Disclosure of Repurchase Agreements [Abstract] Schedule of Assets Sold under Agreements to Repurchase [Table] Schedule of Assets Sold under Agreements to Repurchase [Table] Debt Security [Axis] Debt Security [Axis] Major Types of Debt Securities [Domain] Major Types of Debt Securities [Domain] US Treasury Securities [Member] US Treasury Securities [Member] Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] Agency Securities [Member] Agency Securities [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Repurchase Agreements [Member] Repurchase Agreements [Member] Assets Sold under Agreements to Repurchase, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Assets Sold under Agreements to Repurchase, Maturity Period [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] 30 Days or Less [Member] Maturity Less than 30 Days [Member] 1 to 3 Months thirty one to ninety [Member] thirty one to ninety [Member] 3 to 6 Months 4 to 6 Months [Member] 4 to 6 Months [Member] 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 37 to 48 months [Member] 37 to 48 months [Member] 48 to 60 Months 49 to 60 Months [Member] 49 to 60 Months [Member] Statement [Line Items] Statement [Line Items] Short-term Debt, Fair Value Short-term Debt, Fair Value Derivative, Forward Settlement Value Derivative, Forward Settlement Value Derivative, Forward Settlement Value Repurchase Agreements 1 Securities Sold under Agreements to Repurchase Weighted Average Interest Rate Short-term Debt, Weighted Average Interest Rate Weighted Average Days to Maturity Repurchase Agreements Weighted Average Days To Maturity Repurchase Agreements Weighted Average Days To Maturity Short-term Debt, Percentage Bearing Fixed Interest Rate Short-term Debt, Percentage Bearing Fixed Interest Rate Short-term Debt, Terms Short-term Debt, Terms Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] 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, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Receiver Swaption [Member] Receiver Swaption [Member] Receiver Swaption [Member] Payer Swaption [Member] Payer Swaption [Member] Payer Swaption [Member] Future [Member] Future [Member] Put Option [Member] Put Option [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] 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] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Only And Principal Only Strip [Member] Interest Rate Swaps [Member] Interest Rate Swaps [Member] Interest Rate Swaps [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] Put Option [Member] 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 Trading Securities Trading Securities 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 Unrealized Gain (Loss) on Securities Unrealized Gain (Loss) on Securities Gain (loss) on REIT Equity Securities Gain (loss) on REIT Equity Securities Gain (loss) on REIT Equity Securities Gain Loss on Other Debt Gain Loss on Other Debt Gain Loss on Other Debt Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Net Income (Loss) Attributable to Parent 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 agency securities premiums and discounts, 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 (Gain) loss on sale of agency securities, net Gain (Loss) on Sales of Mortgage Backed Securities (MBS) Loss on derivative instruments and other securities, net Loss On Derivative Instruments And Trading Securities Net Loss on derivative instruments and trading securities, net Decrease in other assets Increase (Decrease) in Other Operating Assets (Decrease) increase in accounts payable and other accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Accretion of discounts on debt of consolidated variable interest entities Amortization of Debt Discount (Premium) 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 securities Payments to Acquire Mortgage Backed Securities (MBS) categorized as Available-for-sale Proceeds from sale of agency securities Proceeds from Sale of Mortgage Backed Securities (MBS) categorized as Available-for-sale Principal collections on agency 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. Purchases of U.S. Treasury securities Payments to Acquire Available-for-sale Securities Proceeds from sale of U.S. Treasury securities Proceeds from Sale of Available-for-sale Securities Net proceeds from (payments on) reverse repurchase agreements Proceeds from (Payments for) Securities Purchased under Agreements to Resell Net (payments on) proceeds from other derivative instruments Payments for (Proceeds from) Derivative Instrument, Financing Activities Purchases of REIT equity securities Payments to Acquire Marketable Securities Proceeds from sale of REIT equity securities Proceeds from Sale and Maturity of Marketable Securities Increase in restricted cash Increase (Decrease) in Restricted Cash Other investing cash flows, net 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, net Proceeds from Short-term Debt Repayments on repurchase agreements Repayments of Short-term Debt Repayments on debt of consolidated variable interest entities Repayments of Other Debt Proceeds from Issuance of Preferred Stock and Preference Stock Proceeds from Issuance of Preferred Stock and Preference Stock Payments made on common stock repurchases Payments for Repurchase of Common Stock Cash dividends paid Payments of Dividends Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Pledged Assets [Abstract] Pledged Assets [Abstract] Pledged Assets Pledged Assets [Text Block] Pledged Assets [Text Block] Risk of repurchase agreement to stockholders' equity Risk Of Repurchase Agreement To Stockholders Equity Risk Of Repurchase Agreement To Stockholders Equity Risk of interest swap and swaption agreements to stockholders' equity Credit Derivative, Maximum Exposure, Undiscounted 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] Schedule of Securities and Cash Pledged as Collateral from Counterparties 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] Offsetting Assets and Liabilities Offsetting Assets [Table Text Block] Offsetting Liabilities Offsetting Liabilities [Table Text Block] Offsetting Assets and Liabilities [Table] Offsetting Assets and Liabilities [Table] Offsetting Assets and Liabilities [Table] 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] Reverse Repurchase Agreements [Member] Reverse Repurchase Agreements [Member] Reverse Repurchase Agreements [Member] Assets Pledged to Us [Member] Assets Pledged to Us [Member] Assets Pledged to Us [Member] Offsetting Assets and Liabilities [Line Items] Offsetting Assets and Liabilities [Line Items] [Line Items] for Offsetting Assets and Liabilities [Table] Available-for-sale Securities Pledged as Collateral Available-for-sale Securities Pledged as Collateral 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 Securities Pledged Restricted Cash and Securities Pledged Restricted Cash and Securities Pledged Restricted Cash and Cash Equivalents Restricted Cash and Cash Equivalents 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] Accrued interest on pledged securities Available For Sale Securities Pledged As Collateral Accrued Interest AvailableForSaleSecuritiesPledgedAsCollateralAccruedInterest Restricted cash 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 Derivative and Other Hedging Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative [Line Items] Derivative [Line Items] 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] 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] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Assets [Member] Assets [Member] Liability [Member] Liability [Member] Swaption [Member] Swaption [Member] 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. 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. Repurchase Agreements And Other Debt Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Investments, Debt and Equity Securities [Abstract] Schedule of Trading Securities and Other Trading Assets [Table] Trading Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Trading Securities and Assets [Domain] Major Types of Debt and Equity Securities [Domain] 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 [Member] Greater Than Five Years [Member] Greater Than Five Years [Member] Greater Than Ten Years [Member] Greater Than Ten Years [Member] Greater Than Ten 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 Available-for-sale Securities, Amortized Cost Basis 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, Policy [Policy Text Block] Interest Income Interest Income [Policy Text Block] Interest Income [Policy Text Block] Derivative Instruments Derivatives, Policy [Policy Text Block] Forward Contracts [Member] Forward Contracts [Member] Derivative Position [Axis] Derivative Position [Axis] Derivative Position [Axis] Derivative Position [Domain] Derivative Position [Domain] Derivative Position [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] Derivative Contract [Domain] Unrealized gain on derivative instruments, net Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Net periodic interest costs on swaps Net Periodic Interest Rate Costs on Swaps Net Periodic Interest Rate Costs on Swaps Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion Net Unrealized Gain (Loss) on Swaps Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge Average Maturity (Years) Derivative, Average Remaining Maturity Deferred loss expected to be reclassified from OCI into interest expense over the next twelve months Deferred gain loss discontinued interest rate swap expected to be reclassified from OCI to interest expense next twelve months Deferred gain loss discontinued interest rate swap expected to be reclassified from OCI to interest expense 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, Average Fixed Interest Rate Derivative, Average Fixed Interest Rate Interest Rate Derivatives, at Fair Value, Net Interest Rate Derivatives, at Fair Value, Net Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, De-Designated Interest Rate Swaps 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 Equity [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] 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] Major Types of Debt and Equity Securities [Domain] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Beginning OCI Balance Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Total Accumulated OCI Balance Accumulated Other Comprehensive Income (Loss), Net of Tax OCI before reclassifications Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of 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 Amounts reclassified from accumulated OCI Total Accumulated OCI Balance Total Reclass of Other Comprehensive Income Total Reclass of Other Comprehensive Income Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] TBA securities Fifteen Year and Thirty Year Securities [Member] TBA securities Fifteen Year and Thirty Year Securities [Member] TBA securities [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Total agency MBS, at fair value Total Agency Securities Represents total investment in agency securities at fair value. Net long TBA position, at fair value Derivative Asset, Fair Value, Gross Asset TBA, net carrying value Derivative, Fair Value, Net Unamortized premium balance Debt Instrument, Unamortized Discount (Premium), Net Weighted average expected constant prepayment rate Future Prepayment Rate Assumption Of Investment Portfolio Average future constant repayment rate assumption of Investment Portfolio. Weighted average life of interest-only strips Weighted Average Life Interest Only Securities Weighted Average Life Interest Only Securities Weighted average life of principal-only strips Weighted Average Life Principal Only Securities Weighted Average Life Principal Only Securities Net unrealized gain Agency securities, total fair value Securities Held as Collateral, at Fair Value Debt, at fair value Other Long-term Debt Principal balance of agency securities collaterizing debt issued by securitization trust Principal Balance of Securities Held as Collateral Principal Balance of Securities Held as Collateral Principal amount Debt Instrument, Face Amount Gain (loss) associated with consolidated debt 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 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 Investments [Table] Schedule of Investments [Table] Fannie Mae [Member] Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] Freddie Mac [Member] Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] Ginnie Mae [Member] Government National Mortgage Association Certificates and Obligations (GNMA) [Member] Eligible Item or Group for Fair Value Option [Axis] Eligible Item or Group for Fair Value Option [Axis] Fair Value, Option, Eligible Item or Group [Domain] Fair Value, Option, Eligible Item or Group [Domain] Available-for-sale Securities [Member] Available-for-sale Securities [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] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Agency MBS, par Available For Sale Securities Par Available For Sale Securities Par Unamortized discount Debt Instrument, Unamortized Discount Unamortized premium Debt Instrument, Unamortized Premium Amortized 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 agency MBS, at fair value Available-for-sale Securities, Debt Securities Interest-only and principal-only strips, amortized cost Interest Rate Derivative Assets at Amortized Cost Interest Rate Derivative Assets at Amortized Cost Gross unrealized gains Unrealized Gain on Derivatives Unrealized Gain on Derivatives Gross unrealized losses Unrealized Loss on Derivatives Unrealized Loss on Derivatives Total agency MBS remeasured at fair value through earnings Interest Rate Derivative Assets, at Fair Value Total agency MBS, at fair value Weighted average coupon Debt, Weighted Average Interest Rate Weighted average yield Weighted Average Yield Percentage WeightedAverageYieldPercentage Weighted average yield for the year ended Weighted Average Yield Percentage for Period Weighted Average Yield Percentage Year Ended Unamortized Principal Balance Of Interest Only Strips Unamortized Principal Balance Of Interest Only Strips Unamortized Principal Balance Of Interest Only Strips Weighted Average Contractual Interest Rate Of Interest Only Strips Weighted Average Contractual Interest Rate Of Interest Only Strips Weighted Average Contractual Interest Rate Of Interest Only Strips Unamortized Principal Balance Of Principal Only Strips Unamortized Principal Balance Of Principal Only Strips Unamortized principal balance of principal only strips Future Prepayment Rate Assumption Of Investment Portfolio Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] 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 Remaining amount authorized for repurchase Stock Repurchase Program, Remaining Authorized Repurchase Amount Statement of Financial Position [Abstract] Assets: Assets [Abstract] Agency securities, at fair value (including pledged securities of $48,128 and $51,629, respectively) Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value Agency securities transferred to consolidated variable interest entities, at fair value (pledged securities) Variable Interest Entity, Consolidated, Carrying Amount, Assets U.S. Treasury securities, at fair value (including pledged securities of $4,756 and $2,375, respectively) Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value REIT equity securities, at fair value Marketable Securities, Equity Securities Cash and cash equivalents Derivative assets, at fair value Derivative Asset Receivable for securities sold (including pledged securities of $221 and $79, respectively) Receivables from Brokers-Dealers and Clearing Organizations Receivable under reverse repurchase agreements Receivable Under Reverse Repurchase Agreements Receivable Under Reverse Repurchase Agreements Other assets Other Assets Total assets Assets Liabilities: Liabilities [Abstract] Repurchase agreements Debt of consolidated variable interest entities, at fair value Payable for agency securities purchased Payables to Broker-Dealers and Clearing Organizations Derivative liabilities, at fair value Derivative Liability Dividend payable Dividends Payable Obligation to return securities borrowed under reverse repurchase agreements, at fair value Accounts payable and other accrued liabilities Accounts Payable and Accrued Liabilities Total liabilities Liabilities Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock - $0.01 par value; 10.0 shares authorized: Redeemable Preferred Stock; $0.01 par value; 6.9 shares issued and outstanding (aggregate liquidation preference of $348 and $173, respectively) Preferred Stock, Value, Issued Common stock - $0.01 par value; 600.0 shares authorized; 352.8 and 356.2 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 income Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity 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 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] 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 Net Estimated Fair Value Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net Derivative, Notional Amount Derivative, Notional Amount Derivative, Higher Remaining Maturity Range Derivative, Higher Remaining Maturity Range Subsequent Events [Abstract] Subsequent Event Subsequent Events [Text Block] 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] 15 Year Maturity [Member] 15 Year Maturity [Member] 15 Year Maturity [Member] 30 Year Maturity [Member] 30 Year Maturity [Member] 30 Year Maturity [Member] Cost Basis Derivatives by Maturity [Domain] Cost Fair Value Average Months to Expiration Derivative Liability, Notional Amount Average Receive Rate (LIBOR) Description of variable rate basis Debt Instrument, Description of Variable Rate Basis Basis spread over LIBOR Spread Over LIBOR Spread Over LIBOR Weighted average life of other debt Weighted Average Life Other Debt Weighted Average Life Other Debt Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Income Statement [Abstract] 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 income, net: Noninterest Income [Abstract] Gain (loss) on sale of agency securities, 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 Total other income, net Noninterest Income Expenses: Noninterest Expense [Abstract] Management fees Management Fee Expense General and administrative expenses General and Administrative Expense Total expenses Operating Expenses Net income (loss) Dividend on preferred stock Preferred Stock Dividends, Income Statement Impact Net income (loss) available (attributable) to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized Gains and (Losses), Net Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive (loss) income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive (loss) income (attributable) available to common stockholders Comprehensive income available to common shareholders Comprehensive income available to common shareholders Weighted average number of common shares outstanding-basic and diluted (shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Net loss per common share - basic and diluted (dollars per share) Earnings Per Share, Basic and Diluted Comprehensive income per common share - basic and diluted Comprehensive income per share - basic and diluted Comprehensive income per share - basic and diluted Dividends declared per common share Common Stock, Dividends, Per Share, Declared Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Information [Text Block] Quarterly Financial Information [Text Block] 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] Other Assets [Member] Other Liabilities [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Derivative asset, fair value Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Derivative liability, fair value Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value U.S. Treasury securities U.S. Treasury Securities - short Financial Instruments Sold, Not yet Purchased, US Government and Agency Obligations Total - (short)/long, net government bonds owned and sold short net government bonds owned and sold short net Proceeds from Securities Purchased under Agreements to Resell Proceeds from Securities Purchased under Agreements to Resell 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 Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Required distribution of taxable net income on a annual basis Required Annual Distribution of Taxable Net Income Required Annual Distribution of Taxable Net Income Intended annual distribution of taxable net income Intended Annual Distribution of Taxable Net Income Intended Annual Distribution of Taxable Net Income Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum [Member] Maximum [Member] Term of derivative contract Derivative, Term of Contract Components of Investment Securities Components of Investment Securities [Table Text Block] Components of Investment Securities [Table Text Block] Agency Securities Agency Securities [Table Text Block] Agency Securities [Table Text Block] Summary Of Agency Securities Estimated Weighted Average Life Classifications Summary of Agency Securities Estimated Weighted Average Life Classifications [Table Text Block] Summary of Agency Securities Estimated Weighted Average Life Classifications [Table Text Block] Summary of Changes in Accumulated OCI for Agency Securities Summary of Changes in Accumulated OCI for Agency Securitie [Table Text Block] Summary of Changes in Accumulated OCI for Agency Securitie [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 Agency Securities [Table Text Block] Summary of Net Gain from Sale of Agency Securities [Table Text Block] 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] Fair Value Hierarchy [Domain] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] Other Derivatives [Member] 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 Agency securities transferred to consolidated VIEs TBA securities Derivative Liability Total assets Assets, Fair Value Disclosure Interest rate swaps U.S. Treasury futures Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Statement [Table] Statement [Table] Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] 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 Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate 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 Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate 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 Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss Investment Securities Investment In Agency Securities Text Block Tabular disclosure of investment in agency securities which consist of securities for which the principal and interest payments are guaranteed by government-sponsored entities ("GSEs"), such as the Federal National Mortgage Association ("Fannie Mae") and the Federal Home Loan Mortgage Corporation ("Freddie Mac"), or by a U.S. Government agency, such as the Government National Mortgage Association ("Ginnie Mae"). Agency 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. Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] 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] Gross unrealized gain Agency Securities Gross Unrealized Gain This item represents the gross unrealized gains for agency securities, at a point in time. Gross unrealized loss Agency Securities Gross Unrealized Loss Agency Securities Gross Unrealized Loss Fair value Interest-only and principal-only strips, amortized cost Trading Securities, Cost Interest-only and principal-only strips, fair value Trading Securities, Other Total agency MBS, amortized cost Agency Securities Amortized Cost This item represents agency securities by type net of adjustments including accretion, amortization, collection of cash, previous other-than -temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Preferred Class A [Member] Preferred Class A [Member] Series A Preferred Stock [Member] Series A Preferred Stock [Member] Preferred Class B [Member] Preferred Class B [Member] Series B Preferred Stock [Member] Series B Preferred Stock [Member] Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized 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 Preferred Stock Authorized, but not Issued Preferred Stock Authorized, but not Issued Preferred Stock Authorized, but not Issued Sale of Stock, Price Per Share Sale of Stock, Price Per Share Issuance of preferred stock Preferred Stock, Liquidation Preference Per Share Preferred Stock, Liquidation Preference Per Share Preferred Stock, Shares Issued Preferred Stock, Shares Issued Share Price Share Price Preferred Stock, Value, Issued Preferred stock, percent interest per share Preferred Stock, Percent Interest Per Share Preferred Stock, Percent Interest Per Share Securities or Other Assets Sold under Agreements to Repurchase, Maturity Periods [Axis] Maturity up to 30 days [Member] 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] Maturity Overnight [Member] Maturity Overnight [Member] Security Owned and Pledged as Collateral, Fair Value 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. At Par Value [Member] At Par Value [Member] At Par Value [Member] 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] 3 Year Maturity [Member] [Member] 3 Year Maturity [Member] [Member] 3 Year Maturity [Member] [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] 10 Year Maturity [Member] 10 Year Maturity [Member] 10 Year Maturity [Member] U.S. Treasury securities, net 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 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] Balance, value Balance, Preferred Stock, shares Preferred Stock, Shares Outstanding Balance, Common Stock, shares Common Stock, Shares, Outstanding Repurchase of common stock Repurchase of common stock shares Preferred dividends declared Dividends, Preferred Stock, Cash Common dividends declared Dividends, Common Stock, Cash Balance, value Balance, Preferred Stock, shares Balance, Common Stock, shares 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] Trading Securities Pledged as Collateral Trading Securities Pledged as Collateral Assets Pledged included in Receivable for Securities Sold Assets Pledged included in Receivable for Securities Sold Assets Pledged included in Receivable for Securities Sold Preferred Stock, Par or Stated Value Per Share (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred Stock, Shares Outstanding Preferred Stock Liquidation Preference Pref'd Stock Liquidation Preference Pref'd Stock Liquidation Preference Common Stock, Par or Stated Value Per Share (in dollars 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 Document and Entity Information [Abstract] -- None. No documentation exists for this element. -- Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date 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 Current Fiscal Year End Date Current Fiscal Year End Date Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Trading Symbol Trading Symbol Guarantor Obligations by Underlying Asset Class [Axis] Underlying Asset Class [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Agency MBS sold, at cost Cost Of Sale Of Available For Sale Secuities CostOfSaleOfAvailableForSaleSecuities Proceeds from agency MBS sold Net (loss) gain on sale of agency MBS Gross gain on sale of agency MBS Marketable Securities, Realized Gain (Loss) Gross loss on sale of agency MBS Available-for-sale Securities, Gross Realized Losses