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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, 2016
Sep. 30, 2016
Credit Reserve    
Beginning balance $ 44,943 $ 48,869
Amortization of net discount 0 0
Realized credit losses (329) (3,397)
Acquisitions 2,136 7,381
Sales, calls, other 0 (4,382)
Impairments 0 305
Transfers to (release of) credit reserves, net 863 (1,163)
Ending Balance 47,613 47,613
Unamortized Discount, Net    
Beginning balance 207,574 237,107
Amortization of net discount (6,124) (20,531)
Realized credit losses 0 0
Acquisitions 2,982 9,018
Sales, calls, other (843) (24,031)
Impairments 0 0
Transfers to (release of) credit reserves, net (863) 1,163
Ending Balance $ 202,726 $ 202,726