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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
Jun. 30, 2018
Jun. 30, 2018
Credit Reserve    
Beginning balance $ 40,616 $ 46,549
Amortization of net discount 0 0
Realized credit losses (385) (1,341)
Acquisitions 2,251 4,787
Sales, calls, other (299) (1,066)
Impairments 56 56
(Release of) transfers to credit reserves, net (48) (6,794)
Ending Balance 42,191 42,191
Unamortized Discount, Net    
Beginning balance 178,302 183,753
Amortization of net discount (3,848) (7,908)
Realized credit losses 0 0
Acquisitions 495 2,130
Sales, calls, other (4,907) (14,679)
Impairments 0 0
(Release of) transfers to credit reserves, net 48 6,794
Ending Balance $ 170,090 $ 170,090