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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
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Credit Reserve    
Beginning balance $ 2,639 $ 2,540
Sales, calls, other 131 308
Ending Balance 2,573 2,573
Unamortized Discount, Net    
Beginning balance   61,650
Ending Balance 46,603 46,603
Residential    
Credit Reserve    
Beginning balance 25,615 28,739
Amortization of net discount 0 0
Realized credit recoveries (losses), net 101 106
Acquisitions 0 1,106
Sales, calls, other (1,207) (5,331)
Transfers to (release of) credit reserves, net (619) (730)
Ending Balance 23,890 23,890
Unamortized Discount, Net    
Beginning balance 46,948 61,650
Amortization of net discount (296) (946)
Realized credit recoveries (losses), net 0 0
Acquisitions 0 754
Sales, calls, other (668) (15,585)
Transfers to (release of) credit reserves, net 619 730
Ending Balance $ 46,603 $ 46,603