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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Credit Reserve    
Beginning balance $ 41,370  
Ending Balance 32,940 $ 41,370
Unamortized Discount, Net    
Beginning balance 151,200  
Ending Balance 124,255 151,200
Residential    
Credit Reserve    
Beginning balance 41,370 46,549
Amortization of net discount 0 0
Realized credit losses (2,606) (2,165)
Acquisitions 3,712 6,315
Sales, calls, other (9,453) (1,850)
Impairments 0 89
Transfers to (release of) credit reserves, net (83) (7,568)
Ending Balance 32,940 41,370
Unamortized Discount, Net    
Beginning balance 151,200 183,753
Amortization of net discount (7,921) (14,098)
Realized credit losses 0 0
Acquisitions 1,910 2,716
Sales, calls, other (21,017) (28,739)
Impairments 0 0
Transfers to (release of) credit reserves, net 83 7,568
Ending Balance $ 124,255 $ 151,200