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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Credit Reserve    
Beginning balance $ 2,568 $ 2,540
Sales, calls, other 177 177
Ending Balance 2,639 2,639
Unamortized Discount, Net    
Beginning balance   61,650
Ending Balance 46,948 46,948
Residential    
Credit Reserve    
Beginning balance 28,208 28,739
Amortization of net discount 0 0
Realized credit recoveries (losses), net 53 5
Acquisitions 1,106 1,106
Sales, calls, other (3,918) (4,124)
Transfers to (release of) credit reserves, net 166 (111)
Ending Balance 25,615 25,615
Unamortized Discount, Net    
Beginning balance 59,334 61,650
Amortization of net discount (387) (650)
Realized credit recoveries (losses), net 0 0
Acquisitions 754 754
Sales, calls, other (12,587) (14,917)
Transfers to (release of) credit reserves, net (166) 111
Ending Balance $ 46,948 $ 46,948