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v2.4.1.9

INCOME TAXES (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Current [Abstract] |  |  |
Federal | $ 30,006,000 us-gaap_CurrentFederalTaxExpenseBenefit | $ 24,202,000 us-gaap_CurrentFederalTaxExpenseBenefit | $ 18,875,000 us-gaap_CurrentFederalTaxExpenseBenefit
State and other | 870,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 866,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 830,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred [Abstract] |  |  |
Federal | 6,867,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 5,806,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 9,051,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and other | 594,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1,324,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 2,981,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Provision for income taxes | 38,337,000 us-gaap_IncomeTaxExpenseBenefit | 32,198,000 us-gaap_IncomeTaxExpenseBenefit | 31,737,000 us-gaap_IncomeTaxExpenseBenefit
Components of net deferred tax liability [Abstract] |  |  |
Allowance for loan losses | 17,476,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses | 17,246,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses |
Employee benefits | 6,834,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits | 6,329,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits |
Investment securities | 0 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross | 4,882,000 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross |
Debt extinguishment | 904,000 cbu_DeferredTaxAssetsDebtExtinguishment | 1,215,000 cbu_DeferredTaxAssetsDebtExtinguishment |
Other, net | 10,725,000 us-gaap_DeferredTaxAssetsOther | 11,701,000 us-gaap_DeferredTaxAssetsOther |
Deferred tax asset | 35,939,000 us-gaap_DeferredTaxAssetsGross | 41,373,000 us-gaap_DeferredTaxAssetsGross |
Investment securities | 37,527,000 cbu_DeferredTaxLiabilitiesUnrealizedGainsOnInvestmentSecurities | 0 cbu_DeferredTaxLiabilitiesUnrealizedGainsOnInvestmentSecurities |
Tax-deductible goodwill | 35,842,000 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill | 31,997,000 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill |
Loan origination costs | 6,792,000 cbu_DeferredTaxLiabilitiesDeferredExpenseDeferredLoanOriginationCosts | 6,883,000 cbu_DeferredTaxLiabilitiesDeferredExpenseDeferredLoanOriginationCosts |
Depreciation | 3,722,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 4,838,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Mortgage servicing rights | 419,000 us-gaap_DeferredTaxLiabilitiesMortgageServicingRights | 473,000 us-gaap_DeferredTaxLiabilitiesMortgageServicingRights |
Pension | 16,845,000 us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | 21,735,000 us-gaap_DeferredTaxLiabilitiesPrepaidExpenses |
Deferred tax liability | 101,147,000 us-gaap_DeferredTaxLiabilities | 65,926,000 us-gaap_DeferredTaxLiabilities |
Net deferred tax liability | (65,208,000)us-gaap_DeferredTaxAssetsLiabilitiesNet | (24,553,000)us-gaap_DeferredTaxAssetsLiabilitiesNet |
Effective tax rate reconciliation [Abstract] |  |  |
Federal statutory income tax rate (in hundredths) | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increase (reduction) in taxes resulting from [Abstract] |  |  |
Tax-exempt interest (in hundredths) | (5.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome | (6.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome | (7.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
State income taxes, net of federal benefit (in hundredths) | 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 2.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other (in hundredths) | (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate (in hundredths) | 29.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 29.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 29.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Unrecognized tax benefits [Roll forward] |  |  |
Unrecognized tax benefits at beginning of year | 138,000 us-gaap_UnrecognizedTaxBenefits | 70,000 us-gaap_UnrecognizedTaxBenefits | 133,000 us-gaap_UnrecognizedTaxBenefits
Changes related to [Abstract] |  |  |
Positions taken during the current year | 24,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 68,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 35,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Settlements with taxing authorities | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (98,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Unrecognized tax benefits at end of year | 162,000 us-gaap_UnrecognizedTaxBenefits | 138,000 us-gaap_UnrecognizedTaxBenefits | 70,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate, if recognized | $ 200,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |

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