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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Detail) - Jun. 30, 2015 - Residential - USD ($)
$ in Thousands
Total
Total
Credit Reserve    
Beginning balance $ 63,584 $ 70,067
Amortization of net discount 0 0
Realized credit losses (2,769) (5,714)
Acquisitions 858 858
Sales, calls, other 0 0
Impairments 0 0
Transfers to (release of) credit reserves, net 27 (3,511)
Ending Balance 61,700 61,700
Unamortized Discount Net    
Beginning balance 286,382 296,342
Amortization of net discount (9,324) (19,162)
Realized credit losses 0 0
Acquisitions 3,033 5,705
Sales, calls, other (6,945) (13,277)
Impairments 0 0
Transfers to (release of) credit reserves, net (27) 3,511
Ending Balance $ 273,119 $ 273,119