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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, 2021
USD ($)
Credit Reserve  
Beginning balance $ 388
Sales, calls, other 0
Ending Balance 13
Unamortized Discount, Net  
Beginning balance 95,718
Ending Balance 94,188
Residential  
Credit Reserve  
Beginning balance 44,967
Amortization of net discount 0
Realized credit losses (137)
Acquisitions 1,935
Sales, calls, other (274)
Transfers to (release of) credit reserves, net (1,544)
Ending Balance 44,947
Unamortized Discount, Net  
Beginning balance 95,718
Amortization of net discount (1,614)
Realized credit losses 0
Acquisitions 840
Sales, calls, other (2,300)
Transfers to (release of) credit reserves, net 1,544
Ending Balance $ 94,188