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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, 2018
USD ($)
Credit Reserve  
Beginning balance $ 46,549
Amortization of net discount 0
Realized credit losses (956)
Acquisitions 2,536
Sales, calls, other (767)
Transfers to (release of) credit reserves, net (6,746)
Ending Balance 40,616
Unamortized Discount, Net  
Beginning balance 183,753
Amortization of net discount (4,060)
Realized credit losses 0
Acquisitions 1,635
Sales, calls, other (9,772)
Transfers to (release of) credit reserves, net 6,746
Ending Balance $ 178,302