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Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income, Net of Tax) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 140,434us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ 238,048us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ 247,734us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income (loss) before reclassification	21,298us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	(75,195)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	14,669us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
Amounts reclassified from accumulated other comprehensive income (loss)	(19,918)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	(22,419)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	(24,355)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Net other comprehensive income (loss) during period	1,380us-gaap_OtherComprehensiveIncomeLossNetOfTax	(97,614)us-gaap_OtherComprehensiveIncomeLossNetOfTax	(9,686)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Ending Balance	141,814us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	140,434us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	238,048us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Securities Available For Sale [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	146,672us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember	245,539us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember	227,052us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember
Other comprehensive income (loss) before reclassification	43,942us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember	(98,103)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember	21,291us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember
Amounts reclassified from accumulated other comprehensive income (loss)	(25)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember	(764)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember	(2,804)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember
Net other comprehensive income (loss) during period	43,917us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember	(98,867)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember	18,487us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember
Ending Balance	190,589us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember	146,672us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember	245,539us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember
Defined Benefit Plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(26,131)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	(49,071)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	(42,958)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Other comprehensive income (loss) before reclassification	(22,644)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	22,940us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	(6,113)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Amounts reclassified from accumulated other comprehensive income (loss)	0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Net other comprehensive income (loss) during period	(22,644)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	22,940us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	(6,113)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Ending Balance	(48,775)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	(26,131)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	(49,071)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	19,893us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	41,580us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	63,640us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Other comprehensive income (loss) before reclassification	0us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	(32)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	(509)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Amounts reclassified from accumulated other comprehensive income (loss)	(19,893)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	(21,655)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	(21,551)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Net other comprehensive income (loss) during period	(19,893)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	(21,687)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	(22,060)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Ending Balance	$ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	$ 19,893us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember	$ 41,580us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember

X

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580



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-Number 210

-Section 02

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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