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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
Credit Reserve  
Beginning balance $ 0
Sales, calls, other 0
Ending Balance 1,525
Unamortized Discount, Net  
Beginning balance 124,255
Ending Balance 109,538
Residential  
Credit Reserve  
Beginning balance 32,940
Amortization of net discount 0
Realized credit losses (519)
Acquisitions 5,184
Sales, calls, other (206)
(Release of) transfers to credit reserves, net 318
Ending Balance 37,717
Unamortized Discount, Net  
Beginning balance 124,255
Amortization of net discount (1,754)
Realized credit losses 0
Acquisitions 777
Sales, calls, other (13,422)
(Release of) transfers to credit reserves, net (318)
Ending Balance $ 109,538