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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 Stipulation Proceeding | Dec. 31, 2013 Proceeding
Pending Litigation [Member] |  |
Loss Contingencies [Line Items] |  |
Number of legal proceedings |  | 2 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember
Accrual for legal settlement | $ 12,100,000 us-gaap_SettlementLiabilitiesCurrent / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |
Receivable for insurance proceeds | 7,900,000 us-gaap_InsuranceSettlementsReceivableCurrent / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |
Number of stipulations submitted to Surrogate's Court | 2 chmg_NumberOfStipulationsSubmittedToSurrogateSCourt / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |
Pending Litigation [Member] | Objections to Final Settlement of Trust Account One [Member] |  |
Loss Contingencies [Line Items] |  |
Damages and disallowed trustee's commissions claimed | 13,200,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = chmg_ObjectionsToFinalSettlementOfTrustAccountOneMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |
Pending Litigation [Member] | Objections to Final Settlement of Trust Account Two [Member] |  |
Loss Contingencies [Line Items] |  |
Damages and disallowed trustee's commissions claimed | 24,100,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = chmg_ObjectionsToFinalSettlementOfTrustAccountTwoMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |
Minimum [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments period to make fixed-rate commercial draw notes | 3 months |
Minimum [Member] | Fixed Interest Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Interest rate on fixed-rate commitments to make loans (in hundredths) | 2.75%chmg_InterestRateOnFixedRateCommitmentsToMakeLoans / chmg_InterestRateTypeAxis = chmg_FixedInterestRateMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maturity period of fixed-rate commitments to make loans | 5 years |
Interest rate on fixed-rate commitments to make commercial draw notes (in hundredths) | 1.76%chmg_InterestRateOnFixedRateCommitmentsToMakeCommercialDrawNotes / chmg_InterestRateTypeAxis = chmg_FixedInterestRateMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments period to make real estate and home equity loans | 60 days |
Commitments period to make fixed-rate commercial draw notes | 18 months |
Off-balance sheet financial instruments, standard term | 12 months |
Maximum [Member] | Fixed Interest Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Interest rate on fixed-rate commitments to make loans (in hundredths) | 5.875%chmg_InterestRateOnFixedRateCommitmentsToMakeLoans / chmg_InterestRateTypeAxis = chmg_FixedInterestRateMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Maturity period of fixed-rate commitments to make loans | 30 years |
Interest rate on fixed-rate commitments to make commercial draw notes (in hundredths) | 5.25%chmg_InterestRateOnFixedRateCommitmentsToMakeCommercialDrawNotes / chmg_InterestRateTypeAxis = chmg_FixedInterestRateMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Commitments to Make Loans [Member] | Fixed Interest Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | 23,756,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / chmg_InterestRateTypeAxis = chmg_FixedInterestRateMember | 21,049,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / chmg_InterestRateTypeAxis = chmg_FixedInterestRateMember
Commitments to Make Loans [Member] | Variable Interest Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | 11,082,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / chmg_InterestRateTypeAxis = chmg_VariableInterestRateMember | 7,893,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / chmg_InterestRateTypeAxis = chmg_VariableInterestRateMember
Unused Line of Credit [Member] | Fixed Interest Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | 812,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember / chmg_InterestRateTypeAxis = chmg_FixedInterestRateMember | 2,190,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember / chmg_InterestRateTypeAxis = chmg_FixedInterestRateMember
Unused Line of Credit [Member] | Variable Interest Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | 185,235,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember / chmg_InterestRateTypeAxis = chmg_VariableInterestRateMember | 187,061,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember / chmg_InterestRateTypeAxis = chmg_VariableInterestRateMember
Standby Letters of Credit [Member] | Fixed Interest Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | 0 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember / chmg_InterestRateTypeAxis = chmg_FixedInterestRateMember | 0 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember / chmg_InterestRateTypeAxis = chmg_FixedInterestRateMember
Standby Letters of Credit [Member] | Variable Interest Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | $ 16,747,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember / chmg_InterestRateTypeAxis = chmg_VariableInterestRateMember | 17,290,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember / chmg_InterestRateTypeAxis = chmg_VariableInterestRateMember

X
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- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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