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Repurchase Agreements - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) counterparty	Dec. 31, 2019 USD ($) counterparty	Mar. 31, 2019 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average days to maturity	15 days	73 days
Interest payable	$ 3,700	$ 8,800
Advance rate	75.10%
Average haircut	24.90%
Repurchase agreements, number of counterparties | counterparty	6	14
Cash and cash equivalents	$ 172,513	$ 118,763	$ 65,359
Unencumbered investment securities	$ 527,314	535,827
Liquidation proceeds, percentage	98.10%
Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Repurchase agreements, number of counterparties | counterparty	1
Deferred finance costs, gross	$ 700	800
Non-Agency RMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	29.00%
Unencumbered investment securities	$ 402,564	168,063
CMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	21.00%
Unencumbered investment securities	$ 82,406	$ 235,199
Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Weighted average interest rate	2.88%	2.72%

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- Definition

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 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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The fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Excludes financial instruments and other positions owned and pledged as collateral to counterparties.

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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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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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