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Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | $ 141,814 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ 140,434 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income (loss) before reclassifications | 18,453 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax | 8,388 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
Amounts reclassified from accumulated other comprehensive income (loss) | (148)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax | (6,074)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Other comprehensive income (loss), net of tax | 18,305 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 2,314 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Ending Balance | 160,119 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 142,748 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Securities Available For Sale [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | 190,589 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember | 146,672 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember
Other comprehensive income (loss) before reclassifications | 17,316 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember | 7,951 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember
Amounts reclassified from accumulated other comprehensive income (loss) | (148)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember
Other comprehensive income (loss), net of tax | 17,168 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember | 7,951 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember
Ending Balance | 207,757 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember | 154,623 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AvailableforsaleSecuritiesMember
Defined Benefit Plans [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | (48,775)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (26,131)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Other comprehensive income (loss) before reclassifications | 1,137 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 437 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Amounts reclassified from accumulated other comprehensive income (loss) | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Other comprehensive income (loss), net of tax | 1,137 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 437 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Ending Balance | (47,638)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (25,694)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Derivatives [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | 0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember | 19,893 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Other comprehensive income (loss) before reclassifications | 0 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember | 0 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Amounts reclassified from accumulated other comprehensive income (loss) | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember | (6,074)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Other comprehensive income (loss), net of tax | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember | (6,074)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember
Ending Balance | $ 0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember | $ 13,819 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_DerivativeMember

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- 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=36458714&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + 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=36458714&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581 + Details
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