Statement of Comprehensive Income Statement (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Income before income tax expense	$ 339,894	$ 263,191	$ 189,799
Total income tax expense	101,943us-gaap_IncomeTaxExpenseBenefit	79,507us-gaap_IncomeTaxExpenseBenefit	55,693us-gaap_IncomeTaxExpenseBenefit
Net income	237,951us-gaap_NetIncomeLoss	183,684us-gaap_NetIncomeLoss	134,106us-gaap_NetIncomeLoss
Changes in unrealized securities' holding gains/(losses), Pre-Tax	38,864	(130,947)	(6,668)
Changes in unrealized securities' holding gains/(losses), Tax	13,602	(45,833)	(2,334)
Changes in unrealized securities' holding gains/(losses), After-tax	25,262	(85,114)	(4,334)
Changes in unrealized securities' holding gains/(losses) that result from securities being transferred into available-for-sale from held-to-maturity, Pre-Tax	(2,157)	(2,187)	13,059
Changes in unrealized securities' holding gains/(losses) that result from securities being transferred into available-for-sale from held-to-maturity, Tax	(753)	(765)	4,571
Changes in unrealized securities' holding gains/(losses) that result from securities being transferred into available-for-sale from held-to-maturity, After-tax	(1,404)	(1,422)	8,488
Net losses/(gains) realized on sale of securities reclassified to noninterest income, Pre-Tax	(166)	2,803	(3,786)
Net losses/(gains) realized on sale of securities reclassified to noninterest income, Tax	(58)	981	(1,325)
Net losses/(gains) realized on sale of securities reclassified to noninterest income, After-tax	(108)	1,822	(2,461)
Net change in unrealized gains/(losses) on securities available for sale, Pre-Tax	36,541	(130,331)	2,605
Net change in unrealized gains/(losses) on securities available for sale, Tax	12,791	(45,617)	912
Net change in unrealized gains/(losses) on securities available for sale, After-tax	23,750	(84,714)	1,693
Net gains/(losses) arising during the period, Pre-Tax	(49,552)	47,939	(1,224)
Net gains/(losses) arising during the period, Tax	(17,344)	16,779	(429)
Net gains/(losses) arising during the period, After-tax	(32,208)	31,160	(795)
Amortization of actuarial gain, Pre-Tax	3,166	4,437	10,517
Amortization of actuarial gain, Tax	1,108	1,553	3,681
Amortization of actuarial gain, After-tax	2,058	2,884	6,836
Amortization of prior service cost reclassified to other noninterest expense, Pre-Tax	2,131	(1)	(80)
Amortization of prior service cost reclassified to other noninterest expense, Tax	747	0	(28)
Amortization of prior service cost reclassified to other noninterest expense, After-tax	1,384	(1)	(52)
Net change from defined benefit pension plans, Pre-Tax	(44,255)	52,375	9,213
Net change from defined benefit pension plans, Tax	(15,489)	18,332	3,224
Net change from defined benefit pension plans, After-tax	(28,766)	34,043	5,989
Total other comprehensive gains/(losses), Pre-Tax	(7,714)	(77,956)	11,818
Total other comprehensive gains/(losses), Tax	(2,698)us-gaap_OtherComprehensiveIncomeLossTax	(27,285)us-gaap_OtherComprehensiveIncomeLossTax	4,136us-gaap_OtherComprehensiveIncomeLossTax
Total other comprehensive gains/(losses), After-tax	(5,016)	(50,671)	7,682
Comprehensive income, Pre-Tax	332,180	185,235	201,617
Comprehensive income, Tax	99,245	52,222	59,829
Comprehensive income, After-tax	$ 232,935us-gaap_ComprehensiveIncomeNetOfTax	$ 133,013us-gaap_ComprehensiveIncomeNetOfTax	$ 141,788us-gaap_ComprehensiveIncomeNetOfTax

Other Comprehensive Income, Defined benefit plan, amortization of actuarial gains, after tax

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Other Comp Income, Defined benefit plan, amortization of actuarial gains, before tax

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Other comp income, Defined Benefit Plan, Amortization of Actuarial Gains, tax

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The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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