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Repurchase Agreements - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) counterparty	Dec. 31, 2018 USD ($) counterparty	Mar. 31, 2018 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average days to maturity	68 days	62 days
Interest payable	$ 5,300	$ 3,900
Advance rate	86.90%
Average haircut	13.10%
Repurchase agreements, number of counterparties | counterparty	13	11
Cash and cash equivalents	$ 65,359	$ 103,724	$ 65,495
Unencumbered investment securities	$ 410,400
Liquidation proceeds, percentage	28.80%
Lender Concentration Risk | Stockholders' Equity
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut		5.00%
Concentration risk, percentage		5.04%
CMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	22.00%
Unencumbered investment securities	$ 205,900
Agency RMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	5.00%
Non-Agency RMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	25.00%
Unencumbered investment securities	$ 128,200
Residential Mortgage Backed Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Unencumbered investment securities	76,200
Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Repurchase agreement, amount outstanding	$ 1,700,000	$ 1,500,000
Weighted average interest rate	3.43%	3.41%
Distressed residential mortgage loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Deferred finance costs, gross	$ 1,000	$ 1,200

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

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Average haircut percentage.

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Number of counterparties the entity has repurchase agreements with.

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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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Weighted average interest rate of debt outstanding.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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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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