Accounting Policies [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Other Swap [Member] Other Swap [Member] Other Swap [Member] 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] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Interest Rate Derivative Not Designated As Hedging Instruments Average receive Rate Interest Rate Derivative Not Designated As Hedging Instruments Average receive Rate Interest Rate Derivative Not Designated As Hedging Instruments Average receive Rate Unrealized (loss) gain on derivative instruments, net Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Interest Payment on Swaps, Gross Interest Payment on Swaps, Gross Interest Payment on Swaps, Gross Gain (Loss) from Hedged Firm Commitment Not Qualifying as Interest Rate Fair Value Hedge, Net Gain (Loss) from Hedged Firm Commitment Not Qualifying as Interest Rate Fair Value Hedge, Net Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments Derivative Instruments, Gain (Loss) Recognized in Income, Net Derivative Instruments, Gain (Loss) Recognized in Income, Net Deferred Loss on Discontinuation of Interest Rate Fair Value Hedge Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge Deferred 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 next twelve months Deferred gain loss discontinued interest rate swap expected to be reclassified from OCI to interest expense OTTI charges on agency securities Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Derivative, Average Remaining Maturity Derivative, Average Remaining Maturity Derivative Asset, Fair Value, Net [Abstract] Derivative [Table] Derivative [Table] 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] 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] Put Option [Member] Put Option [Member] Payer Interest Rate Swaps [Member] Interest Rate Swaps [Member] Interest Rate Swaps [Member] Receiver Interest Rate Swaps [Member] Receiver Interest Rate Swaps [Member] Receiver Interest Rate Swaps [Member] Payer Swaption [Member] Payer Swaption [Member] Payer Swaption [Member] Receiver Swaption [Member] Receiver Swaption [Member] Receiver Swaption [Member] Short Sales Of U S Government Securities [Member] Short Sales Of U S Government Securities [Member] Short Sales Of U S Government Securities [Member] Treasury Futures [Member] Treasury Futures [Member] Treasury Futures [Member] Treasury Futures Short [Member] Treasury Futures Short [Member] Treasury Futures Short [Member] Markit IOS Total Return Swaps - Long [Member] Markit IOS Total Return Swaps - Long [Member] Markit IOS Total Return Swaps - Long [Member] Markit IOS Total Return Swaps - Short [Member] Markit IOS Total Return Swaps - Short [Member] Markit IOS Total Return Swaps - Short [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] Statement [Line Items] Statement [Line Items] Unrealized Gain On Derivative Instrument And Trading Securities Unrealized Gain On Derivative Instrument And Trading Securities Unrealized Gain On Derivative Instrument And Trading Securities Notional Amount Notional Amount of Other Derivatives Not Designated as Hedging Instruments 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 Additions Due to Hedge De-Designations Notional Amount Of Derivatives Not Designated As Hedging Instruments additions due to Hedge De-Designations Notional Amount Of Derivatives Not Designated As Hedging Instruments additions due to Hedge De-Designations 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 Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Hedging Designation [Axis] Hedging Designation [Domain] Not Designated as Hedging Instrument [Member] Derivative [Line Items] Derivative [Line Items] Schedule of Interest Rate Swaption Agreements Outstandin [Table Text Block] Schedule of Interest Rate Swaption Agreements Outstandin [Table Text Block] Schedule of Interest Rate Swaption Agreements Outstandin [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] Summary of Outstanding Interest Rate Swaps Designated as Hedging Instruments Schedule Of Outstanding Interest Rate Swap Designated As Hedging Instruments [Table Text Block] Schedule Of Outstanding Interest Rate Swap Designated As Hedging Instruments [Table Text Block] Summary of Outstanding Forward Contracts Designated as Hedging Instruments Schedule Of Outstanding Forward Contracts Designated As Hedging Instruments [Table Text Block] Schedule Of Outstanding Forward Contracts Designated As Hedging Instruments [Table Text Block] Effect of Interest Rate Swaps Designated as Hedges Schedule of Effect Forward Contracts Designated as Hedges [Table Text Block] Schedule of Effect Forward Contracts Designated as Hedges [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 Effect Interest Rate Swaps Designated As Hedges Schedule Of Effect Interest Rate Swaps Designated As Hedges [Table Text Block] Schedule Of Effect Interest Rate Swaps Designated As Hedges [Table Text Block] 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 Outstanding Derivatives Not Designated as Hedging Instruments [Table Text Block] Available-for-sale Securities [Abstract] Agency Securities [Table Text Block] 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 Text Block Summary Of Agency Securities Estimated Weighted Average Life Classifications Text Block Summary Of Agency Securities Pledged As Collateral Under Repurchase Agreements by Remaining Maturity Schedules Of Securities Pledged As Collateral Under Repurchase Agreement [Text Block] Schedules Of Securities Pledged As Collateral Under Repurchase Agreement [Text Block] Schedule of Investments Owned and Pledged as Collateral [Table Text Block] Schedule of Investments Owned and Pledged as Collateral [Table Text Block] Schedule of Investments Owned and Pledged as Collateral [Table Text Block] 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 Changes in Accumulated OCI for Agency Securitie [Table Text Block] Components of Investment Securities [Table Text Block] Components of Investment Securities [Table Text Block] Components of Investment Securities [Table Text Block] 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 Continuous Unrealized Loss Position of Available for Sale Securities [Table Text Block] Summary of Net Gain from Sale of Agency Securities [Table Text Block] Summary of Net Gain from Sale of Agency Securities [Table Text Block] Summary of Net Gain from Sale of Agency Securities [Table Text Block] Stockholders' Equity Note [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value by Measurement Frequency [Axis] Fair Value by Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [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] Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Statement, Scenario [Axis] Statement, Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income 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 on sale of agency securities, net Gain (Loss) on Sales of Mortgage Backed Securities (MBS) Loss (gain) on derivative instruments and other securities, net Loss On Derivative Instruments And Trading Securities Net Loss on derivative instruments and trading securities, net Increase in other assets Increase (Decrease) in Other Operating Assets Increase in accounts payable and other accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of agency 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 Proceeds from U.S. Treasury securities sold prior to purchase Proceeds From U.S. Treasury Securities Sold, Not Yet Purchased Proceeds from U.S. treasury securities sold, not yet purchased Purchase of U.S. Treasury securities sold prior to purchase Payments to Acquire Marketable Securities Proceeds from reverse repurchase agreements Proceeds from (Payments for) Securities Purchased under Agreements to Resell Payments made on reverse repurchase agreements Payments for Securities Purchased under Agreements to Resell Net (payments) receipts on other derivative instruments not designated as qualifying hedges Payments for (Proceeds from) Derivative Instrument, Financing Activities Decrease in restricted cash Increase (Decrease) in Restricted Cash Net cash 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, net Proceeds from Short-term Debt Repayments on other debt Repayments of Other Debt Net proceeds from common stock issuances Proceeds from Issuance of Common Stock Cash dividends paid Payments of Dividends Net cash provided by 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 Stockholders' Equity [Table] Stockholders' Equity [Table] Stockholders' Equity [Table] Statement, Equity Components [Axis] Statement, Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Public offering price per share Sale of Stock, Price Per Share Public offering of common stock Stock Issued During Period, Shares, New Issues Public offering net proceeds Proceed From Issuance of Common Stock, Net of Issuance Costs Proceed From Issuance of Common Stock, Net of Issuance Costs and Discounts Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value by Asset Class [Axis] Fair Value by Asset Class [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] Other derivative instruments [Member] Other Derivatives [Member] Other Derivatives [Member] Fair Value by Liability Class [Axis] Fair Value by Liability Class [Axis] Fair Value, Liabilities, Measured on Recurring Basis, Unobservable Input Reconciliation, by Liability Class [Domain] Fair Value, Liabilities, Measured on Recurring Basis, Unobservable Input Reconciliation, by Liability Class [Domain] Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value Derivative Assets Derivative Assets Assets, Fair Value Disclosure Assets, Fair Value Disclosure 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 Derivative Liabilities Derivative Liabilities Liabilities, Fair Value Disclosure Liabilities, Fair Value Disclosure Transfers between hierarchy levels Transfers Between Hierarchy Levels Transfers between hierarchy levels Disclosure of Repurchase Agreements [Abstract] Repurchase Agreements And Other Debt Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Schedule of Trading Securities and Other Trading Assets [Table] Schedule of Trading Securities and Other Trading Assets [Table] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Agency Securities [Member] Agency Securities [Member] 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 gain (loss) on available-for-sale securities, net Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Reversal of prior Period 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 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] Issuance of Equity [Member] Issuance of Equity [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Preferred stock, shares issued Preferred Stock, Shares Issued Dividends declared per common share Common Stock, Dividends, Per Share, Declared Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Proceeds from Issuance of Preferred Stock and Preference Stock Proceeds from Issuance of Preferred Stock and Preference Stock Preferred Stock, Dividend Rate, Percentage Preferred Stock, Dividend Rate, Percentage Preferred Stock, Liquidation Preference Per Share Preferred Stock, Liquidation Preference Per Share Investment Type [Axis] Investment Type [Axis] Investment Securities Class [Domain] Investment Securities Class [Domain] Repurchase Agreements [Member] Repurchase Agreements [Member] Under Repurchase Agreements [Member] Under Other Debt Agreements [Member] Under Other Debt Agreements [Member] Under Derivative Agreements [Member] Under Derivative Agreements [Member] Under Derivative Agreements [Member] Under Prime Broker Agreements [Member] Under Prime Broker Agreements [Member] Under Prime Broker Agreements [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] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Fannie Mae [Member] Fannie Mae [Member] Fannie Mae [Member] Freddie Mac [Member] Freddie Mac [Member] Ginnie Mae [Member] Ginnie Mae [Member] Treasuries [Member] Treasuries [Member] Treasuries [Member] Fair value Available-for-sale Securities Pledged as Collateral Amortized cost Available For Sale Securities Pledged As Collateral Amortized Cost AvailableForSaleSecuritiesPledgedAsCollateralAmortizedCost Accrued interest on pledged agency securities Available For Sale Securities Pledged As Collateral Accrued Interest AvailableForSaleSecuritiesPledgedAsCollateralAccruedInterest 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 Collateralized Agency Securities Sold But Not Settled Collateralized Agency Securities Sold But Not Settled Agency securities pledged as collateral that were sold but not yet settled. At-the-Market Offering Program [Member] At-the-Market Offering Program [Member] At-the-Market Offering Program [Member] Dividend Reinvestment And Direct Stock Purchase Plan [Member] Dividend Reinvestment And Direct Stock Purchase Plan [Member] Dividend Reinvestment And Direct Stock Purchase Plan [Member] Public offering, average price per share Sale of Stock, Average Offering Price Per Share Sale of Stock, Average Offering Price Per Share Issuance of common stock, value Stock Issued During Period, Value, New Issues Public offering of common stock Shares issued Stock Issued During Period, Shares, Dividend Reinvestment Plan Cash proceeds from shares issued Stock Issued During Period, Value, Dividend Reinvestment Plan Shares available for issuance Common Stock, Capital Shares Reserved for Future Issuance Fair Value, Option, Qualitative Disclosures Related to Election, by Eligible Item or Group [Axis] Fair Value, Option, Qualitative Disclosures Related to Election, by Eligible Item or Group [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 MBS 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] Freddie Mac [Member] Ginnie Mae [Member] Agency MBS, par Available For Sale Securities Par Available For Sale Securities Par Unamortized discount Available For Sale Securities Unamortized Discount Available For Sale Securities Unamortized Discount Unamortized premium Available For Sale Securities Unamortized Premium AvailableForSaleSecuritiesUnamortizedPremium Amortized cost Available-for-sale Securities, Amortized Cost Basis Gross unrealized gains Available-for-sale Securities, Gross Unrealized Gains Gross unrealized losses Available-for-sale Securities, Gross Unrealized Losses 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, at fair value 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 Weighted Average Coupon Rate WeightedAverageCouponRate 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 Unamortized principal balance of principal-only strips Unamortized Principal Balance Of Principal Only Strips Unamortized principal balance of principal 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 Prepayment rate over remaining life of aggregate investment portfolio Prepayment Rate Of Remaining Life Of Investment Portfolio Prepayment Rate Of Remaining Life Of Investment Portfolio Average prepayment rate based on forward rate assumption Future Prepayment Rate Assumption Of Investment Portfolio Average future constant repayment rate assumption of Investment Portfolio. Average reset rate for adjustable rate securities Average Reset Rate For Adjustable Rate Securities Average reset rate for adjustable rate securities. Average underlying index rate on agency securities based on current spot rate Average Underlying Index Rate On Agency Securities Based On Current Spot Rate Average underlying index rate on agency securities based on the current spot rate in effect on the date the securities were acquired. Average Margin on agency securities Average Margin Agency Securities Average Margin on agency securities. TBA securities Fifteen Year and Thirty Year Securities [Member] TBA securities [Member] Forward settling securities Twenty Year Securities and ARMs [Member] Forward settling securities [Member] Purchase [Member] Long Position [Member] Long Position [Member] Sale [Member] Short Position [Member] Short Position [Member] Notional Amount of Derivative Instruments Derivative, Notional Amount Fair Value of Derivative Instruments Derivative, Fair Value, Net Organization [Abstract] Organization (Abstract) Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Hedging Designation [Axis] Hedging Designation [Domain] Derivatives, Fair Value, by Balance Sheet Location [Axis] Derivatives, Fair Value, by Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Amount of Gain or (Loss) Recognized in OCI (Effective Portion) Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Amount of Gain or (Loss) Reclassified from OCI into Earnings (Effective Portion) Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Loss on Cash Flow Hedge Ineffectiveness Loss on Cash Flow Hedge Ineffectiveness Derivative Position [Axis] Derivative Position [Axis] Derivative Position [Domain] Derivative Position [Domain] Total Return Swap [Member] Interest Rate Contract [Member] Interest Rate Contract [Member] Gain On Interest Only Securities Remeasured at Fair Value Through Earnings Gain On Interest Only Securities Remeasured at Fair Value Through Earnings Gain on interest only securities remeasured at fair value through earnings one-month LIBOR term (in years) Interest Rate Swap Term Interest Rate Swap Term Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge Proceeds from sales of treasury securities Proceeds from Securities Purchased under Agreements to Resell Proceeds from sales of treasury securities Loss On Derivative Instruments And Trading Securities Loss On Derivative Instruments And Trading Securities Amortization Period of Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge Amortization Period of Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge Deferred gain loss discontinued interest rate swap expected to be reclassified from OCI to interest expense next twelve months Interest rate swap agreement outstanding not designated as hedge Notional Amount of Interest Rate Derivative Instruments Not Designated as Hedging Instruments Gain on interest only securities remeasured at fair value through earnings Loss on Interest Only Securities Remeasured at Fair Value Through Earnings Loss on interest only securities remeasured at fair value through earnings Loss on interest only securities remeasured at fair value through earnings Loss on cash flow hedge ineffectiveness Gain on trading securities Derivative Index Value Derivative Index Value Derivative Index Value Fair value of interest rate swap, liability position Interest Rate Derivative Liabilities, at Fair Value Agency securities, pledged as collateral against interest rate swap Agency Securities Pledged As Collateral The fair value of agency securities that serve as collateral for borrowings. Restricted Cash Pledged As Collateral Restricted Cash Pledged As Collateral The carrying amount of cash and cash equivalent items which are restricted as to withdrawal or usage that serve as collateral for borrowings. Total agency securities and restricted cash pledged as collateral against interest rate swaps Restricted Cash and Investments Interest rate swap terminated value interest Rate Swap Terminated Value interest Rate Swap Terminated Value Unrealized Gain (Loss) On Derivative Instrument And Trading Securities Unrealized Gain (Loss) On Derivative Instrument And Trading Securities Unrealized Gain (Loss) On Derivative Instrument And Trading Securities Not Designated as Hedging Instrument [Member] 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] Required distribution of taxable net income on a annual basis Required Annual Distribution of Taxable Net Income Required Annual Distribution of Taxable Net Income Subsequent Event Subsequent Events [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 on sale of agency securities, net (Loss) gain on derivative instruments and other securities, net Total other income, net Noninterest Income Expenses: Noninterest Expense [Abstract] Management fees Management fees Management fees General and administrative expenses General and Administrative Expense Total expenses Operating Expenses Income before income tax Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for income taxes Excise and REIT Income tax Excise and REIT Income tax Net income Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized gain (loss) on available-for-sale securities, net Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Weighted average number of common shares outstanding-basic and diluted Weighted Average Number Of Common Shares Outstanding Basic And Diluted Number of basic and diluted shares, determined by relating the portion of time within a reporting period that common and dilutive shares have been outstanding to the total time in that period. Net income per common share-basic and diluted Earnings Per Share, Basic and Diluted Comprehensive income per share - basic and diluted Comprehensive income per share - basic and diluted Comprehensive income per share - basic and diluted Beginning Notional Amount Notional Amount of Cash Flow Hedge Instruments Additions Notional Amount Of Cash Flow Hedge Instruments Additions During The Period Notional Amount Of Cash Flow Hedge Instruments Additions During The Period Settlement /Expirations Notional Amount Of Cash Flow Hedge Instruments Settlements Expirations During The Period Notional Amount Of Cash Flow Hedge Instruments Settlements Expirations During The Period Ending Notional Amount Fair Value as of Period End Cash Flow Hedges Derivative Instruments at Fair Value, Net Average Maturity as of Period End (Months) Cash Flow Hedges Derivative Instruments Average Remaining Maturity Cash Flow Hedges Derivative Instruments Average Remaining Maturity Amount of Gain or (Loss) Recognized in Earnings (Ineffective Portion and Amount Excluded from Effectiveness Testing) 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] Markit IOS Total Return Swaps - Short [Member] U.S. Treasury futures [Member] U.S. Treasury futures [Member] U.S. Treasury futures [Member] Markit IOS Total Return Swaps - Long [Member] Derivative assets, at fair value [Member] Derivative assets, at fair value [Member] Derivative Assets At Fair Value [Member] Derivative liabilities, at fair value [Member] Derivative liabilities, at fair value [Member] Derivative Liabilities At Fair Value [Member] Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, De-Designated Interest Rate Swaps Notional Amount of Derivatives Notional Amount of Derivatives Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Derivative assets not designated as hedging instruments Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Derivative liabilities not designated as hedging instruments Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value Derivative Instruments, Gain (Loss) Recognized in Income, Net Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge Derivative, Lower Remaining Maturity Range Derivative, Lower Remaining Maturity Range Derivative, Higher Remaining Maturity Range Derivative, Higher Remaining Maturity Range Schedule of Assets Sold under Agreements to Repurchase [Table] Schedule of Assets Sold under Agreements to Repurchase [Table] Assets Sold under Agreements to Repurchase, Maturity Periods [Axis] Assets Sold under Agreements to Repurchase, Maturity Periods [Axis] Assets Sold under Agreements to Repurchase, Maturity Period [Domain] Assets Sold under Agreements to Repurchase, Maturity Period [Domain] 1 Month or Less Maturity up to 30 days [Member] 1 - 2 Months Maturity Thirty One To Sixty Days [Member] Maturity Thirty One To Sixty Days [Member] 2 - 3 Months Maturity 61 To 90 Days [Member] Maturity 61 To 90 Days [Member] 3 - 6 Months Maturity 90 to 180 Days [Member] Maturity 90 to 180 Days [Member] 6 - 9 Months Maturity 180 to 270 days [Member] Maturity 180 to 270 days [Member] 9 Months or Greater Maturity of 9 Months or Greater [Member] Maturity of 9 Months or Greater [Member] Borrowings Outstanding Securities Sold under Agreements to Repurchase 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 Statement of Stockholders' Equity [Abstract] Preferred Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Retained Earnings (Accumulated Deficit) [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss) [Member] Balance, value Stockholders' Equity Attributable to Parent Balance, Preferred Stock, shares Preferred Stock, Shares Outstanding Balance, Common Stock, shares Common Stock, Shares, Outstanding Other comprehensive income (loss): Issuance of common stock, shares Common dividends declared Dividends, Common Stock, Cash Balance, value Balance, Preferred Stock, shares Balance, Common Stock, shares Derivatives By Maturity [Axis] Derivatives By Maturity [Axis] Derivatives by Maturity [Domain] Derivatives by Maturity [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] More Than Three Years And Less Then Five Year From Balance Sheet Date And Thereafter [Member] More Than Three Years And Less Then Five Year From Balance Sheet Date And Thereafter [Member] More Than Three Years And Less Then Five Year From Balance Sheet Date And Thereafter [Member] Greater Than Five Years and Less than or Equal to Seven Years [Member] Greater Than Five Years and Less than or Equal to Seven Years [Member] Greater Than Five Years and Less than or Equal to Seven Years [Member] Greater Than Seven Years and Less than or Equal to Ten Years [Member] Greater Than Seven Years and Less than or Equal to Ten Years [Member] Greater Than Seven Years and Less than or Equal to Ten Years [Member] Greater Than Ten Years [Member] Greater Than Ten Years [Member] Greater Than Ten Years [Member] Schedule of Life Settlement Contracts, Fair Value Method, Five Year Disclosure [Axis] Schedule of Life Settlement Contracts, Fair Value Method, Five Year Disclosure [Axis] Five Year Disclosure [Domain] Five Year Disclosure [Domain] Notional Amount Notional Amount of Interest Rate Derivatives Average fixed pay rate Interest Rate Derivative Designated As Hedging Instruments Average Fixed Pay Rate Interest Rate Derivative Designated As Hedging Instruments Average Fixed Pay Rate Average receive rate Interest Rate Derivative Designated As Hedging Instruments Average Fixed Receive Rate Interest Rate Derivative Designated As Hedging Instruments Average Fixed Receive Rate Net Estimated Fair Value Interest Rate Cash Flow Hedge Derivative at Fair Value, Net Average Maturity (Years) Average Fixed Pay Rate Interest Rate Derivative Not Designated As Hedging Instruments Average Fixed Pay Rate Interest Rate Derivative Not Designated As Hedging Instruments Average Fixed Pay Rate Average Receive Rate Net Estimated Fair Value Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net Notional amount of forward starting swaps Remaining interest rate swap term, minimum Remaining interest rate swap term, maximum New Accounting Pronouncements or Change in Accounting Principle [Line Items] Investment Securities Investment, Policy [Policy Text Block] Interest Income Interest Income [Policy Text Block] Interest Income [Policy Text Block] Derivative and other Hedging Instruments Derivatives, Policy [Policy Text Block] Reclassifications Comparability of Prior Year Financial Data, Policy [Policy Text Block] Unaudited Interim Financials [Abstract] Unaudited Interim Financials [Abstract] Unaudited Interim Consolidated Financial Statements Consolidation, Policy [Policy Text Block] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Future Prepayment Rate Assumption Of Investment Portfolio Weighted average life of interest-only securities Weighted Average Life of Interest Only Securities Weighted Average Life of Interest Only Securities Weighted average life of principal-only securities Weighted Average Life Of Principal Only Securities Weighted average life of principal only securities. Unrealized gain on interest-only and principal-only securities Realized gain on sale of interest-only and principal-only securities Realized Gain On Agency Securities Realized Gain On Agency Securities Sales of interest-only or principal-only securities Proceeds From Sale sOf Interest Only and Principal Only Securities Proceeds From Sale sOf Interest Only and Principal Only Securities Fair value of CMO securities and interest-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. Fair value of CMO securities and interest-only securities including net asset value 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, Pricincipal 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 Transfer of agency securities under cost basis Securitization Of Agency Securities Under Cost Basis Securitization Of Agency Security For Cash Proceeds from securitizations of agency securities under cost of basis Proceeds From Securitizations Of Agency Securities Proceeds From Securitizations Of Agency Securities To-be-issued interest-only security collateralized by the agency securities transferred To Be Issued Securities Collateralized By Agency Securities Transferred To Be Issued Securities Collateralized By Agency Securities Transferred Fair value of agency securities collaterizing debt issued by securitization trust Securities Held as Collateral, at Fair Value 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 Collateralized debt outstanding issued by securitization trust Secured Debt 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 Notional Amount Pay Rate Interest Rate Derivative Not Designated As Hedging instruments Pay Rate Interest Rate Derivative Not Designated As Hedging instruments Pay Rate Receive Rate Interest Rate Derivative Not Designated As Hedging Instruments Receive Rate Interest Rate Derivative Not Designated As Hedging Instruments Receive Rate Term (Years) Derivatives Average Term Derivatives Average Term 30 Days or Less [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] Greater than 90 Days [Member] Maturity over 90 days [Member] Fair value Agency Securities Pledged As Collateral Amortized Cost Under Repurchase Agreements Item represents agency securities pledged as collateral under repurchase agreements at amortized cost. Amortized cost Agency Securities Pledged As Collateral Amortized Cost Item represents agency securities pledged as collateral at amortized cost. Accrued Interest on pledged agency securities Agency Securities Pledged As Collateral Accrued Interest Item represents accrued interest on agency securities pledged as collateral. Agency securities pledged as collateral that were sold but not yet settled Derivative and Other Hedging Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Position [Axis] Derivative Position [Domain] Long [Member] Long Term [Member] Long Term [Member] Short [Member] Short Term [Member] Short Term [Member] Net [Member] Net [Member] Net 5.0%, 30-Year, Fixed Rate, Fannie Mae MBS Pools [Member] Five Point Zero Percentage Thirty Year Fixed Rate Fannie Mae MBS Pools [Member] Five Point Zero Percentage, Thirty Year, Fixed Rate, Fannie Mae MBS Pools [Member] Five Point Zero Percentage Thirty Year Fixed Rate Fannie Mae MBS Pools, Expiring 2040 [Member] [Member] Five Point Zero Percentage Thirty Year Fixed Rate Fannie Mae MBS Pools, Expiring 2040 [Member] [Member] Five Point Zero Percentage Thirty Year Fixed Rate Fannie Mae MBS Pools, Expiring 2040 [Member] [Member] 5.5%, 30-Year, Fixed Rate, Fannie Mae MBS Pools [Member] Five Point Five Percentage Thirty Year Fixed Rate Fannie Mae MBS Pools [Member] Five Point Five Percentage, Thirty Year, Fixed Rate, Fannie Mae MBS Pools [Member] Notional Amount Derivative Instrument, Expiration Date Derivative Instrument, Expiration Date Derivative Instrument, Expiration Date Stockholders' Equity Attributable to Parent [Abstract] Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] Restricted Stock [Member] Restricted Stock [Member] Deferred Compensation Arrangement with Individual, Share-based Payments, by Title of Individual [Axis] Deferred Compensation Arrangement with Individual, Share-based Payments, by Title of Individual [Axis] Title of Individual with Relationship to Entity [Domain] Title of Individual with Relationship to Entity [Domain] Total Independent Director [Member] Director [Member] Each Independent Directors [Member] Each Director [Member] Each Director [Member] Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] Restricted Stock Awards, Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Shares of Restricted Common Stock Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Restricted Stock Awards, Grants, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Shares Available for Issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Unrecognized stock-based compensation Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Stock-based compensation Share-based Compensation Guarantor Obligations by Underlying Asset Class [Axis] Guarantor Obligations by Underlying Asset Class [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Document Period End Date Document Period End Date Agency MBS sold, at cost Cost Of Sale Of Available For Sale Secuities CostOfSaleOfAvailableForSaleSecuities Proceeds from agency MBS sold Gross gains on sale of agency MBS Marketable Securities, Realized Gain (Loss) Gross losses on sale of agency MBS Available-for-sale Securities, Gross Realized Losses Net gains on sale of agency MBS 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. Schedule of Trading Securities and Other Trading Assets, Major Types of Trading Securities and Assets [Axis] Schedule of Trading Securities and Other Trading Assets, Major Types of Trading Securities and Assets [Axis] Major Types of Trading Securities and Assets [Domain] Major Types of Trading Securities and Assets [Domain] Fixed-Rate [Member] Fixed Income Securities [Member] Adjustable-Rate [Member] Adjustable-Rate [Member] Adjustable-Rate [Member] CMO [Member] Collateralized Mortgage Obligations [Member] Interest-Only-Strip [Member] Interest-Only-Strip [Member] Interest-Only And Principal-Only Securities [Member] Interest Only And Principal Only Strip [Member] Interest Only And Principal Only Strip [Member] Prepayment Rate Of Remaining Life Of Investment Portfolio 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. Gross unrealized gains Agency Securities Gross Unrealized Gain This item represents the gross unrealized gains for agency securities, at a point in time. Gross unrealized losses Agency Securities Pledged As Collateral Gross Unrealized Loss This item represents the gross unrealized losses for agency securities, at a point in time. Available-for-sale Securities, Fair Value Disclosure Available-for-sale Securities, Fair Value Disclosure Amortized cost Fair Value Total Agency Securities Derivatives By Maturity [Axis] Derivatives by Maturity [Domain] 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] Payer Interest Rate Swaps [Member] Payer Interest Rate Swaps [Member] Payer Interest Rate Swaps [Member] Securitites borrowed under reverse purchase agreements, fair value Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Notional Amount of Interest Rate Derivatives Average Fixed Pay Rate Net Estimated Fair Value Additions Of Interest Rate Cash Flow Hedge Derivatives Additions Of Interest Rate Cash Flow Hedge Derivatives Additions Of Interest Rate Cash Flow Hedge Derivatives Terminations Of Interest Rate Cash Flow Hedge Derivatives Terminations Of Interest Rate Cash Flow Hedge Derivatives Terminations Of Interest Rate Cash Flow Hedge Derivatives Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 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 Other Derivatives Not Designated as Hedging Instruments Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Risk of repurchase agreement to stockholders equity Risk Of Repurchase Agreement To Stockholders Equity Risk Of Repurchase Agreement To Stockholders Equity Other Long-term Debt Debt Instrument, Description of Variable Rate Basis, LIBOR Debt Instrument, Description of Variable Rate Basis Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Spread Over LIBOR Spread Over LIBOR Spread Over LIBOR 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 [Member] Greater Than Five Years [Member] Greater Than Five Years [Member] Weighted Average Life of Interest Only Securities Available For Sale Securities Weighted Average Life 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. Available For Sale Securities Weighted Average Life 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 Agency securities classified as available for sale, Amortized cost Weighted average coupon Available For Sale Securities Weighted Average Life Coupon Rate This item represents the weighted average life of available-for-sale agency securities by weighted average coupon rate. Weighted Average Life Of Principal Only Securities Trading Assets, Excluding Debt and Equity Securities [Member] Trading Assets, Excluding Debt and Equity Securities [Member] Interest Rate Swap Assets [Member] Interest Rate Swap Assets [Member] Interest Rate Swap Assets [Member] Interest Rate Swap Liabilities [Member] Interest Rate Swap Liabilities [Member] Interest Rate Swap Liabilities [Member] Derivative assets, at fair value Interest Rate Cash Flow Hedge Asset at Fair Value Derivative liabilities, at fair value Interest Rate Cash Flow Hedge Liability at Fair Value Interest Rate Cash Flow Hedge Derivative at Fair Value, Net Interest Rate Swap Term (in years) 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 Borrowings under Repurchase Agreements and Weighted Average Interest Rates [Table Text Block] Statement of Financial Position [Abstract] Assets: Assets [Abstract] Agency securities, at fair value (including pledged securities of $72,598 and $50,725, respectively) U.S. Treasury securities, at fair value (pledged security) Cash and cash equivalents Restricted cash Restricted Cash and Cash Equivalents Derivative assets, at fair value Receivable for agency securities sold 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 Other debt Payable for agency securities purchased Payables to Broker-Dealers and Clearing Organizations Derivative liabilities, at fair value Dividend payable Dividends Payable Accounts payable and other accrued liabilities Accounts Payable and Accrued Liabilities Total liabilities Liabilities Stockholders' equity: Preferred stock, $0.01 par value; 10 shares authorized, 0 shares issued and outstanding, respectively Preferred Stock, Value, Issued Common stock, $0.01 par value; 300 shares authorized, 300 and 224 shares issued and outstanding, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings (deficit) Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity 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 Losses 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 Losses 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 Losses Additions Terminations Hedge De-Designation Hedge De-Designation Of Interest Rate Cash Flow Hedge Derivatives Hedge De-Designation Of Interest Rate Cash Flow Hedge Derivatives Ending notional amount Notional Amount of Interest Rate Cash Flow Hedge Derivatives Document and Entity Information [Abstract] -- None. No documentation exists for this element. -- Document Type Document Type Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Entity Filer Category Entity Filer Category Current Fiscal Year End Date Current Fiscal Year End Date Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Trading Symbol Trading Symbol Agency securities, pledged assets Preferred stock, par value Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred stock, shares outstanding Common stock, par value 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