Fair Value of Financial Instruments Level 3 (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Non-Agency MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	$ 798
Change in fair value	36	[1]
Principal payments	(102)
Balance at the end of the period	706
Non-Agency MBS | Accretion (amortization)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accretion (amortization)	46
Loans Receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	4,268
Change in fair value	(7)	[1]
Principal payments	(512)
Balance at the end of the period	3,757
Loans Receivable | Accretion (amortization)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accretion (amortization)	$ (6)

[1] Change in fair value for mortgage loans is recorded within “unrealized gain (loss) on investments, net” in net income and change in fair value for other non-Agency MBS is recorded as unrealized gain (loss) in “other comprehensive income.”