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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	6 Months Ended
	Jun. 30, 2014
Derivatives
Beginning balance	$ (379)	[1]
Principal paydowns		[1]
Gains (losses) in net income, net	5,108	[1]
Unrealized gains in OCI, net		[1]
Acquisitions		[1]
Sales		[1]
Other settlements, net	(3,067)	[1]
Ending Balance	1,662	[1]
Commercial Secured Borrowings
Liabilities
Principal paydowns	(115)
Gains (losses) in net income, net	1,759
Unrealized gains in OCI, net
Acquisitions	65,048
Sales
Other settlements, net
Ending Balance	66,692
Residential Loans at Fair Value
Assets
Beginning balance	391,100
Principal paydowns	(11,563)
Gains (losses) in net income, net	21,849
Acquisitions	1,717,244
Sales	(1,269,330)
Other settlements, net	(2,736)
Ending Balance	846,564
Commercial Loans
Assets
Beginning balance	89,111
Principal paydowns	(3,463)
Gains (losses) in net income, net	11,099
Acquisitions	271,424
Sales	(246,053)
Ending Balance	122,118
Trading Securities
Assets
Beginning balance	124,555
Principal paydowns	(2,714)
Gains (losses) in net income, net	(13,133)
Acquisitions	64,573
Ending Balance	173,281
Available-for-sale Securities
Assets
Beginning balance	1,558,306
Principal paydowns	(92,590)
Gains (losses) in net income, net	23,485
Unrealized gains in OCI, net	32,888
Acquisitions	151,010
Sales	(1,313)
Ending Balance	1,671,786
Mortgage Servicing Rights
Assets
Beginning balance	64,824
Gains (losses) in net income, net	(8,265)
Acquisitions	14,666
Ending Balance	$ 71,225
[1] For the purpose of this presentation, derivative assets and liabilities, which consist of loan purchase commitments, are presented net.

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