CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest and Dividend Income:
Loans, including fees	$ 47,139	$ 45,136	$ 45,298
Taxable securities	5,043us-gaap_InterestIncomeSecuritiesTaxable	4,391us-gaap_InterestIncomeSecuritiesTaxable	5,357us-gaap_InterestIncomeSecuritiesTaxable
Tax exempt securities	967	1,100	1,268
Interest-bearing deposits	64	36	153
Total interest and dividend income	53,213	50,663	52,076
Interest Expense:
Deposits	2,043us-gaap_InterestExpenseDeposits	2,350us-gaap_InterestExpenseDeposits	3,181us-gaap_InterestExpenseDeposits
Borrowed funds	754us-gaap_InterestExpenseBorrowings	824us-gaap_InterestExpenseBorrowings	1,059us-gaap_InterestExpenseBorrowings
Securities sold under agreements to repurchase	848	858	994
Total interest expense	3,645us-gaap_InterestExpense	4,032us-gaap_InterestExpense	5,234us-gaap_InterestExpense
Net interest income	49,568us-gaap_InterestIncomeExpenseNet	46,631us-gaap_InterestIncomeExpenseNet	46,842us-gaap_InterestIncomeExpenseNet
Provision for loan losses	3,981us-gaap_ProvisionForLoanAndLeaseLosses	2,755us-gaap_ProvisionForLoanAndLeaseLosses	828us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses	45,587	43,876	46,014
Other operating income:
Wealth management group fee income	7,747	7,344	6,827
Service charges on deposit accounts	5,281	4,706	4,241
Net gains on securities transactions	6,869us-gaap_GainLossOnSaleOfSecuritiesNet	16us-gaap_GainLossOnSaleOfSecuritiesNet	301us-gaap_GainLossOnSaleOfSecuritiesNet
Net impairment loss on investment securities	0	(29)	0
Net gain on sales of loans held for sale	301us-gaap_GainLossOnSalesOfLoansNet	503us-gaap_GainLossOnSalesOfLoansNet	484us-gaap_GainLossOnSalesOfLoansNet
Casualty gains	0chmg_CasualtyGain	0chmg_CasualtyGain	790chmg_CasualtyGain
Net gains (losses) on sales of other real estate owned	(64)	28	(45)
Gain from bargain purchase	0	470	0
Income from bank owned life insurance	78us-gaap_BankOwnedLifeInsuranceIncome	84us-gaap_BankOwnedLifeInsuranceIncome	87us-gaap_BankOwnedLifeInsuranceIncome
Other	6,544	4,955	4,503
Total other operating income	26,756us-gaap_NoninterestIncome	18,077us-gaap_NoninterestIncome	17,188us-gaap_NoninterestIncome
Other operating expenses:
Salaries and wages	21,315chmg_SalariesAndIncentiveCompensation	19,365chmg_SalariesAndIncentiveCompensation	18,918chmg_SalariesAndIncentiveCompensation
Pension and other employee benefits	5,733	5,939	5,624
Net occupancy expenses	7,098us-gaap_OccupancyNet	5,501us-gaap_OccupancyNet	5,164us-gaap_OccupancyNet
Furniture and equipment expenses	2,972us-gaap_EquipmentExpense	2,326us-gaap_EquipmentExpense	2,205us-gaap_EquipmentExpense
Data processing expense	6,393	4,750	4,421
Professional services	1,597us-gaap_ProfessionalFees	928us-gaap_ProfessionalFees	1,443us-gaap_ProfessionalFees
Legal settlements	4,250us-gaap_LegalFees	0us-gaap_LegalFees	0us-gaap_LegalFees
Amortization of intangible assets	1,310us-gaap_AmortizationOfIntangibleAssets	921us-gaap_AmortizationOfIntangibleAssets	1,047us-gaap_AmortizationOfIntangibleAssets
Marketing and advertising expense	1,079us-gaap_MarketingAndAdvertisingExpense	1,033us-gaap_MarketingAndAdvertisingExpense	1,068us-gaap_MarketingAndAdvertisingExpense
Other real estate owned expenses	247us-gaap_ForeclosedRealEstateExpense	194us-gaap_ForeclosedRealEstateExpense	328us-gaap_ForeclosedRealEstateExpense
FDIC insurance	1,116	866	807
Loan expense	811us-gaap_LoanPortfolioExpense	779us-gaap_LoanPortfolioExpense	788us-gaap_LoanPortfolioExpense
Merger and acquisition related expenses	115	1,387	30
Other	6,441us-gaap_OtherNoninterestExpense	5,411us-gaap_OtherNoninterestExpense	4,952us-gaap_OtherNoninterestExpense
Total other operating expenses	60,477us-gaap_NoninterestExpense	49,400us-gaap_NoninterestExpense	46,795us-gaap_NoninterestExpense
Income (loss) before income tax expense	11,866	12,553	16,407
Income tax expense	3,709us-gaap_IncomeTaxExpenseBenefit	3,822us-gaap_IncomeTaxExpenseBenefit	5,385us-gaap_IncomeTaxExpenseBenefit
Net income	$ 8,157us-gaap_NetIncomeLoss	$ 8,731us-gaap_NetIncomeLoss	$ 11,022us-gaap_NetIncomeLoss
Weighted average shares outstanding (in shares)	4,683	4,660	4,641
Basic and diluted earnings per share (in dollars per share)	$ 1.74us-gaap_EarningsPerShareBasicAndDiluted	$ 1.87us-gaap_EarningsPerShareBasicAndDiluted	$ 2.38us-gaap_EarningsPerShareBasicAndDiluted

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This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

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Amount of expense recognized during the period for the foreclosure on real estate assets.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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Aggregate amount of interest expense on all borrowings.

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The loan servicing fees paid to third parties that relate to loan expenses for a portfolio containing the entire group of loans owned by the company.

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