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FAIR VALUE, Valuation Techniques (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Other Real Estate Owned [Member] | Fair Value of Collateral [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value of assets classified as Level 3 | 1,855 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = cbu_OtherRealEstateOwnedMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 5,060 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = cbu_OtherRealEstateOwnedMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Other Real Estate Owned [Member] | Fair Value of Collateral [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Estimated cost of disposal/market adjustment (in hundredths) | 10.00%cbu_FairValueInputsEstimatedCostOfDisposalOrMarketAdjustment / us-gaap_FairValueByAssetClassAxis = cbu_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 11.00%cbu_FairValueInputsEstimatedCostOfDisposalOrMarketAdjustment / us-gaap_FairValueByAssetClassAxis = cbu_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Other Real Estate Owned [Member] | Fair Value of Collateral [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Estimated cost of disposal/market adjustment (in hundredths) | 77.50%cbu_FairValueInputsEstimatedCostOfDisposalOrMarketAdjustment / us-gaap_FairValueByAssetClassAxis = cbu_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 54.40%cbu_FairValueInputsEstimatedCostOfDisposalOrMarketAdjustment / us-gaap_FairValueByAssetClassAxis = cbu_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Other Real Estate Owned [Member] | Fair Value of Collateral [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Estimated cost of disposal/market adjustment (in hundredths) | 30.60%cbu_FairValueInputsEstimatedCostOfDisposalOrMarketAdjustment / us-gaap_FairValueByAssetClassAxis = cbu_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | 28.10%cbu_FairValueInputsEstimatedCostOfDisposalOrMarketAdjustment / us-gaap_FairValueByAssetClassAxis = cbu_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember
Commitments To Originate Real Estate Loans For Sale [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value of assets classified as Level 3 | 185 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = cbu_CommitmentsToOriginateRealEstateLoansForSaleMember / us-gaap_ValuationTechniqueAxis = cbu_DiscountedCashFlowMember | 44 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = cbu_CommitmentsToOriginateRealEstateLoansForSaleMember / us-gaap_ValuationTechniqueAxis = cbu_DiscountedCashFlowMember
Embedded servicing value (in hundredths) | 1.00%cbu_FairValueInputsEmbeddedServicingValue / us-gaap_FairValueByAssetClassAxis = cbu_CommitmentsToOriginateRealEstateLoansForSaleMember / us-gaap_ValuationTechniqueAxis = cbu_DiscountedCashFlowMember | 1.00%cbu_FairValueInputsEmbeddedServicingValue / us-gaap_FairValueByAssetClassAxis = cbu_CommitmentsToOriginateRealEstateLoansForSaleMember / us-gaap_ValuationTechniqueAxis = cbu_DiscountedCashFlowMember

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- Definition Embedded servicing value, used as an input to measure fair value. + References No definition available. + Details
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- Definition Adjustment to the appraisal used to measure fair value for estimated cost of disposal or market adjustment. + References No definition available. + Details
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Namespace Prefix: | cbu_
Data Type: | num:percentItemType
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |