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Investment Securities Available for Sale, at Fair Value - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Interest receivable	$ 2,100,000	$ 2,400,000
Contractual maturities (up to)	39 years
Weighted average life of available for sale securities portfolio	6 years	5 years 7 months 6 days
Allowance for credit loss	$ 0
Gross unrealized losses	(1,264,000)	$ (5,374,000)
Non-Agency RMBS
Schedule of Investments [Line Items]
Gross unrealized losses	(867,000)	$ (5,374,000)
CMBS
Schedule of Investments [Line Items]
Gross unrealized losses	$ (397,000)

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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