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FAIR VALUE, Unobservable Input Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Level 3 Assets Measured at Fair Value on a Recurring Basis [Abstract]    
Beginning balance   $ 49,600us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Total (losses)/gains included in earnings   (15,450)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 [1],[2]
Total gains included in other comprehensive income   12,379us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss [3]
Principal reductions   (5,944)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
Sales   (40,834)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
Commitments to originate real estate loans held for sale, net   293cbu_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLoanOriginationCommitmentsRealEstate
Ending balance   44us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Pooled Trust Preferred Securities [Member]    
Level 3 Assets Measured at Fair Value on a Recurring Basis [Abstract]    
Beginning balance   49,600us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= cbu_PooledTrustPreferredSecuritiesMember
Total (losses)/gains included in earnings   (15,201)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= cbu_PooledTrustPreferredSecuritiesMember		 [1],[2]
Total gains included in other comprehensive income   12,379us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= cbu_PooledTrustPreferredSecuritiesMember		 [3]
Principal reductions   (5,944)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByAssetClassAxis
= cbu_PooledTrustPreferredSecuritiesMember
Sales   (40,834)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= cbu_PooledTrustPreferredSecuritiesMember
Commitments to originate real estate loans held for sale, net   0cbu_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLoanOriginationCommitmentsRealEstate
/ us-gaap_FairValueByAssetClassAxis
= cbu_PooledTrustPreferredSecuritiesMember
Ending balance   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= cbu_PooledTrustPreferredSecuritiesMember
Commitments to Originate Real Estate Loans for Sale [Member]    
Level 3 Assets Measured at Fair Value on a Recurring Basis [Abstract]    
Beginning balance 44us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember
Total (losses)/gains included in earnings (423)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember		 [1],[2] (249)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember		 [1],[2]
Total gains included in other comprehensive income 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember		 [3] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember		 [3]
Principal reductions 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember
Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember
Commitments to originate real estate loans held for sale, net 564cbu_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLoanOriginationCommitmentsRealEstate
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember		 293cbu_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLoanOriginationCommitmentsRealEstate
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember
Ending balance $ 185us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember		 $ 44us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= cbu_RealEstateLoanOriginationAndSaleCommitmentsMember
[1] Amounts included in earnings associated with the pooled trust preferred securities relate to accretion of related discount, and are reported in interest and dividends on taxable investments.
[2] Amounts included in earnings associated with the commitments to originate real estate loans for sale are reported as a component of other banking services in the Consolidated Statement of Income.
[3] Amounts included in other comprehensive income associated with the pooled trust preferred securities relate to changes in unrealized loss and are reported as a component of net unrealized gains/(losses) on available-for-sale securities in the Statement of Comprehensive Income.