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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 Segment | Mar. 31, 2014 | Dec. 31, 2014
SEGMENT REPORTING [Abstract] |  |  |
Number of primary business segment | 2 us-gaap_NumberOfOperatingSegments |  |
Reportable segments and reconciliation to consolidated results [Abstract] |  |  |
Net interest income | $ 12,342 us-gaap_InterestIncomeExpenseNet | $ 12,033 us-gaap_InterestIncomeExpenseNet |
Provision for loan losses | 390 us-gaap_ProvisionForLoanAndLeaseLosses | 639 us-gaap_ProvisionForLoanAndLeaseLosses |
Net interest income after provision for loan losses | 11,952 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 11,394 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss |
Other non-interest income | 5,186 us-gaap_NoninterestIncome | 4,964 us-gaap_NoninterestIncome |
Other non-interest expenses | 13,736 us-gaap_NoninterestExpense | 13,343 us-gaap_NoninterestExpense |
Income before income tax expense | 3,402 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,015 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Income tax expense (benefit) | 1,126 us-gaap_IncomeTaxExpenseBenefit | 951 us-gaap_IncomeTaxExpenseBenefit |
Net income | 2,276 us-gaap_NetIncomeLoss | 2,064 us-gaap_NetIncomeLoss |
Segment assets | 1,584,772 us-gaap_Assets | 1,497,531 us-gaap_Assets | 1,524,539 us-gaap_Assets
Holding Company and Other [Member] |  |  |
Reportable segments and reconciliation to consolidated results [Abstract] |  |  |
Net interest income | 3 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 3 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 |
Net interest income after provision for loan losses | 3 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 3 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |
Other non-interest income | 346 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 193 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |
Other non-interest expenses | 284 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 213 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |
Income before income tax expense | 65 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (17)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |
Income tax expense (benefit) | 9 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (24)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |
Net income | 56 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 7 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |
Segment assets | 1,679 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 1,796 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 | 12,339 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 12,030 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember |
Provision for loan losses | 390 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 639 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember |
Net interest income after provision for loan losses | 11,949 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 11,391 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember |
Other non-interest income | 2,738 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 2,888 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember |
Other non-interest expenses | 12,148 us-gaap_NoninterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 11,812 us-gaap_NoninterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember |
Income before income tax expense | 2,539 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 2,467 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember |
Income tax expense (benefit) | 815 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 758 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember |
Net income | 1,724 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 1,709 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember |
Segment assets | 1,578,386 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_CoreBankingMember | 1,490,857 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 |
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 |
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 |
Other non-interest income | 2,102 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 1,883 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember |
Other non-interest expenses | 1,304 us-gaap_NoninterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 1,318 us-gaap_NoninterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember |
Income before income tax expense | 798 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 565 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember |
Income tax expense (benefit) | 302 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 217 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember |
Net income | 496 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | 348 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember |
Segment assets | $ 4,707 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember | $ 4,878 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = chmg_WealthManagementGroupServicesMember |

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