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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 |  |  | $ 49,600 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue |
Total (losses)/gains included in earnings |  |  | (15,450)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 | [1],[2]
Total gains included in other comprehensive income |  |  | 12,379 us-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 |  |  | 293 cbu_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLoanOriginationCommitmentsRealEstate |
Ending balance |  |  | 44 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue |
Pooled Trust Preferred Securities [Member] |  |  |  |
Level 3 Assets Measured at Fair Value on a Recurring Basis [Abstract] |  |  |  |
Beginning balance |  |  | 49,600 us-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 |  |  | 12,379 us-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 |  |  | 0 cbu_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLoanOriginationCommitmentsRealEstate / us-gaap_FairValueByAssetClassAxis = cbu_PooledTrustPreferredSecuritiesMember |
Ending balance |  |  | 0 us-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 | 44 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = cbu_RealEstateLoanOriginationAndSaleCommitmentsMember |  | 0 us-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 | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = cbu_RealEstateLoanOriginationAndSaleCommitmentsMember | [3] | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = cbu_RealEstateLoanOriginationAndSaleCommitmentsMember | [3]
Principal reductions | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements / us-gaap_FairValueByAssetClassAxis = cbu_RealEstateLoanOriginationAndSaleCommitmentsMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements / us-gaap_FairValueByAssetClassAxis = cbu_RealEstateLoanOriginationAndSaleCommitmentsMember |
Sales | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = cbu_RealEstateLoanOriginationAndSaleCommitmentsMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = cbu_RealEstateLoanOriginationAndSaleCommitmentsMember |
Commitments to originate real estate loans held for sale, net | 564 cbu_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLoanOriginationCommitmentsRealEstate / us-gaap_FairValueByAssetClassAxis = cbu_RealEstateLoanOriginationAndSaleCommitmentsMember |  | 293 cbu_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLoanOriginationCommitmentsRealEstate / us-gaap_FairValueByAssetClassAxis = cbu_RealEstateLoanOriginationAndSaleCommitmentsMember |
Ending balance | $ 185 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = cbu_RealEstateLoanOriginationAndSaleCommitmentsMember |  | $ 44 us-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.

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 c -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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