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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, 2018
Sep. 30, 2018
Credit Reserve    
Beginning balance $ 42,191 $ 46,549
Amortization of net discount 0 0
Realized credit losses (616) (1,957)
Acquisitions 637 5,424
Sales, calls, other (777) (1,843)
Impairments 33 89
(Release of) transfers to credit reserves, net (394) (7,188)
Ending Balance 41,074 41,074
Unamortized Discount, Net    
Beginning balance 170,090 183,753
Amortization of net discount (3,323) (11,231)
Realized credit losses 0 0
Acquisitions 224 2,354
Sales, calls, other (6,586) (21,265)
Impairments 0 0
(Release of) transfers to credit reserves, net 394 7,188
Ending Balance $ 160,799 $ 160,799