Fair Value of Financial Instruments Level 3 (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)		Sep. 30, 2021 USD ($)
Measurement Input, Prepayment Rate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Debt Securities, Available-for-sale, Measurement Input	0.10		0.10
Loans Held-for-sale, Measurement Input	0.10		0.10
Measurement Input, Default Rate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Debt Securities, Available-for-sale, Measurement Input	0.02		0.02
Loans Held-for-sale, Measurement Input	0.02		0.02
Measurement Input, Loss Severity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Debt Securities, Available-for-sale, Measurement Input	0.20		0.20
Loans Held-for-sale, Measurement Input	0.20		0.20
Measurement Input, Discount Rate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Debt Securities, Available-for-sale, Measurement Input	0.070		0.070
Loans Held-for-sale, Measurement Input	0.070		0.070
Non-Agency MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	$ 1,002		$ 1,275
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(47)	[1]	(151)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(109)		(412)
Balance at the end of the period	906		906
Loans Receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	5,146		6,264
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(34)	[1]	(102)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(457)		(1,629)
Balance at the end of the period	4,717		4,717
Interest Income | Non-Agency MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accretion (amortization)	60		194
Interest Income | Loans Receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accretion (amortization)	$ (6)		$ (20)

[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”.