Changes in level 3 assets and liabilities measured at fair value on a recurring basis (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 159,186	$ 180,773
Gains (Losses) included in earnings	(4,942)	(8,361)
Gains (losses) included in OCI	0	(42)
Additions	5,507	3,941
Sales	(124)	(1,109)
Settlements	(161)	(717)
Ending Balance	159,466	174,485
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	(645)	(3,190)
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance	(133,634)	(128,299)
Gains (Losses) included in earnings	4,164	1,168
Gains (losses) included in OCI	0	0
Additions	0	0
Sales	0	0
Settlements	0	786
Ending Balance	(129,470)	(126,345)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss	4,164	1,168
Other Liabilities Member \| Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Contingent Liability [Member]
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance	(133,634)	(128,299)
Gains (Losses) included in earnings	4,164	1,168
Gains (losses) included in OCI	0	0
Additions	0	0
Sales	0	0
Settlements	0	786
Ending Balance	(129,470)	(126,345)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss	4,164	1,168
Available For Sale Securities Member \| Collateralized Mortgage Backed Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	1,325	6,523
Gains (Losses) included in earnings	(8)	(2)
Gains (losses) included in OCI	0	(42)
Additions	118	0
Sales	0	0
Settlements	0	(100)
Ending Balance	1,435	6,379
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	0	0
Trading Account Assets[Member] \| Collateralized Mortgage Backed Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	6,229	9,799
Gains (Losses) included in earnings	16	(39)
Gains (losses) included in OCI	0	0
Additions	130	150
Sales	(80)	(1,109)
Settlements	(74)	(500)
Ending Balance	6,221	8,301
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	18	(25)
Trading Account Assets[Member] \| Collateralized Mortgage Obligations Member
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	1,375	1,423
Gains (Losses) included in earnings	(2)	(10)
Gains (losses) included in OCI	0	0
Additions	0	263
Sales	(44)	0
Settlements	(87)	(115)
Ending Balance	1,242	1,561
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	(2)	(6)
Trading Account Assets[Member] \| Other Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	1,563	1,929
Gains (Losses) included in earnings	(19)	(214)
Gains (losses) included in OCI	0	0
Additions	0	0
Sales	0	0
Settlements	0	0
Ending Balance	1,544	1,715
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	23	(136)
Mortgage Servicing Rights Member
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	148,694	161,099
Gains (Losses) included in earnings	(4,929)	(8,096)
Gains (losses) included in OCI	0	0
Additions	5,259	3,528
Sales	0	0
Settlements	0	(2)
Ending Balance	149,024	156,529
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	$ (684)	$ (3,023)

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Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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