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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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Credit Reserve    
Beginning balance $ 46,549 $ 47,473
Amortization of net discount 0 0
Realized credit losses (2,165) (4,187)
Acquisitions 6,315 9,118
Sales, calls, other (1,850) (3,404)
Impairments 89 1,011
Transfers to (release of) credit reserves, net (7,568) (3,462)
Ending Balance 41,370 46,549
Unamortized Discount, Net    
Beginning balance 183,753 198,112
Amortization of net discount (14,098) (18,795)
Realized credit losses 0 0
Acquisitions 2,716 13,080
Sales, calls, other (28,739) (12,106)
Impairments 0 0
Transfers to (release of) credit reserves, net 7,568 3,462
Ending Balance $ 151,200 $ 183,753