Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] TBA securities Fifteen Year and Thirty Year Securities [Member] TBA securities Fifteen Year and Thirty Year Securities [Member] TBA securities [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 Only And Principal Only Strip [Member] Interest Only And Principal Only Strip [Member] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Agency Securities [Member] Agency Securities [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [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 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 Unrealized Gain (Loss) on Securities 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 Gain Loss on Other Debt Gain Loss on Other 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 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] 7 to 9 months [Member] 7 to 9 months [Member] 7 to 9 months [Member] 13 Months [Member] 13 Months [Member] 13 Months 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 FHLB Weighted Average Days to Maturity FHLB Weighted Average Days to Maturity FHLB Weighted Average Days to Maturity Advances from Federal Home Loan Banks Advances from Federal Home Loan Banks Pledged Assets [Abstract] Pledged Assets [Abstract] 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] 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] 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 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] Interest Rate Swap [Member] Interest Rate Swap [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. 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. Statement of Financial Position [Abstract] Assets: Assets [Abstract] Agency securities, at fair value (including pledged securities of $48,344 and $48,380, 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 Non-agency securities, at fair value (pledged securities) Non-Agency Securities, at Fair Value Non-Agency Securities, at Fair Value U.S. Treasury securities, at fair value (pledged securities) 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 Cash and Cash Equivalents, at Carrying Value Restricted cash and cash equivalents Restricted Cash and Cash Equivalents Derivative assets, at fair value Derivative Asset 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 Federal Home Loan Bank advances Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances Debt of consolidated variable interest entities, at fair value Payable for securities purchased Payables to Broker-Dealers and Clearing Organizations Derivative liabilities, at fair value Derivative Liability Dividends payable Dividends Payable 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 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) Preferred Stock, Value, Issued Common stock - $0.01 par value; 600.0 shares authorized; 331.0 and 337.5 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 (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Equity [Abstract] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Hedging Designation [Axis] Hedging Designation [Domain] Not Designated as Hedging Instrument [Member] 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] 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] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] 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] Statement [Line Items] Statement [Line Items] 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 Major Types of Debt and Equity Securities [Domain] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Beginning OCI Balance Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Unrealized Gains and (Losses), Net Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Reversal of Unrealized (Gains) and Losses, Net on Realization 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 Guarantor Obligations by Underlying Asset Class [Axis] Underlying Asset Class [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Available-for-sale Securities [Member] Available-for-sale Securities [Member] Unrealized Gain (Loss) on Securities Agency MBS sold, at cost Cost Of Sale Of Available For Sale Secuities CostOfSaleOfAvailableForSaleSecuities Proceeds from agency MBS sold Proceeds from Sale of Available-for-sale Securities Net gain (loss) on sale of MBS Gain (Loss) on Sales of Mortgage Backed Securities (MBS) Gross gain on sale of MBS Marketable Securities, Realized Gain (Loss) Gross loss on sale of MBS Available-for-sale Securities, Gross Realized Losses Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 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 Remaining amount authorized for repurchase Stock Repurchase Program, Remaining Authorized Repurchase Amount 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] 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] Position [Axis] Position [Axis] Position [Domain] Position [Domain] Short [Member] Short [Member] Derivatives By Maturity [Axis] Derivatives By Maturity [Axis] Derivatives By Maturity [Axis] Derivatives by Maturity [Domain] Derivatives by Maturity [Domain] Derivatives by Maturity [Domain] 10 Year Maturity [Member] 10 Year Maturity [Member] 10 Year Maturity [Member] 5 Year Maturity [Member] 5 Year Maturity [Member] 5 Year Maturity [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] 7 Years Maturity [Member] 7 Years Maturity [Member] 7 Years Maturity [Member] Future [Member] Future [Member] 15 Year Maturity [Member] 15 Year Maturity [Member] 15 Year Maturity [Member] At Par Value [Member] At Par Value [Member] At Par Value [Member] US Treasury Securities [Member] US Treasury Securities [Member] TBA and Forward Settling Agency Securities [Member] TBA and Forward Settling Agency Securities [Member] TBA and Forward Settling Agency Securities [Member] Derivative, Notional Amount Derivative, Notional Amount Derivative, Forward Settlement Value Derivative, Forward Settlement Value 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 Derivative and Other Hedging Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Subsequent Events [Abstract] 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] Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Cash Acquired from Acquisition Cash Acquired from Acquisition Business Combination, Acquisition Related Costs Business Combination, Acquisition Related Costs Dividends declared per common share Common Stock, Dividends, Per Share, Declared 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 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 Long [Member] Long [Member] Hedging Designation [Axis] Hedging Designation [Domain] Not Designated as Hedging Instrument [Member] 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] Interest Rate Swaption [Member] Interest Rate Swaption [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] Receiver Swaption [Member] Receiver Swaption [Member] Receiver Swaption [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 Liability, Notional Amount Derivative Liability, Notional Amount 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 Derivative Liability U.S. Treasury securities U.S. Treasury Securities - short Financial Instruments Sold, Not yet Purchased, US Government and Agency Obligations Total - (short)/long, net 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 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 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 Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 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 Organization, Consolidation and Presentation of Financial Statements [Abstract] 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 Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Domain] 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] Discontinuation of Election to Account for Interest Rate Swaps as Designated Cash Flow Hedges [Member] Net Unrealized Gain (Loss) on Swaps Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge Total Accumulated OCI Balance OCI before reclassifications Amounts reclassified from accumulated OCI Amounts reclassified from accumulated OCI Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Total Accumulated OCI Balance Total Reclass of Other Comprehensive Income Total Reclass of Other Comprehensive Income Interest Rate Swaps Excluding Forward Starting [Member] Interest Rate Swaps Excluding Forward Starting [Member] Interest Rate Swaps Excluding Forward Starting [Member] Other Derivatives [Member] Other Derivatives [Member] Other Derivatives [Member] 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] Derivative Instrument Risk [Axis] Derivative Contract [Domain] Forward Contracts [Member] Forward Contracts [Member] Payer Swaption [Member] Payer Swaption [Member] Payer Swaption [Member] Weighted Average Forward Start Date Weighted Average Forward Start Date Weighted Average Forward Start Date Cost Options At Cost Options At Cost Fair Value Interest Rate Derivatives, at Fair Value, Net 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 Average Fixed Pay Rate Derivative, Average Fixed Interest Rate Average Receive Rate (LIBOR) Interest Rate Derivative Not Designated As Hedging Instruments Receive Rate Interest Rate Derivative Not Designated As Hedging Instruments Receive Rate Average Maturity (Years) Derivative, Average Remaining Maturity Fair Value Disclosures [Abstract] 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] Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] 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] 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] 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] Debt Security [Axis] Debt Security [Axis] Major Types of Debt Securities [Domain] Major Types of Debt Securities [Domain] Maturity Overnight [Member] Maturity Overnight [Member] Assets Sold under Agreements to Repurchase [Line Items] Assets Sold under Agreements to Repurchase [Line Items] Derivative, Forward Settlement Value 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 Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] US Treasury Securities [Member] 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] 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 Non-Agency Securities, at Fair Value TBA securities Derivative Liability Total assets Assets, Fair Value Disclosure Interest rate swaps Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure 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] Mortgage-backed Securities, Issued by Private Enterprises [Member] Mortgage-backed Securities, Issued by Private Enterprises [Member] Eligible Item or Group for Fair Value Option [Axis] Financial Instrument [Axis] Fair Value, Option, Eligible Item or Group [Domain] Financial Instruments [Domain] 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] MBS, par value 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 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 MBS measured at fair value through earnings Interest Rate Derivative Assets, at Fair Value Total agency MBS, at fair value Total Agency Securities Represents total investment in agency securities at fair value. Weighted average coupon Debt, Weighted Average Interest Rate Weighted average yield Weighted Average Yield Percentage WeightedAverageYieldPercentage 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 Non-Agency Securities Unrealized Gain Non-Agency Securities Unrealized Gain Non-Agency Securities Unrealized Gain Non-Agency Securities Unrealized Loss Non-Agency Securities Unrealized Loss Non-Agency Securities Unrealized Loss Trading Securities, Other Trading Securities, Other Mortgage Backed Securities Amortized Cost Mortgage Backed Securities Amortized Cost Mortgage Backed Securities Amortized Cost Mortgage Backed Securities Unrealized Gain Mortgage Backed Securities Unrealized Gain Mortgage Backed Securities Unrealized Gain Mortgage Backed Securities Unrealized Loss Mortgage Backed Securities Unrealized Loss Mortgage Backed Securities Unrealized Loss Gain Loss on Other Debt Unrealized gain on derivative instruments, net 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 Cash Flow Hedges Derivative Instruments Not Designated As Hedging Instruments Average Months To Expiration Notional Amount Gain (loss) on REIT Equity Securities Gain (loss) on REIT Equity Securities Gain (loss) on REIT Equity Securities Derivative, Average Fixed Interest Rate Interest Rate Derivatives, at Fair Value, Net Options At Cost Interest Rate Derivative Not Designated As Hedging Instruments Receive Rate Required Annual Distribution of Taxable Net Income Pledged Assets Pledged Assets [Text Block] Pledged Assets [Text Block] 30 Days or Less [Member] 1 to 3 Months 3 to 6 Months 4 to 6 Months [Member] 4 to 6 Months [Member] 6 to 9 Months 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 Weighted Average Interest Rate Short-term Debt, Weighted Average Interest Rate 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] 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] Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] 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] Investment Securities Class [Axis] Investment Securities Class [Axis] Investment Securities Class [Domain] Investment Securities Class [Domain] 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] AAA Non-Agency Mortgage-Backed Securities [Member] AAA Non-Agency Mortgage-Backed Securities [Member] AAA rated Non-Agency Mortgage-Backed Securities [Member] Derivative [Member] Derivative [Member] 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 Federal Home Loan Bank Stock Federal Home Loan Bank Stock Available-for-sale Securities Pledged as Collateral Available-for-sale Securities Pledged as Collateral Accrued interest on pledged securities Available For Sale Securities Pledged As Collateral Accrued Interest AvailableForSaleSecuritiesPledgedAsCollateralAccruedInterest 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 Other derivative instruments [Member] Interest Only And Principal Only Strip [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 Additions Settlement, Expirations or Exercise Notional Amount Amount Gain/(Loss) Recognized in Income on Derivatives 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] Retained Interests in Consolidated VIE's Pledged as Collateral Under Repo 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. 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 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 Proceeds from Issuance of Preferred Stock and Preference 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 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) Attributable to Parent Net Income (Loss) Attributable to Parent 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 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 Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, De-Designated Interest Rate Swaps 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 and diluted (shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Net income (loss) per common share - basic and diluted Earnings Per Share, Basic and Diluted 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] 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 Assets Pledged to Us [Member] Assets Pledged to Us [Member] Assets Pledged to Us [Member] Obligation to Return Securities Borrowed Under Reverse Repurchase Agreements at Fair Value Restricted Cash and Cash Equivalents Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) 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 Stock based compensation Share-based Compensation Gain on sale of mortgage-backed securities, net 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 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 mortgage-backed securities Payments to Acquire Mortgage Backed Securities (MBS) categorized as Available-for-sale Proceeds from sale of mortgage-backed securities Proceeds from Sale of Mortgage Backed Securities (MBS) categorized as Available-for-sale Principal collections on 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. Purchases of U.S. Treasury securities Payments to Acquire Available-for-sale Securities Proceeds from sale of U.S. Treasury securities Net proceeds from (payments on) reverse repurchase agreements Proceeds from (Payments for) Securities Purchased under Agreements to Resell Net payments on 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 and cash equivalents Increase (Decrease) in Restricted Cash Other investing cash flows, net Payments for (Proceeds from) Other Investing Activities Net cash provided by (used in) 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 Federal Home Loan Bank Advances Payments on Federal Home Loan Bank advances Repayments of Federal Home Loan Bank Borrowings Payments on debt of consolidated variable interest entities Repayments of Other Debt Payments for common stock repurchases 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 end of period Investment Securities Interest Income Derivative Instruments 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 Payments for Repurchase of Common Stock Preferred dividends declared Dividends, Preferred Stock, Cash Common dividends declared Dividends, Common Stock, Cash Balance, value Balance, Preferred Stock, shares Balance, Common Stock, shares 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] 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] Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] Federal National Mortgage Association Certificates and Obligations (FNMA) [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] Cost Basis Net long TBA position, at fair value 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, Value Preferred Stock, Liquidation Preference, Value 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 Subsequent Event Subsequent Events [Text Block] Risk of interest swap and swaption agreements to stockholders' equity Credit Derivative, Maximum Exposure, Undiscounted Quarterly Financial Information Disclosure [Abstract] Unaudited Interim Consolidated Financial Statements Quarterly Financial Information [Text Block] 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 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. Total agency MBS, at fair value Fair Value Measurements Fair Value Disclosures [Text Block]