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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
Credit Reserve  
Beginning balance $ 0
Sales, calls, other 0
Ending Balance 705
Unamortized Discount, Net  
Beginning balance 76,023
Ending Balance 63,206
Residential  
Credit Reserve  
Beginning balance 27,555
Amortization of net discount 0
Realized credit losses (88)
Acquisitions 0
Sales, calls, other (343)
Transfers to (release of) credit reserves, net 2,777
Ending Balance 29,901
Unamortized Discount, Net  
Beginning balance 76,023
Amortization of net discount (8,470)
Realized credit losses 0
Acquisitions 0
Sales, calls, other (1,570)
Transfers to (release of) credit reserves, net (2,777)
Ending Balance $ 63,206