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COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Details) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Contract amount of commitments and contingencies |  | $ 757,743,000 cbu_FaceValueDisclosureOffBalanceSheetRisksFaceAmountLiability | $ 729,353,000 cbu_FaceValueDisclosureOffBalanceSheetRisksFaceAmountLiability
Unused lines of credit |  | 25,000,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity |
Federal Home Loan Bank unused borrowing capacity |  | 800,000,000 us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds |
Federal Reserve Bank unused borrowing capacity |  | 9,800,000 cbu_FederalReserveBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds |
Federal Reserve required average total reserve |  | 64,100,000 cbu_FederalReserveRequiredAverageTotalReserve |
Federal Reserve Bank of New York reserve requirement represented by cash on hand |  | 60,000,000 cbu_FederalReserveRequiredCashDeposit |
Required deposit with Federal Reserve Bank of New York |  | 4,100,000 cbu_FederalReserveRequiredReserveDeposit |
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, lower range |  | 0 us-gaap_LossContingencyRangeOfPossibleLossMinimum |
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, upper range |  | 1,000,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum |
Litigation settlement charge | 2,800,000 us-gaap_LitigationSettlementAmount |  |
Commitments to Extend Credit [Member] |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Contract amount of commitments and contingencies |  | 733,827,000 cbu_FaceValueDisclosureOffBalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember | 704,904,000 cbu_FaceValueDisclosureOffBalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Standby Letters of Credit [Member] |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Contract amount of commitments and contingencies |  | $ 23,916,000 cbu_FaceValueDisclosureOffBalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember | $ 24,449,000 cbu_FaceValueDisclosureOffBalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember

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- Definition States the total dollar amount of advances or credit lines available as of the Balance Sheet date from the Federal Reserve Bank system. + References No definition available. + Details
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- Definition Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22 (b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 3(a) -Article 9 + Details
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