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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details) - Residential
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
Credit Reserve  
Beginning balance $ 47,473
Amortization of net discount 0
Realized credit losses (916)
Acquisitions 5,719
Sales, calls, other (2,160)
Impairments 117
Transfers to (release of) credit reserves, net (1,007)
Ending Balance 49,226
Unamortized Discount, Net  
Beginning balance 198,112
Amortization of net discount (5,261)
Realized credit losses 0
Acquisitions 7,759
Sales, calls, other (4,686)
Impairments 0
Transfers to (release of) credit reserves, net 1,007
Ending Balance $ 196,931