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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Schedule of Securitized Debt Collateralized by Non-Agency RMBS (Details) - Non-Agency RMBS Re-Securitization $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Debt Instrument [Line Items]
Principal Amount	$ 89,916
Secured debt, carrying value	$ 88,791
LIBOR | Payment December 2021
Debt Instrument [Line Items]
Interest rate, basis spread	5.25%
LIBOR | Payment on or after January 2022
Debt Instrument [Line Items]
Interest rate, basis spread	7.75%

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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