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Financing Arrangements, Portfolio Investments - Narrative (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) counterparty | Dec. 31, 2016 USD ($) counterparty
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Average days to maturity | 18 days | 12 days
Interest payable | $ 500 | $ 1,100
Advance rate | 87.80% |
Average haircut | 12.20% |
Repurchase agreements, number of counterparties | counterparty | 8 |
Cash and cash equivalents | $ 101,904 | $ 83,554
Unencumbered investment securities | $ 243,100 |
Liquidation proceeds, percentage | 58.20% |
Held in Agency IO Portfolio for Trading Purposes |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Unencumbered investment securities | $ 8,900 |
Lender Concentration Risk | Stockholders' Equity |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Repurchase agreements, number of counterparties | counterparty | 0 | 0
Concentration risk, percentage |  | 5.10%
Agency RMBS |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Average haircut | 4.00% | 5.00%
Non-Agency RMBS |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Average haircut | 25.00% |
Unencumbered investment securities | $ 68,100 |
CMBS |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Average haircut | 20.00% |
Unencumbered investment securities | $ 139,900 |
Agency IOs |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Average haircut | 25.00% |
Residential Mortgage Backed Securities |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Unencumbered investment securities | $ 35,100 |
Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Repurchase agreement, amount outstanding | $ 608,300 | $ 773,100
Weighted average interest rate | 2.33% | 1.92%

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