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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
	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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