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Financing Arrangements, Portfolio Investments - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) counterparty	Dec. 31, 2016 USD ($) counterparty	Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Repurchase agreement, average days to maturity	44 days	12 days
Accrued interest payable	$ 2,500	$ 1,100
Advance rate (as a percent)	90.00%
Average haircut (as a percent)	10.00%
Repurchase agreement, number of counterparties | counterparty	10	8
Cash and cash equivalents	$ 95,191	$ 83,554	$ 61,959
Unencumbered investment securities	$ 315,700
Liquidation proceeds (as a percent)	32.20%
Agency RMBS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average haircut (as a percent)	5.00%
Residential Mortgage Backed Securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unencumbered investment securities	$ 188,800
Non-Agency RMBS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average haircut (as a percent)	25.00%
Unencumbered investment securities	$ 50,300
CMBS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average haircut (as a percent)	24.00%
Unencumbered investment securities	$ 76,600
Held in Agency IO Portfolio for Trading Purposes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unencumbered investment securities	$ 500
Stockholders' Equity, Total | Lender Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	5.00%	5.10%
Consolidated K-Series
Accounts, Notes, Loans and Financing Receivable [Line Items]
K-series net carrying value	$ 468,000	$ 314,900
Consolidated K-Series | CMBS
Accounts, Notes, Loans and Financing Receivable [Line Items]
K-series net carrying value	377,500	254,600
Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Repurchase agreement, outstanding balance	$ 1,300,000	$ 773,100
Weighted average interest rate (as a percent)	2.18%	1.92%

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- Definition

Represents the advance rate of the Company's outstanding balance of repurchase agreements.

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Represents the aggregate carrying value of the investment in the multi-family loans held in securitization trusts.

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Number of counterparties the entity has repurchase agreements with.

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Represents the amount of unencumbered investment securities available to meet additional haircut or market valuation requirements.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Weighted average interest rate of debt outstanding.

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Indicates, if estimable, (as a percentage) the approximate extent to which the proceeds from liquidation of any assets held either as collateral or by third parties would be expected to cover the maximum potential amount of future payments under the guarantee or each group of similar guarantees.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Weighted average maturity (weighted by amount of the agreement) of repurchase agreements with the counterparty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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