Deferred Shares Outstanding RSU awards under 2016 Equity Plan Allocated Share-based Compensation Expense Allocated Share-based Compensation Expense Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Accrued RSU Dividend Equivalents Accrued RSU Dividend Equivalents Accrued RSU Dividend Equivalents during period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Vest Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Vest Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Vest Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Preferred Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Retained Earnings (Accumulated Deficit) [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Balance, value Stockholders' Equity Attributable to Parent Balance, Common Stock, shares Common Stock, Shares, Outstanding Net income (loss) Unrealized Gains and (Losses), Net Amounts reclassified from accumulated OCI Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options Proceeds from Issuance of Preferred Stock and Preference Stock Proceeds from Issuance of Preferred Stock and Preference Stock Stock Redeemed or Called During Period, Shares Stock Redeemed or Called During Period, Shares Preferred Stock, Redemption Amount Stock Redeemed or Called During Period, Value Issuance costs of redeemed preferred stock Repurchase of common stock Payments for Repurchase of Common Stock Preferred dividends declared Dividends, Preferred Stock, Cash Common dividends declared Dividends, Common Stock, Cash Balance, value Balance, Common Stock, shares Unrealized Loss Position For - Estimated Fair Value - Less than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Unrealized Loss Position For - Unrealized Loss - Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Unrealized Loss Position For - Estimated Fair Value - 12 Months or More Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Unrealized Loss Position For - Unrealized Loss - 12 Months or More Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Unrealized Loss Position For - Estimated Fair Value - Total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Unrealized Loss Position For - Unrealized Loss - Total Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Federal Home Loan Bank Advances by Maturity [Abstract] Federal Home Loan Bank Advances by Maturity [Abstract] Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] 37 to 48 months [Member] 37 to 48 months [Member] 37 to 48 months [Member] Federal Home Loan Bank Advances, Maturity Period [Axis] Federal Home Loan Bank Advances, Maturity Period [Axis] Federal Home Loan Bank Advances, Maturity Period [Axis] Federal Home Loan Bank Advances, Maturity Period [Domain] Federal Home Loan Bank Advances, Maturity Period [Domain] [Domain] for Federal Home Loan Bank Advances, Maturity Period [Axis] 49 to 60 Months [Member] 49 to 60 Months [Member] 49 to 60 Months [Member] Maturity Less than 30 Days [Member] Maturity Less than 30 Days [Member] thirty one to ninety [Member] thirty one to ninety [Member] thirty one to ninety [Member] 4 to 6 Months [Member] 4 to 6 Months [Member] 4 to 6 Months [Member] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Short-term Debt [Line Items] Short-term Debt [Line Items] Short-term Debt, Percentage Bearing Fixed Interest Rate Short-term Debt, Percentage Bearing Fixed Interest Rate Advances from Federal Home Loan Banks Advances from Federal Home Loan Banks Accounting Policies [Abstract] Gain (Loss) on Contract Termination Gain (Loss) on Contract Termination Required Annual Distribution of Taxable Net Income Required Annual Distribution of Taxable Net Income Required Annual Distribution of Taxable Net Income Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit Income Tax Disclosure [Abstract] Federal Income Tax Note [Table] Federal Income Tax Note [Table] Tax Characterization [Axis] Tax Characterization [Axis] Tax Characterization [Axis] Tax Characterization [Domain] Tax Characterization [Domain] Tax Characterization [Domain] Investments, Owned, Federal Income Tax Note [Line Items] Investments, Owned, Federal Income Tax Note [Line Items] Narrative [Abstract] Narrative [Abstract] Related Party Transactions Disclosure [Text Block] Related Party Transactions Disclosure [Text Block] Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Derivative [Member] Derivative [Member] Investment Securities Class [Axis] Investment Securities Class [Axis] Investment Securities Class [Domain] Investment Securities Class [Domain] Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Securities Sold under Agreements to Repurchase [Member] Securities Sold under Agreements to Repurchase [Member] Assets Pledged to Us [Member] Assets Pledged to Us [Member] Assets Pledged to Us [Member] Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment Federal Home Loan Bank Stock Federal Home Loan Bank Stock Obligation to Return Securities Borrowed Under Reverse Repurchase Agreements at Fair Value Obligation to Return Securities Borrowed Under Reverse Repurchase Agreements at Fair Value Obligation to Return Securities Borrowed Under Reverse Repurchase Agreements at Fair Value Restricted Cash and Cash Equivalents Restricted Cash and Cash Equivalents Restricted Cash and Securities Pledged Restricted Cash and Securities Pledged Restricted Cash and Securities Pledged Risk of interest swap and swaption agreements to stockholders' equity Credit Derivative, Maximum Exposure, Undiscounted Statement of Cash Flows [Abstract] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Interest Paid, Including Capitalized Interest, Operating and Investing Activities Interest Paid, Including Capitalized Interest, Operating and Investing Activities Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Amortization of premiums and discounts on mortgage-backed securities, net Accretion (Amortization) of Discounts and Premiums, Investments Amortization of accumulated other comprehensive loss on interest rate swaps de-designated as qualifying hedges Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, De-Designated Interest Rate Swaps Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, De-Designated Interest Rate Swaps Amortization of intangible assets Amortization of Intangible Assets Stock based compensation Share-based Compensation (Gain) loss on sale of investment securities, net Unrealized loss on investment securities measured at fair value through net income, net Net unrealized gain (loss) on investment securities measured at fair value through net income Net unrealized gain (loss) on investment securities measured at fair value through net income (Gain) loss on derivative instruments and other securities, net Loss On Derivative Instruments And Trading Securities Net Loss on derivative instruments and trading securities, net (Increase) decrease in other assets Increase (Decrease) in Other Operating Assets Increase in accounts payable and other accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of Agency mortgage-backed securities Payments to Acquire Mortgage-backed Securities (MBS), Available-for-sale Purchases of credit risk transfer and non-Agency securities Payments To Acquire Non- Agency Mortgage Backed Securities Payments To Acquire Non- Agency Mortgage Backed Securities Proceeds from sale of Agency mortgage-backed securities Proceeds from Sale of Mortgage-backed Securities (MBS), Available-for-sale Proceeds from sale of credit risk transfer and non-Agency securities Proceeds from sale of Credit Risk Transfer and non-Agency securities Proceeds from sale of CRT and non-Agency securities Principal collections on Agency mortgage-backed securities Proceeds From Principal Collection Of Mortgage Backed Securities Categorized As Available For Sale The cash inflow from collection of principal from borrowers on mortgage backed securities held. Principal collections on credit risk transfer and non-Agency securities Principal collections on credit risk transfer and non-Agency securities Principal collections on CRT and non-Agency securities Payments on U.S. Treasury securities Payments to Acquire Available-for-sale Securities Proceeds from U.S. Treasury securities Proceeds from Sale of Available-for-sale Securities Net payments on reverse repurchase agreements Proceeds from (Payments for) Securities Purchased under Agreements to Resell Net proceeds from (payments on) derivative instruments Payments for (Proceeds from) Derivative Instrument, Financing Activities Purchase of AGNC Mortgage Management, LLC, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Net proceeds from (payments on) other investing activity Payments for (Proceeds from) Other Investing Activities Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from repurchase arrangements Proceeds from Short-term Debt Payments on repurchase agreements Repayments of Short-term Debt Proceeds from Federal Home Loan Bank advances Proceeds from FHLBank Advance, Investing Activities Payments on Federal Home Loan Bank advances Payments of FHLBank Borrowings, Financing Activities Payments on debt of consolidated variable interest entities Repayments of Other Debt Net proceeds from preferred stock issuance Payment for preferred stock redemption Payments for Repurchase of Preferred Stock and Preference Stock Payment for preferred stock redemption Net proceeds from common stock issuances Proceeds from Issuance of Common Stock Payment for common stock repurchases Cash dividends paid Payments of Dividends Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash and cash equivalents at end of period Cash and Cash Equivalents, at Carrying Value Supplemental disclosure to cash flow information: Supplemental Cash Flow Information [Abstract] Income Taxes Paid Income Taxes Paid Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Derivative Instruments Designation [Axis] Derivative Instruments Designation [Axis] Derivative Instruments Designation [Axis] Derivative Instruments Designation [Domain] Derivative Instruments Designation [Domain] [Domain] for Derivative Instruments Designation [Axis] Derivatives By Maturity [Axis] Derivatives By Maturity [Axis] Derivatives By Maturity [Axis] Derivatives by Maturity [Domain] Derivatives by Maturity [Domain] Derivatives by Maturity [Domain] Less Than or Equal to One Year [Member] Less Than or Equal to One Year [Member] Less Than or Equal to One Year [Member] Greater Than One Year and Less Than or Equal to Two Years [Member] Greater Than One Year and Less Than or Equal to Two Years [Member] Greater Than One Year and Less Than or Equal to Two Years [Member] Greater Than Two Years and Less Than or Equal to Three Years [Member] Greater Than Two Years and Less Than or Equal to Three Years [Member] Greater Than Two Years and Less Than or Equal to Three Years [Member] Greater Than One Year and Less Than or Equal to Three Years [Member] Greater Than One Year and Less Than or Equal to Three Years [Member] Greater Than One Year and Less Than or Equal to Three Years [Member] Greater Than Three Years and Less Than or Equal to Five Years [Member] Greater Than Three Years and Less Than or Equal to Five Years [Member] Greater Than Three Years and Less Than or Equal to Five Years [Member] Greater Than Five Years and Less than or Equal to Seven Years [Member] Greater Than Five Years and Less than or Equal to Seven Years [Member] Greater Than Five Years and Less than or Equal to Seven Years [Member] Greater Than Seven Years and Less than or Equal to Ten Years [Member] Greater Than Seven Years and Less than or Equal to Ten Years [Member] Greater Than Seven Years and Less than or Equal to Ten Years [Member] Greater Than Ten Years [Member] Greater Than Ten Years [Member] Greater Than Ten Years [Member] Interest Rate Swaps Excluding Forward Starting [Member] Interest Rate Swaps Excluding Forward Starting [Member] Interest Rate Swaps Excluding Forward Starting [Member] Average Fixed Pay Rate Average Receive Rate Derivative, Average Variable Interest Rate Derivative, Notional Amount Weighted Average Forward Start Date Weighted Average Forward Start Date Weighted Average Forward Start Date Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Domain] Discontinuation of Election to Account for Interest Rate Swaps as Designated Cash Flow Hedges [Member] Beginning OCI Balance Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax 2017 Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Amounts reclassified from accumulated OCI Other Comprehensive Income Reclassification Adjustment For Sale Of Security Reversal Of Prior Period Unrealized Gain And Losses On Realization Other Comprehensive Income Reclassification Adjustment For Sale Of Security Reversal Of Prior Period Unrealized Gain And Losses On Realization Ending OCI Balance Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Reversal of Unrealized (Gains) and Losses, Net on Realization Document and Entity Information [Abstract] -- None. No documentation exists for this element. -- Document Type Document Type Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Current Fiscal Year End Date Current Fiscal Year End Date Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Trading Symbol Trading Symbol Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] At Cost Basis [Member] At Cost Basis [Member] At Cost Basis [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Fair Value Hedging [Member] Fair Value Hedging [Member] 10 Year Maturity [Member] 10 Year Maturity [Member] 10 Year Maturity [Member] 5 Year Maturity [Member] 5 Year Maturity [Member] 5 Year Maturity [Member] 7 Years Maturity [Member] 7 Years Maturity [Member] 7 Years Maturity [Member] At Par Value [Member] At Par Value [Member] At Par Value [Member] Derivative, Forward Settlement Value Derivative Asset, Fair Value, Gross Asset Derivative, Fair Value, Net U.S. Treasury securities, net government bonds owned and sold short net government bonds owned and sold short net Weighted Average Yield Percentage Schedule of Securities and Cash Pledged as Collateral from Counterparties [Table Text Block] Schedule of Securities and Cash Pledged as Collateral from Counterparties [Table Text Block] Schedule of Securities and Cash Pledged as Collateral from Counterparties [Table Text Block] Schedule of Financial Instruments Owned and Pledged as Collateral Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] Schedules Of Securities Pledged As Collateral Under Repurchase Agreement Schedules Of Securities Pledged As Collateral Under Repurchase Agreement [Text Block] [Table Text Block] Schedules Of Securities Pledged As Collateral Under Repurchase Agreement [Text Block] [Table Text Block] Offsetting Assets and Liabilities Offsetting Assets [Table Text Block] Offsetting Liabilities Offsetting Liabilities [Table Text Block] Under Prime Broker Agreements [Member] Under Prime Broker Agreements [Member] Under Prime Broker Agreements [Member] Excluding Cash Received [Member] Excluding Cash Received [Member] Excluding Cash Received [Member] Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity, Primary Beneficiary [Member] Includes Sold But Not Yet Settled Securities [Member] Includes Sold But Not Yet Settled Securities [Member] Includes Sold But Not Yet Settled Securities [Member] Non-Agency [Member] Non-Agency [Member] Non-Agency securities AAA Non-Agency Mortgage-Backed Securities [Member] AAA Non-Agency Mortgage-Backed Securities [Member] AAA rated Non-Agency Mortgage-Backed Securities [Member] Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment Security Owned and Pledged as Collateral, Fair Value Retained Interests in Consolidated VIE's Pledged as Collateral Under Repurchase Agreements Retained Interests in Consolidated VIE's Pledged as Collateral Under Repurchase Agreements Retained Interests in Consolidated VIE's Pledged as Collateral Under Repurchase Agreements Accrued interest on pledged securities Available For Sale Securities Pledged As Collateral Accrued Interest AvailableForSaleSecuritiesPledgedAsCollateralAccruedInterest Restricted cash and cash equivalents Total Fair Value of Securities Pledged and Accrued Interest Total Fair Value of Securities Pledged and Accrued Interest Total Fair Value of Securities Pledged and Accrued Interest Total Fair Value Of Agency Securities Pledged And Accrued Interest Total Fair Value Of Agency Securities Pledged And Accrued Interest Total Fair Value Of Agency Securities Pledged And Accrued Interest New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Derivatives, Policy [Policy Text Block] Derivatives, Policy [Policy Text Block] Investment, Policy [Policy Text Block] Investment, Policy [Policy Text Block] Interest Income [Policy Text Block] Interest Income [Policy Text Block] Interest Income [Policy Text Block] Management Agreement [Text Block] Management Agreement [Text Block] MTGE Management Agreement [Text Block] Schedule of Outstanding Derivatives Not Designated as Hedging Instruments Schedule of Outstanding Derivatives Not Designated as Hedging Instruments [Table Text Block] Schedule of Outstanding Derivatives Not Designated as Hedging Instruments [Table Text Block] Schedule Of Interest Rate Swap Agreement By Remaining Maturity Schedule Of Interest Rate Swap Agreement By Remaining Maturity [Table Text Block] Schedule Of Interest Rate Swap Agreement By Remaining Maturity [Table Text Block] Schedule of Interest Rate Swaption Agreements Outstanding Schedule of Interest Rate Swaption Agreements Outstandin [Table Text Block] Schedule of Interest Rate Swaption Agreements Outstandin [Table Text Block] US government securities US government securities [Table Text Block] US government securities [Table Text Block] US Government Futures Securities [Table Text Block] US Government Futures Securities [Table Text Block] US Government Futures Securities [Table Text Block] Summary of Long and Short Position of Derivative Instruments Schedule of Long and Short Position of Derivative Instruments [Table Text Block] Schedule of Long and Short Position of Derivative Instruments [Table Text Block] Schedule Of Outstanding Not Designated As Hedging Instruments Schedule Of Outstanding Not Designated As Hedging Instruments [Table Text Block] Schedule Of Outstanding Not Designated As Hedging Instruments [Table Text Block] Schedule of Stock by Class [Table Text Block] Schedule of Stock by Class [Table Text Block] Dividends Declared [Table Text Block] Dividends Declared [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Derivative and Other Hedging Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock, Dividends, Per Share, Declared Maturity 31 To 59 Days [Member] Maturity 31 To 59 Days [Member] Maturity 31 To 59 Days [Member] Maturity 60 To 90 Days [Member] Maturity 60 To 90 Days [Member] Maturity 60 To 90 Days [Member] Maturity over 90 days [Member] Maturity Greater than 90 Days [Member] 2 Days to 1 Month [Member] 2 Days to 1 Month [Member] U.S. Treasury Repurchase Agreements from 2 Days to 1 Month [Member] Retained Interests in Consolidated VIE's Pledged as Collateral Under Repo Security Owned and Pledged as Collateral, Fair Value Agency Securities Pledged As Collateral Amortized Cost Agency Securities Pledged As Collateral Amortized Cost Item represents agency securities pledged as collateral at amortized cost. Agency Securities Pledged As Collateral Accrued Interest Agency Securities Pledged As Collateral Accrued Interest Item represents accrued interest on agency securities pledged as collateral. Securities Received as Collateral, Amount Repledged and Sold Collateral Securities Repledged, Delivered, or Used Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Derivative liabilities, at fair value [Member] Derivative Financial Instruments, Liabilities [Member] Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] TBA and Forward Settling Agency Securities [Member] Sale Of TBA And Forward Settling Agency Securities [Member] Sale Of TBA And Forward Settling Agency Securities [Member] Sale Of T B A And Forward Settling Agency Securities [Member] Fair Value by Liability Class [Axis] Liability Class [Axis] Fair Value, Liabilities, Measured on Recurring Basis, Unobservable Input Reconciliation, by Liability Class [Domain] Fair Value by Liability Class [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Transfers between hierarchy levels Transfers Between Hierarchy Levels Transfers between hierarchy levels Agency securities Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value Non-Agency Securities, at Fair Value Non-Agency Securities, at Fair Value Non-Agency Securities, at Fair Value Financial Instruments, Owned, Other, at Fair Value Financial Instruments, Owned, Other, at Fair Value U.S. Treasury securities Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value Equity Securities, FV-NI Equity Securities, FV-NI TBA securities Derivative Asset Derivative Liability Derivative Liability Total assets Assets, Fair Value Disclosure Debt of consolidated variable interest entities, at fair value Other Long-term Debt Obligation to return securities borrowed under reverse repurchase agreements, at fair value Interest rate swaps Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Schedule of Assets Sold under Agreements to Repurchase [Table] Schedule of Assets Sold under Agreements to Repurchase [Table] Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] Maturity Overnight [Member] Maturity Overnight [Member] 30 Days or Less [Member] 1 to 3 Months 3 to 6 Months 6 to 9 Months 7 to 9 months [Member] 7 to 9 months [Member] 9 to 12 Months 10 to 12 Months [Member] 10 to 12 Months [Member] 12 to 24 Months 13 to 24 Months [Member] 13 to 24 Months [Member] 24 to 36 Months 25 to 36 months [Member] 25 to 36 months [Member] 36 to 48 months 48 to 60 Months Repurchase Agreements Weighted Average Interest Rate Short-term Debt, Weighted Average Interest Rate, at Point in Time Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Follow-On Public Offering [Member] Follow-On Public Offering [Member] Follow-On Public Offering [Member] Class of Stock [Line Items] Class of Stock [Line Items] Related Party Transactions [Abstract] Management fees Monthly Management Fee Income Monthly Management Fee Income Monthly Management Fee Income Related Party Transaction, Expenses from Transactions with Related Party Related Party Transaction, Expenses from Transactions with Related Party Labor and Related Expense Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Bethesda Securities [Member] Bethesda Securities [Member] Bethesda Securities [Member] TBA securities Fifteen Year and Thirty Year Securities [Member] TBA securities Fifteen Year and Thirty Year Securities [Member] TBA securities [Member] Assets Sold under Agreements to Repurchase [Line Items] Assets Sold under Agreements to Repurchase [Line Items] Receivable Under Reverse Repurchase Agreements Receivable Under Reverse Repurchase Agreements Receivable Under Reverse Repurchase Agreements Derivative, Forward Settlement Value Percentage of Repurchase Agreement Funding Percentage of Repurchase Agreement Funding Percentage of Repurchase Agreement Funding Weighted Average Forward Start Days Weighted Average Forward Start Days Weighted Average Forward Start Days Short-term Debt, Weighted Average Interest Rate, at Point in Time Debt of consolidated variable interest entities, at fair value Description of variable rate basis Debt Instrument, Description of Variable Rate Basis Basis spread over LIBOR Spread Over LIBOR Spread Over LIBOR Principal amount Debt Instrument, Face Amount Weighted average life of other debt Weighted Average Life Other Debt Weighted Average Life Other Debt Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Mortgage-backed Securities Available-for-sale, Fair Value Disclosure Mortgage-backed Securities Available-for-sale, Fair Value Disclosure Net long TBA position, at fair value Unamortized premium balance Debt Instrument, Unamortized Discount (Premium), Net Weighted average expected constant prepayment rate Weighted Average Coupon Rate Weighted Average Coupon Rate Weighted Average Coupon Rate Underlying Collateral Coupon Underlying Collateral Coupon Underlying Collateral Coupon Securities Remeasured at Fair Value Through Earnings, Debt Securities Securities Remeasured at Fair Value Through Earnings, Debt Securities Amount of debt securities remeasured at fair value through earnings. Agency securities, total fair value Securities Held as Collateral, at Fair Value Variable Interest Entity, Consolidated, Carrying Amount, Assets Debt, at fair value Fair value of CMO securities and interest-only and principal-only strips Fair Value Of CMO Securities Directly Held The sum of the fair values, as of the date of each statement of financial position presented, of directly held CMO securities and interest-only securities including retained interest in transfers treated as sales but excluding securities held by consolidated CMO trust. Securitized CMO Securities Securitized CMO Securities The sum of the fair values, as of the date of each statement of financial position presented, of directly held CMO securities and interest-only securities including retained interest in transfers treated as sales and the fair value of securities held by consolidated CMO trusts. CMO and Interest Only, Principal Only Securities, Maximum Loss Exposure CMO and Interest Only, Pricincipal Only Securities, Maximum Loss Exposure CMO and Interest Only and Pricincipal Only Securities, Maximum Loss Exposure Variable Interest Entities [Abstract] Variable Interest Entities [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Other Long-term Debt Debt Instrument, Description of Variable Rate Basis Spread Over LIBOR Weighted Average Life Other Debt Director Plan [Abstract] Director Plan [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Securities by Credit Rating [Table Text Block] Securities by Credit Rating [Table Text Block] [Table Text Block] for Securities by Credit Rating [Table] Available-for-sale Securities [Table Text Block] Available-for-sale Securities [Table Text Block] Components of Investment Securities Components of Investment Securities [Table Text Block] Components of Investment Securities [Table Text Block] Summary Of Agency Securities Estimated Weighted Average Life Classifications Summary of Mortgage Backed Securities Estimated Weighted Average Life Classifications [Table Text Block] Summary of Mortgage Backed Securities Estimated Weighted Average Life Classifications [Table Text Block] Summary of Continuous Unrealized Loss Position of Available for Sale Securities Summary of Continuous Unrealized Loss Position of Available for Sale Securities [Table Text Block] Summary of Continuous Unrealized Loss Position of Available for Sale Securities [Table Text Block] Summary of Net Gain from Sale of Agency Securities Summary of Net Gain from Sale of Mortgage Backed Securities [Table Text Block] Summary of Net Gain from Sale of Mortgage Backed Securities [Table Text Block] Cost and Proceeds of Investment Securities [Member] Cost and Proceeds of Investment Securities [Member] Cost and Proceeds of Investment Securities [Member] Gross Gain & Loss of Investment Securities [Member] Gross Gain & Loss of Investment Securities [Member] Gross Gain & Loss of Investment Securities [Member] Guarantor Obligations by Underlying Asset Class [Axis] Underlying Asset Class [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Securities (Assets) [Member] Securities (Assets) [Member] Agency MBS sold, at cost Cost Of Sale Of Available For Sale Secuities CostOfSaleOfAvailableForSaleSecuities Cost of Sale of Fair Value Option Securities Cost of Sale of Fair Value Option Securities Cost of Sale of Fair Value Option Securities Cost of Sale of Investment Securities Cost of Sale of Investment Securities Cost of Sale of Investment Securities Proceeds from agency MBS sold Net gain (loss) on sale of investment securities Gross gain on sale of investment securities Marketable Securities, Realized Gain (Loss) Gross loss on sale of investment securities Available-for-sale Securities, Gross Realized Losses Intended annual distribution of taxable net income Intended Annual Distribution of Taxable Net Income Intended Annual Distribution of Taxable Net Income Credit Rating [Axis] Credit Rating [Axis] Credit Rating [Axis] Credit Rating [Domain] Credit Rating [Domain] [Domain] for Credit Rating [Axis] BBB Rating [Member] BBB Rating [Member] BBB Rating [Member] BB Rating [Member] BB Rating [Member] BB Rating [Member] AAA Rating [Member] AAA Rating [Member] AAA Rating [Member] AA Rating [Member] AA Rating [Member] AA Rating [Member] A Rating [Member] A Rating [Member] A Rating [Member] B Rating [Member] B Rating [Member] B Rating [Member] Not Rated [Member] Not Rated [Member] Not Rated [Member] Agency securities remeasured at fair value through earnings [Member] Agency securities remeasured at fair value through earnings [Member] Agency Securities Remeasured At Fair Value Through Earnings [Member] Consolidated Balance Sheets (Parenthetical) [Abstract] Consolidated Balance Sheets (Parenthetical) [Abstract] Financial Instruments Owned and Pledged as Collateral [Table] Financial Instruments Owned and Pledged as Collateral [Table] Asset Pledged as Collateral [Member] Asset Pledged as Collateral [Member] Receivable for securities sold [Member] Receivable for securities sold [Member] Receivable for securities sold [Member] Financial Instruments Owned and Pledged as Collateral [Line Items] Financial Instruments Owned and Pledged as Collateral [Line Items] Debt Instrument, Fair Value Disclosure Debt Instrument, Fair Value Disclosure Preferred Stock B, Liquidation Preference, Value Preferred Stock B, Liquidation Preference, Value Value of the difference between preference in liquidation and the par or stated values of the preferred B shares. Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Preferred Stock C, Liquidation Preference, Value Preferred Stock C, Liquidation Preference, Value Value of the difference between preference in liquidation and the par or stated values of the preferred C shares. Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Common Stock, Shares, Outstanding Quarterly Financial Information Disclosure [Abstract] Interest income Interest expense Net interest income Noninterest Income [Abstract] (Loss) gain on derivative instruments and other securities, net Weighted Average Number of Shares Outstanding, Diluted Earnings Per Share, Basic Total other (loss) income, net General and administrative expenses Total expenses Dividend on preferred stock Net income (loss) available (attributable) to common shareholders Weighted Average Number of Shares Outstanding, Basic Other comprehensive (loss) income Comprehensive (loss) income Comprehensive (loss) income (attributable) available to common shareholders Earnings Per Share, Basic and Diluted Earnings Per Share, Basic and Diluted Noninterest Expense [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Comprehensive income per share - basic and diluted Comprehensive income per share - basic and diluted Comprehensive income per share - basic and diluted Major Types of Trading Securities and Assets [Domain] Greater Than Five Years [Member] Greater Than Five Years [Member] Greater Than Five Years [Member] Fair Value Available For Sale Securities Weighted Average Life Fair Value This item represents the weighted average life of available-for-sale agency securities by fair value. Amortized Cost Available For Sale Securities Weighted Average Life Amortized Cost This item represents the weighted average life of available-for-sale agency securities by amortized cost. Agency securities classified as available for sale, Fair value Available-for-sale Securities Agency securities classified as available for sale, Amortized cost Weighted Average Coupon Available For Sale Securities Weighted Average Life Coupon Rate This item represents the weighted average life of available-for-sale agency securities by weighted average coupon rate. Weighted Average Yield Available For Sale Securities Weighted Average Life yield Available For Sale Securities Weighted Average Life yield Investment Securities Investment In Mortgage-Backed Securities [Text Block] Tabular disclosure of investment in mortgage-backed securities which consist of both securities for which the principal and interest payments are guaranteed by government-sponsored entities ("GSEs") and AAA rated non-agency Securities for which the principal and interest payments are not guaranteed by a GSE. Mortgage backed securities include securities remeasured at fair value through earnings and available-for-sale securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Goodwill Goodwill Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill) Pledged Assets Pledged Assets [Text Block] Pledged Assets [Text Block] Net Income (Loss) Per Common Share [Abstract] Net Income (Loss) Per Common Share [Abstract] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Earnings Per Share [Text Block] Earnings Per Share [Text Block] Schedule of Dividends Declared [Abstract] Schedule of Dividends Declared [Abstract] Bermudan [Member] Bermudan [Member] Bermudan Swaption [Member] Derivatives by Maturity [Domain] Cost Fair Value Average Months to Expiration Derivative Liability, Notional Amount Average Receive Rate (LIBOR) Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units Net Income (Loss) Available to Common Stockholders, Basic Earnings Per Share, Diluted Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Statement of Financial Position [Abstract] Assets: Assets [Abstract] Agency securities, at fair value (including pledged securities of $78,619 and $53,055, respectively) Agency securities transferred to consolidated variable interest entities, at fair value (pledged securities) Credit risk transfer securities, at fair value (including pledged securities of $141 and $0, respectively) Non-Agency securities, at fair value (including pledged securities of $45 and $0, respectively) U.S. Treasury securities, at fair value REIT equity securities, at fair value Cash and cash equivalents Derivative assets, at fair value Receivable for investment securities sold (pledged securities) Other Receivables from Broker-Dealers and Clearing Organizations Receivable under reverse repurchase agreements Goodwill and other intangible assets, net Intangible Assets, Net (Including Goodwill) Other assets Other Assets Total assets Assets Liabilities: Liabilities [Abstract] Payable for investment securities purchased Payables to Broker-Dealers and Clearing Organizations Derivative liabilities, at fair value Dividends payable Dividends Payable Accounts payable and other liabilities Accounts Payable and Accrued Liabilities Total liabilities Liabilities Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] 7.750% Series B Cumulative Redeemable Preferred Stock (aggregate liquidation preference of $175) Preferred Stock B, Value, Issued Aggregate par or stated value of issued nonredeemable preferred B stock (or preferred stock B redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. 7.000% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock (aggregate liquidation preference of $325) Preferred Stock C, Value, Issued Aggregate par or stated value of issued nonredeemable preferred C stock (or preferred stock C redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. Common stock - $0.01 par value; 900 and 600 shares authorized, respectively; 536.3 and 391.3 shares issued and outstanding, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity Basis of Presentation and Significant Accounting Policies [Text Block] Basis of Presentation and Significant Accounting Policies [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Goodwill and Intangible Assets, Policy [Policy Text Block] Goodwill and Intangible Assets, Policy [Policy Text Block] Reverse Repurchase Agreements Policy [Policy Text Block] Reverse Repurchase Agreements Policy [Policy Text Block] Reverse Repurchase Agreements Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] Variable Interest Entity Disclosure [Text Block] Variable Interest Entity Disclosure [Text Block] Use of Estimates, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Comprehensive Income, Policy [Policy Text Block] Comprehensive Income, Policy [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Investment Securities Interest Income Repurchase and Resale Agreements Policy [Policy Text Block] Repurchase and Resale Agreements Policy [Policy Text Block] Derivative Instruments Contingencies Disclosure [Text Block] Contingencies Disclosure [Text Block] Measurement Frequency [Axis] Fair Value Hierarchy and NAV [Domain] Derivative asset, fair value Derivative liability, fair value Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value Derivative Liability U.S. Treasury Securities - short Financial Instruments Sold, Not yet Purchased, US Government and Agency Obligations Total - (short)/long, net Quarterly Results Quarterly Financial Information [Text Block] Subsequent Event Subsequent Events [Text Block]