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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, 2017
Sep. 30, 2017
Credit Reserve    
Beginning balance $ 47,588 $ 47,473
Amortization of net discount 0 0
Realized credit losses (795) (3,232)
Acquisitions 1,665 8,256
Sales, calls, other (144) (3,405)
Impairments 3 248
Transfers to (release of) credit reserves, net (1,442) (2,465)
Ending Balance 46,875 46,875
Unamortized Discount, Net    
Beginning balance 192,063 198,112
Amortization of net discount (4,631) (14,697)
Realized credit losses 0 0
Acquisitions 2,732 11,375
Sales, calls, other (2,214) (7,863)
Impairments 0 0
Transfers to (release of) credit reserves, net 1,442 2,465
Ending Balance $ 189,392 $ 189,392