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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total
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Balances at Dec. 31, 2011 | $ 53 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 45,582 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 100,629 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (18,894)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (1,441)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 125,929 us-gaap_StockholdersEquity
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 11,022 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 11,022 us-gaap_NetIncomeLoss
Other comprehensive income (loss) | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (1,366)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (1,366)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Restricted stock awards | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 80 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 80 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
Distribution of shares of treasury stock granted for directors' deferred compensation plan | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (82)chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 83 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue
Distribution of shares of treasury stock granted for employee restricted stock awards, net | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (274)chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 274 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants
Restricted stock units for directors' deferred compensation plan | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 87 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 87 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan
Cash dividends declared | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (4,573)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (4,573)us-gaap_DividendsCommonStockCash
Distribution of shares of treasury stock for directors' compensation | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (28)chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 261 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 233 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue
Distribution of shares of treasury stock for employee compensation | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (8)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 88 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 80 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Sale of shares of treasury stock | 0 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 258 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 258 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
Purchase of shares of treasury stock | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (636)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (636)us-gaap_TreasuryStockValueAcquiredCostMethod
Balances at Dec. 31, 2012 | 53 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 45,357 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 107,078 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (18,566)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (2,807)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 131,115 us-gaap_StockholdersEquity
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 8,731 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 8,731 us-gaap_NetIncomeLoss
Other comprehensive income (loss) | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 2,962 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 2,962 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Restricted stock awards | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 131 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 131 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
Distribution of shares of treasury stock granted for directors' deferred compensation plan | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (75)chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 86 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 11 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue
Distribution of shares of treasury stock granted for employee restricted stock awards, net | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (206)chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 206 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants
Restricted stock units for directors' deferred compensation plan | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 99 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 99 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan
Cash dividends declared | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (4,778)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (4,778)us-gaap_DividendsCommonStockCash
Distribution of shares of treasury stock for directors' compensation | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 14 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 203 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 217 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue
Distribution of shares of treasury stock for employee compensation | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 7 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 105 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 112 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Forfeit of restricted stock awards | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 61 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (61)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
Sale of shares of treasury stock | 0 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 11 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 60 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 71 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued
Purchase of shares of treasury stock | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (93)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (93)us-gaap_TreasuryStockValueAcquiredCostMethod
Balances at Dec. 31, 2013 | 53 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 45,399 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 111,031 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (18,060)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 155 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 138,578 us-gaap_StockholdersEquity
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 8,157 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 8,157 us-gaap_NetIncomeLoss
Other comprehensive income (loss) | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (8,940)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (8,940)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Restricted stock awards | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 151 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 151 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
Distribution of shares of treasury stock granted for directors' deferred compensation plan | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (85)chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 88 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 3 chmg_DistributionOfSharesOfTreasuryStockForDirectorsDeferredCompensationValue
Distribution of shares of treasury stock granted for employee restricted stock awards, net | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (288)chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 288 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 chmg_DistributionShareOfTreasuryStockForEmployeeRestrictedStockWarrants
Restricted stock units for directors' deferred compensation plan | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 94 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 94 chmg_RestrictedStockUnitsForDirectorsDeferrredCompensationPlan
Cash dividends declared | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (4,805)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (4,805)us-gaap_DividendsCommonStockCash
Distribution of shares of treasury stock for directors' compensation | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 59 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 214 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 273 chmg_DistributionOfSharesOfTreasuryStockForDirectorsCompensationValue
Distribution of shares of treasury stock for employee compensation | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 25 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 92 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 117 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
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