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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, 2019
USD ($)
Credit Reserve  
Beginning balance $ 41,370
Amortization of net discount 0
Realized credit losses (166)
Acquisitions 677
Sales, calls, other (6,392)
(Release of) transfers to credit reserves, net (655)
Ending Balance 34,834
Unamortized Discount, Net  
Beginning balance 151,200
Amortization of net discount (1,930)
Realized credit losses 0
Acquisitions 354
Sales, calls, other (8,266)
(Release of) transfers to credit reserves, net 655
Ending Balance $ 142,013