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Repurchase Agreements - Narrative (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) counterparty	Dec. 31, 2019 USD ($) counterparty	Jun. 30, 2019 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average days to maturity	55 days	73 days
Interest payable	$ 200	$ 8,800
Advance rate	55.00%
Average haircut	45.00%
Repurchase agreements, number of counterparties | counterparty	1	14
Cash and cash equivalents	$ 371,697	$ 118,763	$ 134,993
Unencumbered investment securities	$ 812,461	535,827
Liquidation proceeds, percentage	100.00%
Credit Suisse AG, Cayman Islands Branch [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Repurchase agreement, amount at risk	$ 255,200
Residential loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Repurchase agreements, number of counterparties | counterparty	1
Deferred finance costs, gross	$ 1,400	$ 800
Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Weighted average interest rate	2.72%	2.72%

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- Definition

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

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- Definition

Average haircut percentage.

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- Definition

Number of counterparties the entity has repurchase agreements with.

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
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-Section S99
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-Subparagraph (SX 210.5-02.1)
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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

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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-SubTopic 30
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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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- Definition

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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-Section 50
-Paragraph 4
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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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The amount at risk under repurchase agreements is defined as the excess of carrying amount (or market value, if higher than the carrying amount or if there is no carrying amount) of the securities or other assets sold under agreement to repurchase, including accrued interest plus any cash or other assets on deposit to secure the repurchase obligation, over the amount of the repurchase liability (adjusted for accrued interest).

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- Definition

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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