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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, 2021
Jun. 30, 2021
Credit Reserve    
Beginning balance $ 13 $ 388
Sales, calls, other 0 0
Ending Balance 0 0
Unamortized Discount, Net    
Beginning balance   95,718
Ending Balance 90,216 90,216
Residential    
Credit Reserve    
Beginning balance 44,947 44,967
Amortization of net discount 0 0
Realized credit losses (112) (249)
Acquisitions 890 2,825
Sales, calls, other (718) (992)
Transfers to (release of) credit reserves, net (4,658) (6,202)
Ending Balance 40,349 40,349
Unamortized Discount, Net    
Beginning balance 94,188 95,718
Amortization of net discount (1,569) (3,183)
Realized credit losses 0 0
Acquisitions 368 1,208
Sales, calls, other (7,429) (9,729)
Transfers to (release of) credit reserves, net 4,658 6,202
Ending Balance $ 90,216 $ 90,216