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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 Proceeding Party | Dec. 31, 2014
Settled Litigation [Member] |  |
Loss Contingencies [Line Items] |  |
Number of legal proceedings settled | 2 us-gaap_LossContingencyClaimsSettledAndDismissedNumber / us-gaap_LitigationStatusAxis = us-gaap_SettledLitigationMember |
Number of parties | 2 chmg_NumberOfParty / us-gaap_LitigationStatusAxis = us-gaap_SettledLitigationMember |
Amount of litigation settlement | $ 12,100,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationStatusAxis = us-gaap_SettledLitigationMember |
Accrual for legal settlement | 12,100,000 us-gaap_SettlementLiabilitiesCurrent / us-gaap_LitigationStatusAxis = us-gaap_SettledLitigationMember | 12,100,000 us-gaap_SettlementLiabilitiesCurrent / us-gaap_LitigationStatusAxis = us-gaap_SettledLitigationMember
Receivable for insurance proceeds | 7,900,000 us-gaap_InsuranceSettlementsReceivableCurrent / us-gaap_LitigationStatusAxis = us-gaap_SettledLitigationMember | 7,900,000 us-gaap_InsuranceSettlementsReceivableCurrent / us-gaap_LitigationStatusAxis = us-gaap_SettledLitigationMember
Commitments to Make Loans [Member] | Fixed Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet contractual amounts of financial instruments | 27,618,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_FixedInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember | 23,756,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_FixedInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Commitments to Make Loans [Member] | Variable Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet contractual amounts of financial instruments | 10,415,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_VariableInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember | 11,082,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_VariableInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Unused Line of Credit [Member] | Fixed Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet contractual amounts of financial instruments | 1,120,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_FixedInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember | 812,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_FixedInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember
Unused Line of Credit [Member] | Variable Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet contractual amounts of financial instruments | 177,007,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_VariableInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember | 185,235,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_VariableInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember
Standby Letters of Credit [Member] | Fixed Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet contractual amounts of financial instruments | 0 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_FixedInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember | 0 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_FixedInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember
Standby Letters of Credit [Member] | Variable Rate [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet contractual amounts of financial instruments | $ 17,053,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_VariableInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember | $ 16,747,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_DebtInstrumentAxis = chmg_VariableInterestRateMember / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember

X
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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + 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=35750535&loc=d3e13433-108611 + Details
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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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Balance Type: | debit
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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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- Definition The number of claims settled and dismissed during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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