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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, 2022
Sep. 30, 2022
Credit Reserve    
Beginning balance $ 1,771 $ 0
Sales, calls, other 0 0
Ending Balance 2,315 2,315
Unamortized Discount, Net    
Beginning balance   76,023
Ending Balance 61,015 61,015
Residential    
Credit Reserve    
Beginning balance 30,619 27,555
Amortization of net discount 0 0
Realized credit recoveries (losses), net 170 244
Acquisitions 0 0
Sales, calls, other 0 (343)
Transfers to (release of) credit reserves, net (542) 2,791
Ending Balance 30,247 30,247
Unamortized Discount, Net    
Beginning balance 61,303 76,023
Amortization of net discount (830) (10,647)
Realized credit recoveries (losses), net 0 0
Acquisitions 0 0
Sales, calls, other 0 (1,570)
Transfers to (release of) credit reserves, net 542 (2,791)
Ending Balance $ 61,015 $ 61,015