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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 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Credit Reserve    
Beginning balance $ 47,473 $ 47,473
Amortization of net discount 0 0
Realized credit losses (1,521) (2,437)
Acquisitions 872 6,591
Sales, calls, other (1,101) (3,261)
Impairments 128 245
Transfers to (release of) credit reserves, net (16) (1,023)
Ending Balance 49,226 47,588
Unamortized Discount, Net    
Beginning balance 198,112 198,112
Amortization of net discount (4,805) (10,066)
Realized credit losses 0 0
Acquisitions 884 8,643
Sales, calls, other (963) (5,649)
Impairments 0 0
Transfers to (release of) credit reserves, net 16 1,023
Ending Balance $ 196,931 $ 192,063