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Fair Value of Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Commercial Secured Borrowings |  |
Derivatives |  |
Ending balance | $ 63,152 |
Liabilities |  |
Beginning balance | 66,707 | $ 0
Transfer to FVO | 0 |
Acquisitions | 0 | 65,048
Sales | 0 | 0
Principal paydowns | (593) | (374)
Amortization income |  | 0
Gains (losses) in net income, net | (3,011) | 2,033
Unrealized gains in OCI, net | 0 | 0
Other settlements, net | 49 | 0
Ending Balance | 63,152 | 66,707
Asset-backed Securities |  |
Assets |  |
Unrealized gains in OCI, net | 0 |
Derivatives |  |
Ending balance | 996,820 |
Liabilities |  |
Beginning balance | 0 |
Transfer to FVO | 1,302,216 |
Acquisitions | 0 |
Sales | (1,362) |
Principal paydowns | (312,800) |
Gains (losses) in net income, net | 8,366 |
Other settlements, net | 400 |
Ending Balance | 996,820 | 0
Residential Loans at Fair Value |  |
Assets |  |
Beginning balance | 1,677,984 | 391,100
Transfer to FVO | 1,370,699 |
Acquisitions | 5,231,532 | 5,020,988
Sales | (3,857,807) | (3,746,417)
Principal paydowns | (612,473) | (42,657)
Amortization income |  | 0
Gains (losses) in net income, net | (6,071) | 56,835
Unrealized gains in OCI, net | 0 | 0
Other settlements, net | (6,313) | (1,865)
Ending Balance | 3,797,551 | 1,677,984
Commercial Loans |  |
Assets |  |
Beginning balance | 237,496 | 89,111
Transfer to FVO | 0 |
Acquisitions | 617,519 | 937,594
Sales | (754,636) | (807,931)
Principal paydowns | (780) | (4,157)
Amortization income |  | 0
Gains (losses) in net income, net | 7,199 | 22,824
Unrealized gains in OCI, net | 0 | 0
Other settlements, net | 0 | 55
Ending Balance | 106,798 | 237,496
Trading Securities |  |
Assets |  |
Beginning balance | 111,606 | 124,555
Transfer to FVO | 0 |
Acquisitions | 399,990 | 81,545
Sales | (83,038) | (64,393)
Principal paydowns | (7,245) | (5,934)
Amortization income |  | 0
Gains (losses) in net income, net | (17,302) | (24,167)
Unrealized gains in OCI, net | 0 | 0
Other settlements, net | 0 | 0
Ending Balance | 404,011 | 111,606
Available-for-sale Securities |  |
Assets |  |
Beginning balance | 1,267,624 | 1,558,306
Transfer to FVO | 0 |
Acquisitions | 33,370 | 237,499
Sales | (366,373) | (440,361)
Principal paydowns | (131,387) | (168,308)
Amortization income |  | 32,774
Gains (losses) in net income, net | 72,612 | 23,412
Unrealized gains in OCI, net | (46,961) | 24,302
Other settlements, net | 360 | 0
Ending Balance | 829,245 | 1,267,624
Mortgage Servicing Rights |  |
Assets |  |
Beginning balance | 139,293 | 64,824
Transfer to FVO | 0 |
Acquisitions | 95,281 | 95,550
Sales | (18,206) | 0
Principal paydowns | 0 | 0
Amortization income |  | 0
Gains (losses) in net income, net | (24,392) | (21,081)
Unrealized gains in OCI, net | 0 | 0
Other settlements, net | 0 | 0
Ending Balance | 191,976 | 139,293
Derivatives |  |
Ending balance | 191,976 |
Guarantee Asset |  |
Assets |  |
Beginning balance | 7,201 | 0
Transfer to FVO | 0 |
Acquisitions | 0 | 7,201
Sales | 0 | 0
Principal paydowns | 0 | 0
Amortization income |  | 0
Gains (losses) in net income, net | (1,377) | 0
Unrealized gains in OCI, net | 0 | 0
Other settlements, net | (127) | 0
Ending Balance | 5,697 | 7,201
Derivative Assets |  |
Assets |  |
Beginning balance | 1,119 |
Transfer to FVO | 0 |
Acquisitions | 0 |
Sales | 0 |
Principal paydowns | 0 |
Gains (losses) in net income, net | 60,823 |
Unrealized gains in OCI, net | 0 |
Other settlements, net | (58,734) |
Ending Balance | 3,208 | 1,119
Derivatives |  |
Beginning balance | $ 1,119 | (379)
Acquisitions |  | 0
Sales |  | 0
Principal paydowns |  | 0
Amortization income |  | 0
Gains (losses) in net income, net |  | 14,527
Unrealized gains in OCI, net |  | 0
Other settlements, net |  | (13,029)
Ending balance |  | $ 1,119

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