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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details) - Residential - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Credit Reserve    
Beginning balance $ 34,849 $ 41,370
Amortization of net discount 0 0
Realized credit losses (694) (1,874)
Acquisitions 734 2,198
Sales, calls, other (800) (7,197)
(Release of) transfers to credit reserves, net 122 (286)
Ending Balance 34,211 34,211
Unamortized Discount, Net    
Beginning balance 137,282 151,200
Amortization of net discount (1,834) (5,823)
Realized credit losses 0 0
Acquisitions 399 1,103
Sales, calls, other (3,071) (14,112)
(Release of) transfers to credit reserves, net (122) 286
Ending Balance $ 132,654 $ 132,654