Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Disclosure of Repurchase Agreements [Abstract] Schedule of Repurchase Agreement Counterparty [Table] Schedule of Repurchase Agreement Counterparty [Table] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Bank of America-Merrill Lynch Bank of America - Merrill Lynch [Member] Bank of America - Merrill Lynch [Member] BNP Paribas Securities Corp. BNP Paribas Securities Corporation [Member] BNP Paribas Securities Corporation [Member] Credit Suisse First Boston Credit Suisse First Boston [Member] Credit Suisse First Boston [Member] Royal Bank of Canada Royal Bank of Canada [Member] Royal Bank of Canada [Member] UBS AG UBS AG [Member] UBS AG [Member] Wells Fargo Securities Wells Fargo Securities [Member] Wells Fargo Securities [Member] Repurchase Agreement Counterparty [Line Items] Repurchase Agreement Counterparty [Line Items] Amount at Risk Repurchase Agreement Counterparty, Amount at Risk Weighted Average Maturity in days Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements Investments, Debt and Equity Securities [Abstract] Agency Securities, Available for Sale Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Quarterly Financial Information Disclosure [Abstract] Interest Income: Interest Income: [Abstract] -- None. No documentation exists for this element. -- Agency Securities, net of amortization of premium Interest and Dividend Income, Securities, Operating, Available-for-sale Non-Agency Securities, including discount accretion Interest and Dividend Income, Securities, Operating, Trading or Measured at Fair Value Total Interest Income Interest and Dividend Income, Securities, Operating Interest expense Interest Expense Net Interest Income Interest Income (Expense), Net Realized gain (loss) on sale of Agency Securities (reclassified from Other comprehensive income (loss)) Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments Gain (loss) on Non-Agency Securities Trading Securities, Realized Gain (Loss) Unrealized net gain (loss) and net interest income (loss) from Linked Transactions Unrealized Net Gain (Loss) and Net Interest Income From Linked Transactions Unrealized Net Gain (Loss) and Net Interest Income From Linked Transactions Realized gain (loss) on derivatives Gain (Loss) on Sale of Derivatives Unrealized gain (loss) on derivatives Unrealized Gain (Loss) on Derivatives Expenses Operating Expenses Net Income (Loss) Net Income (Loss) Attributable to Parent Net income (loss) per common share (in dollars per share) Earnings Per Share, Basic and Diluted Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Common stock dividends declared Dividends, Common Stock, Cash Dividends per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Common Shares of record end of period Common Stock, Shares, Issued Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] ACM Limited Liability Company [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Management Fee Management Fee [Member] Management Fee [Member] Reimbursement Reimbursement [Member] Reimbursement [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Automatic renewal period of management agreement Related Party Transaction, Management Agreement, Automatic Renewal Period Related Party Transaction, Management Agreement, Automatic Renewal Period Period of written notice of termination Related Party Transaction, Management Agreement, Period of Written Notice of Termination Related Party Transaction, Management Agreement, Period of Written Notice of Termination Management fee Related Party Transaction, Expenses from Transactions with Related Party Statement of Cash Flows [Abstract] Cash Flows From Operating Activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net Loss Adjustments to reconcile net loss to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net amortization of premium on Agency Securities Net Amortization of Premium on Available-for-sale Securities Net Amortization of Premium on Available-for-sale Securities Accretion of net discount on Non-Agency Securities Accretion of Discounts, Trading Securities Accretion of Discounts, Trading Securities Net (gain) loss on Non-Agency Securities (Gain) Loss on sale of Agency Securities Other than temporary impairment of Agency Securities Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities Unrealized net (gain) loss and net interest income (loss) from Linked Transactions Gain on short sale of U.S. Treasury Securities (Gain) Loss on Short Sale of US Treasury Securities (Gain) Loss on Short Sale of US Treasury Securities Stock based compensation Share-based Compensation Changes in operating assets and liabilities: Increase (Decrease) in Operating Assets [Abstract] (Increase) decrease in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Increase in prepaid and other assets Increase (Decrease) in Prepaid Expense and Other Assets Increase (decrease) in derivatives, at fair value Increase (Decrease) in Derivative Assets and Liabilities Increase (decrease) in accrued interest payable Increase (Decrease) in Interest Payable, Net Increase (decrease) in accounts payable and other accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash Flows From Investing Activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Purchases of Agency Securities Payments to Acquire Available-for-sale Securities, Debt Purchases of Non-Agency Securities Payments to Acquire Trading Securities Held-for-investment Cash receipts (disbursements) on Linked Transactions Proceeds From (Payments For) Linked Transactions Proceeds From (Payments For) Linked Transactions Principal repayments of Agency Securities Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Principal repayments of Non-Agency Securities Proceeds from Maturities, Repayments and Calls of Trading Securities Held-for-investment Proceeds from sales of Agency Securities Proceeds from Sale of Available-for-sale Securities Proceeds from sales of Non-Agency Securities Proceeds from Sale of Trading Securities Held-for-investment Disbursements on reverse repurchase agreements Payments for Securities Purchased under Agreements to Resell Principal receipts on reverse repurchase agreements Proceeds from Securities Purchased under Agreements to Resell (Increase) decrease in cash collateral Increase (Decrease) Cash Collateral from Counterparties Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Cash Flows From Financing Activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Issuance of common stock, net of expenses Proceeds from Issuance of Common Stock Proceeds from repurchase agreements Proceeds From Securities Sold Under Agreements To Repurchase Proceeds From Securities Sold Under Agreements To Repurchase Principal repayments on repurchase agreements Payments For Securities Sold Under Agreements To Repurchase Payments For Securities Sold Under Agreements To Repurchase Proceeds from sales of U.S. Treasury Securities Proceeds from Short Sales of U.S. Treasury Securities, Financing Activities Proceeds from Short Sales of U.S. Treasury Securities, Financing Activities Purchases of U.S. Treasury Securities Payments to Acquire US Treasury Securities, Financing Activities Payments to Acquire US Treasury Securities, Financing Activities Common stock dividends paid Payments of Ordinary Dividends, Common Stock Common stock repurchased Payments for Repurchase of Common Stock Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net increase (decrease) in cash Cash and Cash Equivalents, Period Increase (Decrease) Cash - beginning of year Cash and Cash Equivalents, at Carrying Value Cash - end of year Supplemental Disclosure: Supplemental Cash Flow Information [Abstract] Cash paid for income taxes Income Taxes Paid Cash paid during the year for interest Interest Paid, Net Non-Cash Investing and Financing Activities: Noncash Investing and Financing Items [Abstract] Unrealized gain (loss) on investment in available for sale securities Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax Linked Transaction Value of Purchased Non-Agency Securities Linked Transaction Value of Trading Securities Purchased Linked Transaction Value of Trading Securities Purchased Amounts payable for common stock repurchased Repurchase of Common Stock, Amounts Payable Repurchase of Common Stock, Amounts Payable Fair Value Disclosures [Abstract] Number of dealers received quotes from Available-for-sale Securities, Quotes Received, Number of Dealers Available-for-sale Securities, Quotes Received, Number of Dealers Commitments and Contingencies Disclosure [Abstract] Other Commitments [Table] Other Commitments [Table] Other Commitments [Line Items] Other Commitments [Line Items] Monthly percentage of effective management fee percentage Related Party Transaction, Management Agreement, Monthly Percentage of Effective Management Fee Percentage Related Party Transaction, Management Agreement, Monthly Percentage of Effective Management Fee Percentage Percentage of gross equity raised used in calculation of management fee up to 1 Billion Related Party Transaction, Management Agreement, Percentage of Gross Equity Raised Used in Calculation of Management Fee up to One Billion Related Party Transaction, Management Agreement, Percentage of Gross Equity Raised Used in Calculation of Management Fee up to One Billion Percentage of gross equity raised used in calculation of management fee in excess of 1 Billion Related Party Transaction, Management Agreement, Percentage of Gross Equity Raised Used in Calculation of Management Fee in Excess of One Billion Related Party Transaction, Management Agreement, Percentage of Gross Equity Raised Used in Calculation of Management Fee in Excess of One Billion Gross equity raised Related Party Transaction, Management Agreement, Gross Equity Raised Related Party Transaction, Management Agreement, Gross Equity Raised Non-Agency Securities, Trading Schedule of Assets Sold under Agreements to Repurchase [Table] Schedule of Assets Sold under Agreements to Repurchase [Table] Securities or Other Assets Sold under Agreements to Repurchase, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Assets Sold under Agreements to Repurchase, Maturity Period [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Within 30 days Maturity Less than 30 Days [Member] 31 days to 60 days Maturity 31 To 60 Days [Member] -- None. No documentation exists for this element. -- 61 days to 90 days Maturity 61 To 90 Days [Member] -- None. No documentation exists for this element. -- Assets Sold under Agreements to Repurchase [Line Items] Assets Sold under Agreements to Repurchase [Line Items] Repurchase Agreements Assets Sold under Agreements to Repurchase, Carrying Amount Weighted Average Contractual Rate Assets Sold under Agreements to Repurchase, Interest Rate Repurchase Agreements Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash Cash and Cash Equivalents, Fair Value Disclosure Cash collateral posted to counterparties Cash Collateral for Borrowed Securities, Fair Value Disclosure Cash Collateral for Borrowed Securities, Fair Value Disclosure Accrued interest receivable Accrued Interest Receivable, Fair Value Disclosure Accrued interest receivable, fair value disclosure. Financial Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Repurchase agreements Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Cash collateral posted by counterparties Cash Collateral Held For Counterparties, Fair Value Disclosure Cash Collateral Held For Counterparties, Fair Value Disclosure Accrued interest payable Accrued Interest Payable, Fair Value Disclosure Accrued interest payable, fair value disclosure. Concentration Risk [Table] Concentration Risk [Table] Investments by Category [Axis] Investments by Category [Axis] Marketable Securities and Investments Held at Cost [Domain] Marketable Securities and Investments Held at Cost [Domain] Non-Agency Securities Trading Securities [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Market Based Securities Market Based Securities [Member] Market Based Securities [Member] Market Based Securities Inclusive of Linked Transactions, Forward Contracts Market Based Securities Inclusive of Linked Transactions, Forward Contracts [Member] Market Based Securities Inclusive of Linked Transactions, Forward Contracts [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Portfolio Concentration Risk Portfolio Concentration Risk [Member] Portfolio Concentration Risk [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Trading securities purchased previously treated as linked transactions Trading Securities Purchased Previously Treated as Linked Transactions Trading Securities Purchased Previously Treated as Linked Transactions Repayment at maturity of linked transactions transferred to trading securities Repayment at Maturity of Linked Transactions, Transferred to Trading Securities Repayment at Maturity of Linked Transactions, Transferred to Trading Securities Percentage of concentration risk Concentration Risk, Percentage US treasury securities received in year one and two Long Term Collateral Exchange Agreement, US Treasury Securities Received in Year One and Two Long Term Collateral Exchange Agreement, US Treasury Securities Received in Year One and Two US treasury securities received in year three Long Term Collateral Exchange Agreement, US Treasury Securities Received in Year Three Long Term Collateral Exchange Agreement, US Treasury Securities Received in Year Three Derivative Instruments and Hedging Activities Disclosure [Abstract] Offsetting Liabilities [Table] Offsetting Liabilities [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate swap contracts Interest Rate Swap [Member] Offsetting Liabilities [Line Items] Offsetting Liabilities [Line Items] Gross Derivative Liability Derivative Liability, Fair Value, Gross Liability Derivative Liability Derivative Liability Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments Derivative Liability, Not Offset, Policy Election Deduction Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Posted Derivative, Collateral, Right to Reclaim Cash Gross Amounts Not Offset in the Consolidated Balance Sheet, Net Amount Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Linked Transactions Linked Transactions [Member] -- None. No documentation exists for this element. -- Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] 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, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Balance, beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Linked Transaction value of purchased Non-Agency Securities Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers Between Investment Categories Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers Between Investment Categories Cash (receipts) disbursements on Linked Transactions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Unrealized net gain (loss) and net interest income (loss) from Linked Transactions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Balance, end of period Gain (loss) on Linked Transactions Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Basis of Accounting [Text Block] Trading Securities Trading Securities [Table Text Block] Trading Securities [Table] Trading Securities [Table] Schedule of Trading Securities and Other Trading Assets [Line Items] Schedule of Trading Securities and Other Trading Assets [Line Items] Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Trading Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] Trading Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] Document and Entity Information [Abstract] -- None. No documentation exists for this element. -- Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus (Q1,Q2,Q3,FY) Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Equity [Abstract] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Stock repurchase program, shares authorized (in shares) Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock repurchase program, remaining authorized (in shares) Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2012 Stock Incentive Plan 2012 Stock Incentive Plan [Member] 2012 Stock Incentive Plan [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock 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] Maximum number of common shares reserved for grant of awards as percentage of total common shares issued and outstanding Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum Number of shares available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Dividends Transactions Dividends Declared [Table Text Block] Schedule of Stockholders Equity Schedule of Stockholders Equity [Table Text Block] Sale of Stock [Table] Sale of Stock [Table] Sale of Stock [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Weighted Average Weighted Average [Member] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] Common equity distribution agreements Equity Distribution Agreement [Member] -- None. No documentation exists for this element. -- Common stock follow-on public offering Follow-On Public Offering [Member] Follow-On Public Offering [Member] Sale of Stock [Line Items] Sale of Stock [Line Items] [Line Items] for Sale of Stock [Table] Number of shares reinvested Stock Issued During Period, Shares, Dividend Reinvestment Plan Per share price reinvested (in dollars per share) Shares Issued, Dividend Reinvestment Plan, Price Per Share Shares Issued, Dividend Reinvestment Plan, Price Per Share Net proceeds reinvested Stock Issued During Period, Value, Dividend Reinvestment Plan Number of Shares Stock Issued During Period, Shares, New Issues Per share price (in dollars per share) Shares Issued, Price Per Share Net Proceeds Stock Issued During Period, Value, New Issues Earnings Per Share [Abstract] Net loss per common share (in dollars per share) Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Organization and Nature of Business Operations Nature of Operations [Text Block] Income Statement [Abstract] Other Income (Loss): Noninterest Income [Abstract] Other than temporary impairment of Agency Securities (reclassified from Other comprehensive income (loss); no amounts remaining in Accumulated other comprehensive income (loss)) Gain on short sale of U.S. Treasury Securities Short Sale of US Treasury Securities, Net Realized Gain (Loss) Short Sale of US Treasury Securities, Net Realized Gain (Loss) Subtotal Gain (Loss) on Available-for-sale Securities and Short Sales Gain (Loss) on Available-for-sale Securities and Short Sales Unrealized gain (loss) on derivatives Subtotal Gain (Loss) on Derivative Instruments, Net, Pretax Total Other Loss Other Operating Income (Loss) Other Operating Income (Loss) Expenses: Operating Expenses [Abstract] Professional fees Professional Fees Insurance General Insurance Expense Board compensation Labor and Related Expense Other Other Expenses Total Expenses Loss before taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Interest Rate Risk [Abstract] Interest Rate Risk [Abstract] Interest Rate Risk Interest Rate Risk Disclosure [Text Block] Description of the sources of interest rate risk exposure faced by the entity. Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Agency Securities Available-for-sale Securities [Member] Market Based Securities Including Trading Securities Underlying Linked Transactions Market Based Securities Including Trading Securities Underlying Linked Transactions [Member] Market Based Securities Including Trading Securities Underlying Linked Transactions [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Percentage of portfolio invested Other than temporary impairment of Agency Securities Agency Securities, available for sale Available-for-sale Securities, Debt Securities Weighted average coupon rate Available For Sale Securities, Weighted Average Coupon Rate Agency Securities, fixed rate securities, weighted average coupon. Gross realized gains (losses) from sale proceeds Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds Realized gain (loss) on sale of Agency Securities Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Fannie Mae Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] Freddie Mac Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Multi-Family MBS Multi-Family Residential Mortgage Backed Securities [Member] Multi-Family Residential Mortgage Backed Securities [Member] 10 Year Fixed 10-Year Fixed Rate Agency Securities [Member] 10-Year Fixed Rate Agency Securities [Member] 15 Year Fixed 15-Year Fixed Rate Agency Securities [Member] 15-Year Fixed Rate Agency Securities [Member] 20 Year Fixed 20-Year Fixed Rate Agency Securities [Member] 20-Year Fixed Rate Agency Securities [Member] 30 Year Fixed 30-Year Fixed Rate Agency Securities [Member] 30-Year Fixed Rate Agency Securities [Member] Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis Gross Unrealized Loss Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Gross Unrealized Gain Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Fair Value Net Loss per Common Share Earnings Per Share [Text Block] Dividends declared per common share (in dollars per share) Rate per common share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Aggregate amount paid to holders of record (in dollars) Number of Shares Stock Repurchased During Period, Shares Per Share price Common Stock Acquired, Average Cost Per Share Common Stock Acquired, Average Cost Per Share Net Cost Stock Repurchased During Period, Value Schedule of Quarterly Financial Information Schedule of Quarterly Financial Information [Table Text Block] Fair Value Trading Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] Trading Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] Less than one year Trading Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value Trading Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value Greater than or equal to one year and less than three years Trading Securities, Debt Maturities, Rolling Year Two and Three, Fair Value Trading Securities, Debt Maturities, Rolling Year Two and Three, Fair Value Greater than or equal to three years and less than five years Trading Securities, Debt Maturities, Rolling Year Four and Five, Fair Value Trading Securities, Debt Maturities, Rolling Year Four and Five, Fair Value Greater than or equal to five years Trading Securities, Debt Maturities, Rolling After Year Five, Fair Value Trading Securities, Debt Maturities, Rolling After Year Five, Fair Value Total Non-Agency Securities Trading Securities, Debt Amortized Cost Trading Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] Trading Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] Less than one year Trading Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis Trading Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis Greater than or equal to one year and less than three years Trading Securities, Debt Maturities, Rolling Year Two and Three, Amortized Cost Basis Trading Securities, Debt Maturities, Rolling Year Two and Three, Amortized Cost Basis Greater than or equal to three years and less than five years Trading Securities, Debt Maturities, Rolling Year Four Through Five, Amortized Cost Basis Trading Securities, Debt Maturities, Rolling Year Four Through Five, Amortized Cost Basis Greater than or equal to five years Trading Securities, Debt Maturities, Rolling After Year Five, Amortized Cost Basis Trading Securities, Debt Maturities, Rolling After Year Five, Amortized Cost Basis Total Non-Agency Securities Trading Securities, Debt, Amortized Cost Subsequent Event [Table] Subsequent Event [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] JMI Acquisition Corp. JMI Acquisition Corp. [Member] JMI Acquisition Corp. [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Javelin Mortgage Investment Corp. Javelin Mortgage Investment Corp. [Member] Javelin Mortgage Investment Corp. [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Rate per common share (in dollars per share) Percentage of acquiree value Business Combination, Aggregate Purchase Price, Percentage of Acquiree Value Business Combination, Aggregate Purchase Price, Percentage of Acquiree Value Reduction in transaction expense Business Combination, Aggregate Purchase Price, Reduction in Transaction Expense Business Combination, Aggregate Purchase Price, Reduction in Transaction Expense Number of days prior to offer expiration that tender offer price will be set (in days) Business Combination, Aggregate Purchase Price, Number of Days Prior to Offer Expiration that Tender Offer Price will be Set Business Combination, Aggregate Purchase Price, Number of Days Prior to Offer Expiration that Tender Offer Price will be Set Percent of outstanding shares converted to rights Business Combination, Aggregate Purchase Price, Percent of Outstanding Shares Converted to Rights Business Combination, Aggregate Purchase Price, Percent of Outstanding Shares Converted to Rights Expenses to be reimbursed if agreement if terminated (up to) Business Acquisition, Expenses to be Reimbursed if Agreement if Terminated Business Acquisition, Expenses to be Reimbursed if Agreement if Terminated Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Interest rate swaptions Interest Rate Swaption [Member] TBA Agency Securities To-be-Announced Agency Securities [Member] To-be-Announced Agency Securities [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Realized loss on derivatives Realized Loss on Derivatives [Member] Realized Loss on Derivatives [Member] Unrealized gain (loss) on derivatives Unrealized Gain (Loss) on Derivatives [Member] Unrealized Gain (Loss) on Derivatives [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Interest income Derivative, Interest Income Derivative, Interest Income Interest expense Derivative, Interest Expense Derivative, Interest Expense Total Accounting Changes and Error Corrections [Abstract] Recent Accounting Pronouncements Description of New Accounting Pronouncements Not yet Adopted [Text Block] Securities or Other Assets Sold under Agreements to Repurchase [Axis] Securities or Other Assets Sold under Agreements to Repurchase [Axis] Assets Sold under Agreements to Repurchase, Type [Domain] Assets Sold under Agreements to Repurchase, Type [Domain] U.S. Treasury Securities US Treasury Securities [Member] Repurchase Agreements Haircut on Repurchase Agreements Haircut on Repurchase Agreements Haircut on Repurchase Agreements Fair Value Trading Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] Trading Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] Less than 12 Months Trading Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Trading Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 12 Months or More Trading Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Trading Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Total Trading Securities, Continuous Unrealized Loss Position, Fair Value Trading Securities, Continuous Unrealized Loss Position, Fair Value Unrealized Losses Trading Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract] Trading Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract] Less than 12 Months Trading Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Trading Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 Months or More Trading Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Trading Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Trading Securities, Continuous Unrealized Loss Position, Accumulated Loss Trading Securities, Continuous Unrealized Loss Position, Accumulated Loss Derivative [Table] Derivative [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Derivative Derivative [Member] Derivative [Line Items] Derivative [Line Items] Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Offsetting Assets Offsetting Assets [Table Text Block] Offsetting Liabilities Offsetting Liabilities [Table Text Block] Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Offsetting Assets [Table] Offsetting Assets [Table] Offsetting Assets [Line Items] Offsetting Assets [Line Items] Gross Derivative Asset Derivative Asset, Fair Value, Gross Asset Derivative Asset Derivative Asset Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments Derivative Asset, Not Offset, Policy Election Deduction Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Held Derivative, Collateral, Obligation to Return Cash Gross Amounts Not Offset in the Consolidated Balance Sheet, Net Amount Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] Less than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 12 Months or More Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] Less than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 Months or More Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Purchases of Non-Agency Securities, at cost Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Principal repayments of Non-Agency Securities Proceeds from the sale of Non-Agency Securities Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Gain (loss) on Non-Agency Securities Linked Transactions Value of Purchased Non-Agency Securities Linked Transaction Liabilities Recognized Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Non-Cash Transfer Between Investment Categories Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Non-Cash Transfer Between Investment Categories Discount accretion Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Net Change in Discount Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Net Change in Discount Interest Rate Swap 13-24 Months Interest Rate Swap, Contract 13-24 Months [Member] Interest Rate Swap, Contract 13-24 Months [Member] Interest Rate Swap 25-36 Months Interest Rate Swap, Contract 25-36 Months [Member] Interest Rate Swap, Contract 25-36 Months [Member] Interest Rate Swap 37-48 Months Interest Rate Swap, Contract 37-48 Months [Member] Interest Rate Swap, Contract 37-48 Months [Member] Interest Rate Swap 49-60 Months Interest Rate Swap, Contract 49-60 Months [Member] Interest Rate Swap, Contract 49-60 Months [Member] Interest Rate Swap 61-72 Months Interest Rate Swap, Contract 61-72 Months [Member] Interest Rate Swap, Contract 61-72 Months [Member] Interest Rate Swap 85-96 Months Interest Rate Swap, Contract 85-96 Months [Member] Interest Rate Swap, Contract 85-96 Months [Member] Interest Rate Swap 97-108 Months Interest Rate Swap, Contract 97-108 Months [Member] Interest Rate Swap, Contract 97-108 Months [Member] Interest Rate Swap 121-132 Months Interest Rate Swap, Contract 121-132 Months [Member] Interest Rate Swap, Contract 121-132 Months [Member] Remaining / Underlying Term-Minimum Derivative, Lower Remaining Maturity Range Remaining / Underlying Term-Maximum Derivative, Higher Remaining Maturity Range Weighted Average Remaining Swap / Option Term (Months) Derivative, Average Remaining Maturity Weighted Average Rate Derivative Weighted Average Interest Rate Derivative Weighted Average Interest Rate Notional Amount Derivative, Notional Amount Asset Fair Value Liability Fair Value Notional amount of derivatives becoming effective in the next six months Derivative, Notional Amount, Becoming Effective in Next Six Months Derivative, Notional Amount, Becoming Effective in Next Six Months Schedule of Repurchase Agreements Schedule of Repurchase Agreements [Table Text Block] Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 5 Percent of Stockholders' Equity Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 5 Percent of Stockholders' Equity [Table Text Block] Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 5 Percent of Stockholders' Equity [Table Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Cash Cash collateral posted to counterparties Cash Collateral for Borrowed Securities Agency Securities, available for sale, at fair value (including pledged securities of $609,839 and $1,071,298) Non-Agency Securities, trading, at fair value (including pledged securities of $234,800 and $158,931) Linked Transactions, net, at fair value (including pledged securities of $8,940 in 2014) Linked Transactions Net At Fair Value Linked Transactions Net At Fair Value Derivatives, at fair value Accrued interest receivable Interest Receivable Prepaid and other assets Prepaid Expense and Other Assets Total Assets Assets Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Repurchase agreements Securities Sold under Agreements to Repurchase Cash collateral posted by counterparties Cash Collateral Held For Counterparties Cash Collateral Held For Counterparties Derivatives, at fair value Accrued interest payable Interest Payable Accounts payable and other accrued expenses Accounts Payable and Other Accrued Liabilities Total Liabilities Liabilities Commitments and Contingencies Commitments and Contingencies Stockholders’ Equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.001 par value, 25,000 shares authorized and none issued and outstanding Preferred Stock, Value, Issued Common stock, $0.001 par value, 250,000 shares authorized, 11,866 shares and 11,985 shares issued and outstanding at December 31, 2015 and December 31, 2014. Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated 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 Linked Transactions Disclosure [Abstract] -- None. No documentation exists for this element. -- Interest income attributable to MBS underlying Linked Transactions Interest and Dividend Income, Securities, Operating, Linked Transactions Interest and Dividend Income, Securities, Operating, Linked Transactions Interest expense attributable to linked repurchase agreements underlying Linked Transactions Repurchase Agreements, Interest Expense From Linked Transactions Repurchase Agreements, Interest Expense From Linked Transactions Gain on sale of Linked Transactions Gain (Loss) on Sale of Linked Transactions Gain (Loss) on Sale of Linked Transactions Change in fair value of Linked Transactions included in earnings Unrealized Net Gain (Loss) on Linked Transactions Unrealized Net Gain (Loss) on Linked Transactions Unrealized net gain (loss) and net interest income (loss) from Linked Transactions Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Additional Paid-In Capital Additional Paid-in Capital [Member] Retained Earnings (Accumulated Deficit) Retained Earnings [Member] Accumulated Other Comprehensive (Income) Loss AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance (in shares) Shares, Outstanding Beginning Balance Common stock dividends declared Dividends, Common Stock Issuance of common stock, net (in shares) Issuance of common stock, net Stock based compensation, net of withholding requirements (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock based compensation, net of withholding requirements Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Common stock repurchased (in shares) Common stock repurchased Other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Ending Balance (in shares) Ending Balance Non-Agency Securities and Repurchase Agreements Underlying Linked Transactions Schedule of Linked Transactions, Forward Contracts [Table Text Block] Schedule of Linked Transactions, Forward Contracts [Table Text Block] Schedule of Other Nonoperating Income (Expense) Schedule of Unrealized Net Loss and Net Interest Income From Linked Transactions [Table Text Block] Schedule of Unrealized Net Loss and Net Interest Income From Linked Transactions [Table Text Block] Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Reclassification adjustment for realized (gain) loss on sale of available for sale Agency Securities Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Reclassification adjustment for other than temporary impairment of available for sale Agency Securities Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax Net unrealized gain (loss) on available for sale Agency Securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Other comprehensive income (loss) Comprehensive Loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Common stock, shares outstanding (in shares) Agency securities pledged Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment Non-agency securities pledged Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Trading Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Trading Linked transactions pledged assets Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Linked Transactions Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Linked Transactions Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Capital Loss Carryforward Capital Loss Carryforward [Member] Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Tax credit carryforward Tax Credit Carryforward, Amount Aggregate tax basis of stockholders' equity in excess of assets and liabilities Aggregate Tax Basis Stockholders' Equity in Excess of Assets and Liabilities Aggregate Tax Basis Stockholders' Equity in Excess of Assets and Liabilities Aggregate tax basis of stockholders' equity in excess of assets and liabilities (in dollars per share) Aggregate Tax Basis Stockholders' Equity in Excess of Assets and Liabilities Per Share Aggregate Tax Basis Stockholders' Equity in Excess of Assets and Liabilities Per Share Common stock dividends paid Estimated REIT Taxable Income Estimated REIT Taxable Income Estimated REIT Taxable Income Percent of dividends that represent nontaxable return of capital Dividends, Percent of Dividends that Represent Nontaxable Return of Capital Dividends, Percent of Dividends that Represent Nontaxable Return of Capital Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Assets at Fair Value: Assets, Fair Value Disclosure [Abstract] Non-Agency Securities, trading Linked Transactions, net Liabilities at Fair Value: Liabilities, Fair Value Disclosure [Abstract] Derivatives Related Party Transactions Related Party Transactions Disclosure [Text Block] GAAP Net loss Book to tax differences: Book to tax differences: [Abstract] -- None. No documentation exists for this element. -- Net book to tax differences on Non-Agency Securities and Linked Transactions though December 31, 2014 Effective Taxable Income Rate Reconciliation, Net Book to Tax Differences on Trading Securities and Linked Transactions, Amount Effective Taxable Income Rate Reconciliation, Net Book to Tax Differences on Trading Securities and Linked Transactions, Amount Net capital losses carried forward Effective Taxable Income Reconciliation, Net Capital Losses Carried Forward Effective Taxable Income Reconciliation, Net Capital Losses Carried Forward Gain on sale of Agency Securities Effective Taxable Income Reconciliation, (Gain) Loss on Sale of Available-for-sale Securities, Amount Effective Taxable Income Reconciliation, (Gain) Loss on Sale of Available-for-sale Securities, Amount Other than temporary impairment of Agency Securities Effective Taxable Income Reconciliation, Other than Temporary Impairment Losses, Amount Effective Taxable Income Reconciliation, Other than Temporary Impairment Losses, Amount Amortization of deferred hedging gains (costs) Effective Taxable Income Reconciliation, Amortization of Financing Costs and Discounts Effective Taxable Income Reconciliation, Amortization of Financing Costs and Discounts Net premium amortization differences Effective Taxable Income Reconciliation, Net Premium Amortization Differences Effective Taxable Income Reconciliation, Net Premium Amortization Differences Changes in interest rate contracts Effective Taxable Income Reconciliation, Changes In Derivatives Effective Taxable Income Reconciliation, Changes In Derivatives Other Effective Taxable Income Reconciliation, Other Adjustments Effective Taxable Income Reconciliation, Other Adjustments Estimated taxable income Prime Fixed Mortgage Backed Securities, Prime Fixed [Member] Mortgage Backed Securities, Prime Fixed [Member] Prime Hybrid Mortgage Backed Securities, Prime Hybrid [Member] Mortgage Backed Securities, Prime Hybrid [Member] Prime Floater Mortgage Backed Securities, Prime Floater [Member] Mortgage Backed Securities, Prime Floater [Member] Alt-A Fixed Mortgage Backed Securities, Alt-A Fixed [Member] Mortgage Backed Securities, Alt-A Fixed [Member] Alt-A Hybrid Mortgage Backed Securities, Alt-A Hybrid [Member] Mortgage Backed Securities, Alt-A Hybrid [Member] Non Performing Loans Mortgage Backed Securities, Non-Performing [Member] Mortgage Backed Securities, Non-Performing [Member] Fair Value Amortized Cost Principal Amount Trading Securities, Debt, Principal Amount Trading Securities, Debt, Principal Amount Weighted Average Coupon Trading Securities, Debt, Weighted Average Coupon Rate Trading Securities, Debt, Weighted Average Coupon Rate Counterparty Concentration Risk Counterparty Concentration Risk [Member] Counterparty Concentration Risk [Member] Borrowings Borrowings [Member] Minimum Minimum [Member] Maximum Maximum [Member] Number of counterparties with master repurchase agreements Repurchase Agreements, Number of Counterparties with Master Repurchase Agreements Repurchase Agreements, Number of Counterparties with Master Repurchase Agreements Number of counterparties with outstanding borrowings Repurchase Agreements, Number Of Counterparties with Outstanding Borrowings Repurchase Agreements, Number Of Counterparties with Outstanding Borrowings Number of counterparties Repurchase Agreements, Number Of Counterparties Repurchase Agreements, Number Of Counterparties Linked Transactions Linked Transactions Disclosure [Text Block] Disclosure of linked transactions. Linked Transactions are evaluated on a combined basis, reported as forward (derivative) instruments and presented as assets on condensed consolidated balance sheets at fair value. The fair value of Linked Transactions reflect the value of the underlying Non-Agency MBS, linked repurchase agreement borrowings and accrued interest receivable/payable on such instruments. Linked Transactions are not designated as hedging instruments and, as a result, the change in the fair value and net interest income from Linked Transactions is reported in other income on the condensed consolidated statements of operations. Fair Value Inputs, Assets, Quantitative Information [Table] Fair Value Inputs, Assets, Quantitative Information [Table] Fair Value Inputs, Assets, Quantitative Information [Line Items] Fair Value Inputs, Assets, Quantitative Information [Line Items] Cumulative default Fair Value Inputs, Probability of Default Loss severity (life) Fair Value Inputs, Loss Severity Discount rate Fair Value Inputs, Discount Rate Delinquency (life) Fair Value Inputs, Delinquency Fair Value Inputs, Delinquency Voluntary prepayments (life) Fair Value Inputs, Prepayment Rate Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] 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] Carrying Values and Fair Values of Financial Assets and Liabilities Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Range of Estimates of Cumulative Default and Loss Severities and Discount Rates Fair Value Inputs, Assets, Quantitative Information [Table Text Block] Available-for-sale Securities Available-for-sale Securities [Table Text Block] Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] Fair Value Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] Less than one year Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value Greater than or equal to one year and less than three years Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Three, Fair Value Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Three, Fair Value Greater than or equal to three years and less than five years Available-for-sale Securities, Debt Maturities, Rolling Year Four Through Five, Fair Value Amount of available-for-sale debt securities at fair value maturing in the fourth rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. Greater than or equal to five years Available-for-sale Securities, Debt Maturities, Rolling After Year Five, Fair Value Amount of available-for-sale debt securities at fair value maturing after the fifth rolling twelve months following the latest balance sheet presented. Total Agency Securities Amortized Cost Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] Less than one year Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis Greater than or equal to one year and less than three years Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Three, Amortized Cost Basis Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Three, Amortized Cost Basis Greater than or equal to three years and less than five years Available-for-sale Securities, Debt Maturities, Rolling Year Four Through Five, Amortized Cost Basis Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the fourth rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Greater than or equal to five years Available-for-sale Securities, Debt Maturities, Rolling After Year Five, Amortized Cost Basis Amount of available-for-sale debt securities at cost, net of adjustments, maturing after the fifth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Quarterly Financial Data (unaudited) Quarterly Financial Information [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Cash Cash and Cash Equivalents, Policy [Policy Text Block] Cash Collateral Posted To/By Counterparties Cash Collateral Posted/(Held) from Counterparties, Policy [Policy Text Block] Cash Collateral Posted/(Held) from Counterparties, Policy [Policy Text Block] MBS, at Fair Value Marketable Securities, Policy [Policy Text Block] Agency Securities, Available For Sale Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block] Non-Agency Securities, Trading Marketable Securities, Trading Securities, Policy [Policy Text Block] Receivables and Payable for Unsettled Sales and Purchases Receivables and Payable for Unsettled Sales and Purchases, Policy [Policy Text Block] Receivables and Payable for Unsettled Sales and Purchases, Policy [Policy Text Block] Accrued Interest Receivable and Payable Accrued Interest Receivable And Payable [Policy Text Block] Disclosure of accounting policy for accrued interest receivable and payable. Repurchase Agreements and Obligations to Return Securities Received as Collateral, at Fair Value Repurchase and Resale Agreements Policy [Policy Text Block] Derivatives, at Fair Value Derivatives, Policy [Policy Text Block] Linked Transactions Linked Transactions, Policy [Policy Text Block] Linked Transactions, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Comprehensive Income (Loss) Comprehensive Income, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Linked Transactions, Forward Contracts Linked Transactions, Forward Contracts [Member] Linked Transactions, Forward Contracts [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Greater than 90 days Maturity Greater than 90 Days [Member] Prime Prime Rate [Member] Alt-A Alt-A Interest Rate [Member] Alt-A Interest Rate [Member] Balance Weighted Average Interest Rate Amortized Cost Par/Current Face Weighted Average Coupon Rate