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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, 2021
Sep. 30, 2021
Credit Reserve    
Beginning balance $ 0 $ 388
Sales, calls, other 0 0
Ending Balance 0 0
Unamortized Discount, Net    
Beginning balance   95,718
Ending Balance 88,108 88,108
Residential    
Credit Reserve    
Beginning balance 40,349 44,967
Amortization of net discount 0 0
Realized credit losses (184) (433)
Acquisitions 0 2,825
Sales, calls, other (320) (1,312)
Transfers to (release of) credit reserves, net (10,397) (16,599)
Ending Balance 29,448 29,448
Unamortized Discount, Net    
Beginning balance 90,216 95,718
Amortization of net discount (6,437) (9,620)
Realized credit losses 0 0
Acquisitions 0 1,208
Sales, calls, other (6,068) (15,797)
Transfers to (release of) credit reserves, net 10,397 16,599
Ending Balance $ 88,108 $ 88,108