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DERIVATIVE INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |
Gain/(Loss) recognized in statement of income | $ 72 us-gaap_DerivativeGainLossOnDerivativeNet
Not Designated as Hedging Instrument [Member] |
Derivatives, Fair Value [Line Items] |
Fair Value | 142 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Forward Sales Commitments [Member] | Mortgage Banking and Other Services [Member] |
Derivative Instruments, Gain (Loss) [Line Items] |
Gain/(Loss) recognized in statement of income | (69)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember
Commitments To Originate Real Estate Loans For Sale [Member] | Mortgage Banking and Other Services [Member] |
Derivative Instruments, Gain (Loss) [Line Items] |
Gain/(Loss) recognized in statement of income | 141 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = cbu_CommitmentsToOriginateRealEstateLoansForSaleMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember
Other Assets [Member] | Commitments To Originate Real Estate Loans For Sale [Member] | Not Designated as Hedging Instrument [Member] |
Derivatives, Fair Value [Line Items] |
Notional | 6,183 invest_DerivativeNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = cbu_CommitmentsToOriginateRealEstateLoansForSaleMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Fair Value | 185 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = cbu_CommitmentsToOriginateRealEstateLoansForSaleMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Other Liabilities [Member] | Forward Sales Commitments [Member] | Not Designated as Hedging Instrument [Member] |
Derivatives, Fair Value [Line Items] |
Notional | 3,077 invest_DerivativeNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Fair Value | $ (43)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Details
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- Details
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