Income Taxes - Components of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Included in net income
Current federal	$ 41,441us-gaap_CurrentFederalTaxExpenseBenefit	$ 14,797us-gaap_CurrentFederalTaxExpenseBenefit	$ 11,195us-gaap_CurrentFederalTaxExpenseBenefit
Current state	1,487	(3,207)	1,953
Total current provision	42,928us-gaap_CurrentIncomeTaxExpenseBenefit	11,590us-gaap_CurrentIncomeTaxExpenseBenefit	13,148us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred federal	21,483	37,403	34,219
Deferred state	2,054	3,517	(1,754)
Total deferred provision	23,537us-gaap_DeferredIncomeTaxExpenseBenefit	40,920us-gaap_DeferredIncomeTaxExpenseBenefit	32,465us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense	66,465us-gaap_IncomeTaxExpenseBenefit	52,510us-gaap_IncomeTaxExpenseBenefit	45,613us-gaap_IncomeTaxExpenseBenefit
Included in shareholders' equity
Deferred tax related to retirement benefits	(14,681)	32,749	3,788
Deferred tax related to securities	6,857	(40,876)	(1,583)
Deferred tax related to derivatives and hedging	(217)	116	(75)
Total included in shareholders' equity	$ (8,041)	$ (8,011)	$ 2,130

Deferred Tax Included In Shareholders Equity

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses on available-for-sale securities.

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