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Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Pre-Tax Amount    
Change in unrealized gains/losses on securities available-for-sale $ 4,983us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ 4,475us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax [1] (1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax [1]
Adjustment to funded status of employee benefit plans 729us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 212us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Other Comprehensive Income (Loss) 5,712us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent 4,686us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Tax (Expense) Benefit    
Change in unrealized gains/losses on securities available-for-sale (1,745)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (1,566)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax [1] 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax [1]
Adjustment to funded status of employee benefit plans (162)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax (74)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Other Comprehensive Income (Loss) (1,907)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 (1,640)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Net of Tax Amount    
Change in unrealized gains/losses on securities available-for-sale 3,238us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 2,909us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1] (1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1]
Adjustment to funded status of employee benefit plans 567us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 138us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other Comprehensive Income (Loss) $ 3,805us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent $ 3,046us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
[1] Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income (loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.