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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Credit Reserve    
Beginning balance $ 44,967  
Ending Balance 27,555 $ 44,967
Unamortized Discount, Net    
Beginning balance 95,718  
Ending Balance 76,023 95,718
Residential    
Credit Reserve    
Beginning balance 44,967 32,940
Amortization of net discount 0 0
Realized credit losses (707) (2,282)
Acquisitions 2,825 7,248
Sales, calls, other (1,328) (731)
Impairments 0 0
Transfers to (release of) credit reserves, net (18,202) 7,792
Ending Balance 27,555 44,967
Unamortized Discount, Net    
Beginning balance 95,718 124,255
Amortization of net discount (23,254) (6,538)
Realized credit losses 0 0
Acquisitions 1,208 2,634
Sales, calls, other (15,851) (16,841)
Impairments 0 0
Transfers to (release of) credit reserves, net 18,202 (7,792)
Ending Balance $ 76,023 $ 95,718