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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, 2022
Dec. 31, 2021
Credit Reserve    
Beginning balance $ 27,555  
Ending Balance 28,739 $ 27,555
Unamortized Discount, Net    
Beginning balance 76,023  
Ending Balance 61,650 76,023
Residential    
Credit Reserve    
Beginning balance 27,555 44,967
Amortization of net discount 0 0
Realized credit recoveries (losses), net 471 (707)
Acquisitions 0 2,825
Sales, calls, other (842) (1,328)
Transfers to (release of) credit reserves, net 1,555 (18,202)
Ending Balance 28,739 27,555
Unamortized Discount, Net    
Beginning balance 76,023 95,718
Amortization of net discount (11,153) (23,254)
Realized credit recoveries (losses), net 0 0
Acquisitions 0 1,208
Sales, calls, other (1,665) (15,851)
Transfers to (release of) credit reserves, net (1,555) 18,202
Ending Balance $ 61,650 $ 76,023