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Real Estate Securities - Schedule of Changes in Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Credit Reserve    
Beginning balance $ 28,739  
Ending Balance 23,436 $ 28,739
Unamortized Discount, Net    
Beginning balance 61,650  
Ending Balance 46,885 61,650
Residential    
Credit Reserve    
Beginning balance 28,739 27,555
Amortization of net discount 0 0
Realized credit recoveries (losses), net 158 471
Acquisitions 1,106 0
Sales, calls, other (5,331) (842)
Transfers to (release of) credit reserves, net (1,236) 1,555
Ending Balance 23,436 28,739
Unamortized Discount, Net    
Beginning balance 61,650 76,023
Amortization of net discount (1,170) (11,153)
Realized credit recoveries (losses), net 0 0
Acquisitions 754 0
Sales, calls, other (15,585) (1,665)
Transfers to (release of) credit reserves, net 1,236 (1,555)
Ending Balance $ 46,885 $ 61,650