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Income Taxes (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Current [Abstract] |  |  |
Federal | $ 26,059,000 us-gaap_CurrentFederalTaxExpenseBenefit | $ 23,536,000 us-gaap_CurrentFederalTaxExpenseBenefit | $ 21,011,000 us-gaap_CurrentFederalTaxExpenseBenefit
State | 2,823,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 2,316,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 1,815,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current tax expense (benefit) | 28,882,000 us-gaap_CurrentIncomeTaxExpenseBenefit | 25,852,000 us-gaap_CurrentIncomeTaxExpenseBenefit | 22,826,000 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred [Abstract] |  |  |
Federal | 6,648,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 2,334,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (13,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State | 1,699,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 10,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 3,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred tax expense (benefit) | 8,347,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 2,344,000 us-gaap_DeferredIncomeTaxExpenseBenefit | (10,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense | 37,229,000 us-gaap_IncomeTaxExpenseBenefit | 28,196,000 us-gaap_IncomeTaxExpenseBenefit | 22,816,000 us-gaap_IncomeTaxExpenseBenefit
Income tax recorded to stockholders' equity | (1,100,000)us-gaap_OtherComprehensiveIncomeLossTax | 7,000,000 us-gaap_OtherComprehensiveIncomeLossTax | (100,000)us-gaap_OtherComprehensiveIncomeLossTax
Deferred tax assets [Abstract] |  |  |
Allowance for loan and lease losses | 25,689,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses | 26,729,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses |
Deferred compensation | 8,744,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation | 7,931,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation |
Postretirement benefit obligation | 2,377,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | 2,596,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits |
Unrealized losses on securities available for sale | 0 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross | 5,900,000 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross |
Accrued liabilities | 1,778,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 3,265,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities |
Stock-based compensation expense | 6,457,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 7,862,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |
Equipment leasing | 1,416,000 nbtb_DeferredTaxAssetsTaxDeferredExpenseEquipmentLeasingArrangements | 1,661,000 nbtb_DeferredTaxAssetsTaxDeferredExpenseEquipmentLeasingArrangements |
Other | 1,325,000 us-gaap_DeferredTaxAssetsOther | 2,125,000 us-gaap_DeferredTaxAssetsOther |
Total deferred tax assets | 47,786,000 us-gaap_DeferredTaxAssetsNet | 58,069,000 us-gaap_DeferredTaxAssetsNet |
Deferred tax liabilities [Abstract] |  |  |
Pension and executive retirement | 12,192,000 nbtb_DeferredTaxLiabilitiesPensionAndExecutiveRetirement | 17,417,000 nbtb_DeferredTaxLiabilitiesPensionAndExecutiveRetirement |
Fair value adjustments from acquisitions | 1,243,000 nbtb_DeferredTaxLiabilitiesFairValueAdjustmentsFromAcquisitions | 2,070,000 nbtb_DeferredTaxLiabilitiesFairValueAdjustmentsFromAcquisitions |
Unrealized gains on securities available for sale | 1,331,000 nbtb_DeferredTaxLiabilitiesUnrealizedGainsOnSecuritiesAvailableForSale | 0 nbtb_DeferredTaxLiabilitiesUnrealizedGainsOnSecuritiesAvailableForSale |
Premises and equipment, primarily due to accelerated depreciation | 2,491,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 2,270,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Deferred loan costs | 1,460,000 us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts | 1,624,000 us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts |
Intangible amortization | 14,162,000 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | 12,007,000 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets |
Other | 390,000 us-gaap_DeferredTaxLiabilitiesOther | 892,000 us-gaap_DeferredTaxLiabilitiesOther |
Total deferred tax liabilities | 33,269,000 us-gaap_DeferredTaxLiabilities | 36,280,000 us-gaap_DeferredTaxLiabilities |
Net deferred tax asset at year-end | 14,517,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | 21,789,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | 11,115,000 us-gaap_DeferredTaxAssetsLiabilitiesNet
Net deferred tax asset (liability) at beginning of year | 21,789,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | 11,115,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |
Increase in net deferred tax asset | (7,272,000)nbtb_DeferredTaxAssetsLiabilitiesNetDecreaseIncreaseInNetDeferredTaxLiability | 10,674,000 nbtb_DeferredTaxAssetsLiabilitiesNetDecreaseIncreaseInNetDeferredTaxLiability |
Reduction in unrecognized tax benefits resulting from expiration of statute of limitations of prior years' tax filings |  |  | (900,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Decrease in tax expense |  |  | (800,000)us-gaap_IncreaseDecreaseInIncomeTaxes
Federal statutory income tax rate (in hundredths) | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |
Income tax reconciliation [Abstract] |  |  |
Federal income tax at statutory rate | 39,306,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 31,482,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 27,081,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax exempt income | (2,250,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (2,433,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (2,536,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Net increase in CSV of life insurance | (1,734,000)nbtb_IncomeTaxReconciliationNetIncreaseInCashSurrenderValueOfLifeInsurance | (1,166,000)nbtb_IncomeTaxReconciliationNetIncreaseInCashSurrenderValueOfLifeInsurance | (908,000)nbtb_IncomeTaxReconciliationNetIncreaseInCashSurrenderValueOfLifeInsurance
Low income housing tax credits | (880,000)us-gaap_IncomeTaxReconciliationTaxCredits | (819,000)us-gaap_IncomeTaxReconciliationTaxCredits | (629,000)us-gaap_IncomeTaxReconciliationTaxCredits
State taxes, net of federal tax benefit | 2,939,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1,512,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1,182,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, net | (152,000)us-gaap_IncomeTaxReconciliationOtherAdjustments | (380,000)us-gaap_IncomeTaxReconciliationOtherAdjustments | (1,374,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense | $ 37,229,000 us-gaap_IncomeTaxExpenseBenefit | $ 28,196,000 us-gaap_IncomeTaxExpenseBenefit | $ 22,816,000 us-gaap_IncomeTaxExpenseBenefit

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- Definition The amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis of pension liabilities funded in advance and the basis of a prepaid pension asset determined in accordance with generally accepted accounting principles. The difference in basis of such costs will increase future taxable income when such basis difference reverses. Prepaid pension costs represented the cumulative employer's contributions in excess of net pension cost recognized, before the adoption of the recognition provisions of FAS 158. Under FAS 158, prepaid pension costs are no longer recognized in the statement of financial position. + References No definition available. + Details
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