Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Credit Reserve
Beginning balance	$ 2,540
Sales, calls, other	0
Ending Balance	2,568
Unamortized Discount, Net
Beginning balance	61,650
Ending Balance	59,334
Residential
Credit Reserve
Beginning balance	28,739
Amortization of net discount	0
Realized credit recoveries (losses), net	(48)
Acquisitions	0
Sales, calls, other	(206)
Transfers to (release of) credit reserves, net	(277)
Ending Balance	28,208
Unamortized Discount, Net
Beginning balance	61,650
Amortization of net discount	(263)
Realized credit recoveries (losses), net	0
Acquisitions	0
Sales, calls, other	(2,330)
Transfers to (release of) credit reserves, net	277
Ending Balance	$ 59,334