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Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014
Derivatives |  |
Beginning balance | $ (379) | [1]
Principal paydowns |  | [1]
Discount accretion |  | [1]
Gains (losses) in net income, net | 6,434 | [1]
Unrealized gains in OCI, net |  | [1]
Acquisitions |  | [1]
Sales |  | [1]
Other settlements, net | (5,204) | [1]
Ending balance | 851 | [1]
Commercial Secured Borrowings |  |
Liabilities |  |
Principal paydowns | (1,081) |
Discount accretion |  |
Gains (losses) in net income, net | 2,179 |
Unrealized gains in OCI, net |  |
Acquisitions | 65,048 |
Sales |  |
Other settlements, net |  |
Ending balance | 66,146 |
Residential Loans at Fair Value |  |
Assets |  |
Beginning balance | 391,100 |
Principal paydowns | (20,728) |
Gains (losses) in net income, net | 35,971 |
Acquisitions | 3,557,753 |
Sales | (2,621,349) |
Other settlements, net | (2,314) |
Ending balance | 1,340,433 |
Commercial Loans |  |
Assets |  |
Beginning balance | 89,111 |
Principal paydowns | (3,684) |
Gains (losses) in net income, net | 14,986 |
Acquisitions | 611,624 |
Sales | (536,671) |
Other settlements, net | 55 |
Ending balance | 175,421 |
Trading Securities |  |
Assets |  |
Beginning balance | 124,555 |
Principal paydowns | (5,848) |
Gains (losses) in net income, net | (15,041) |
Acquisitions | 66,253 |
Sales | (61,169) |
Ending balance | 108,750 |
Available-for-sale Securities |  |
Assets |  |
Beginning balance | 1,558,306 |
Principal paydowns | (138,751) |
Discount accretion | 32,774 |
Gains (losses) in net income, net | 9,389 |
Unrealized gains in OCI, net | 28,328 |
Acquisitions | 192,151 |
Sales | (395,962) |
Ending balance | 1,286,235 |
Mortgage Servicing Rights |  |
Assets |  |
Beginning balance | 64,824 |
Gains (losses) in net income, net | (5,944) |
Acquisitions | 76,272 |
Ending balance | $ 135,152 |
[1] | For the purpose of this presentation, derivative assets and liabilities, which consist of loan purchase commitments, are presented net.

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