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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Segment | Dec. 31, 2013 | Dec. 31, 2012
SEGMENT REPORTING [Abstract] |  |  |
Number of primary business segment | 2 us-gaap_NumberOfOperatingSegments |  |
Reportable segments and reconciliation to consolidated results [Abstract] |  |  |
Net interest income | $ 49,568 us-gaap_InterestIncomeExpenseNet | $ 46,631 us-gaap_InterestIncomeExpenseNet | $ 46,842 us-gaap_InterestIncomeExpenseNet
Provision for loan losses | 3,981 us-gaap_ProvisionForLoanAndLeaseLosses | 2,755 us-gaap_ProvisionForLoanAndLeaseLosses | 828 us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses | 45,587 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 43,876 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 46,014 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Other operating income | 26,756 us-gaap_NoninterestIncome | 18,077 us-gaap_NoninterestIncome | 17,188 us-gaap_NoninterestIncome
Legal settlements | 4,250 us-gaap_LegalFees | 0 us-gaap_LegalFees | 0 us-gaap_LegalFees
Other operating expenses | 56,227 us-gaap_OtherExpenses | 49,400 us-gaap_OtherExpenses | 46,795 us-gaap_OtherExpenses
Income (loss) before income tax expense | 11,866 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 12,553 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 16,407 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit | 3,709 us-gaap_IncomeTaxExpenseBenefit | 3,822 us-gaap_IncomeTaxExpenseBenefit | 5,385 us-gaap_IncomeTaxExpenseBenefit
Net income | 8,157 us-gaap_NetIncomeLoss | 8,731 us-gaap_NetIncomeLoss | 11,022 us-gaap_NetIncomeLoss
Segment assets | 1,524,539 us-gaap_Assets | 1,476,143 us-gaap_Assets | 1,248,160 us-gaap_Assets
Holding Company and Other [Member] |  |  |
Reportable segments and reconciliation to consolidated results [Abstract] |  |  |
Net interest income | 12 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 10 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 8 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Provision for loan losses | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Net interest income after provision for loan losses | 12 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 10 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 8 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Other operating income | 824 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 820 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 764 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Legal settlements | 0 us-gaap_LegalFees / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |
Other operating expenses | 875 us-gaap_OtherExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 784 us-gaap_OtherExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 856 us-gaap_OtherExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Income (loss) before income tax expense | (39)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 46 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (84)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Income tax benefit | (83)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (34)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (122)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Net income | 44 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 80 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 38 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Segment assets | 1,598 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 1,718 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 2,252 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Operating Segments [Member] | Core Banking [Member] |  |  |
Reportable segments and reconciliation to consolidated results [Abstract] |  |  |
Net interest income | 49,556 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 46,621 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 46,834 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember
Provision for loan losses | 3,981 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 2,755 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 828 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember
Net interest income after provision for loan losses | 45,575 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 43,866 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 46,006 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember
Other operating income | 18,186 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 9,913 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 9,597 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember
Legal settlements | 0 us-gaap_LegalFees / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember |  |
Other operating expenses | 49,997 us-gaap_OtherExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 43,136 us-gaap_OtherExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 40,550 us-gaap_OtherExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember
Income (loss) before income tax expense | 13,764 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 10,643 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 15,053 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember
Income tax benefit | 4,507 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 3,139 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 4,954 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember
Net income | 9,257 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 7,504 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 10,099 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember
Segment assets | 1,518,584 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 1,469,482 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 1,240,752 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember
Operating Segments [Member] | Wealth Management Group Services [Member] |  |  |
Reportable segments and reconciliation to consolidated results [Abstract] |  |  |
Net interest income | 0 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 0 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 0 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember
Provision for loan losses | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember
Net interest income after provision for loan losses | 0 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 0 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 0 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember
Other operating income | 7,746 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 7,344 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 6,827 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember
Legal settlements | 4,250 us-gaap_LegalFees / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember |  |
Other operating expenses | 5,355 us-gaap_OtherExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 5,480 us-gaap_OtherExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 5,389 us-gaap_OtherExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember
Income (loss) before income tax expense | (1,859)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 1,864 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 1,438 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember
Income tax benefit | (715)us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 717 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 553 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember
Net income | (1,144)us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 1,147 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 885 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember
Segment assets | $ 4,357 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | $ 4,943 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | $ 5,156 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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