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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Detail) - Residential - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Credit Reserve    
Beginning balance $ 48,547 $ 48,869
Amortization of net discount 0 0
Realized credit losses (1,113) (3,068)
Acquisitions 862 5,245
Sales, calls, other (130) (4,382)
Transfers to (release of) credit reserves, net (3,528) (2,026)
Ending Balance 44,943 44,943
Unamortized Discount Net    
Beginning balance 219,630 237,107
Amortization of net discount (6,339) (14,407)
Realized credit losses 0 0
Acquisitions 926 6,036
Sales, calls, other (10,171) (23,188)
Transfers to (release of) credit reserves, net 3,528 2,026
Ending Balance $ 207,574 $ 207,574