CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Interest and dividend income:
Loans, including fees	$ 11,903	$ 11,168
Taxable securities	1,089us-gaap_InterestIncomeSecuritiesTaxable	1,503us-gaap_InterestIncomeSecuritiesTaxable
Tax exempt securities	219	264
Interest-bearing deposits	23	19
Total interest and dividend income	13,234	12,954
Interest expense:
Deposits	486us-gaap_InterestExpenseDeposits	522us-gaap_InterestExpenseDeposits
Securities sold under agreements to repurchase	209	209
Borrowed funds	197us-gaap_InterestExpenseBorrowings	190us-gaap_InterestExpenseBorrowings
Total interest expense	892us-gaap_InterestExpense	921us-gaap_InterestExpense
Net interest income	12,342us-gaap_InterestIncomeExpenseNet	12,033us-gaap_InterestIncomeExpenseNet
Provision for loan losses	390us-gaap_ProvisionForLoanAndLeaseLosses	639us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses	11,952	11,394
Other non-interest income:
WMG fee income	2,126	1,883
Service charges on deposit accounts	1,138	1,232
Net gain on security transactions	50us-gaap_GainLossOnSaleOfSecuritiesNet	0us-gaap_GainLossOnSaleOfSecuritiesNet
Net gain on sales of loans held for sale	52us-gaap_GainLossOnSalesOfLoansNet	41us-gaap_GainLossOnSalesOfLoansNet
Net gains (losses) on sales of other real estate owned	78	(30)
Income from bank owned life insurance	18us-gaap_BankOwnedLifeInsuranceIncome	19us-gaap_BankOwnedLifeInsuranceIncome
Other	1,724	1,819
Total other non-interest income	5,186us-gaap_NoninterestIncome	4,964us-gaap_NoninterestIncome
Other non-interest expense:
Salaries and wages	5,100chmg_SalariesAndIncentiveCompensation	5,153chmg_SalariesAndIncentiveCompensation
Pension and other employee benefits	1,729	1,359
Net occupancy expenses	1,850us-gaap_OccupancyNet	1,793us-gaap_OccupancyNet
Furniture and equipment expenses	733us-gaap_EquipmentExpense	630us-gaap_EquipmentExpense
Data processing expense	1,561	1,481
Professional services	269us-gaap_ProfessionalFees	222us-gaap_ProfessionalFees
Amortization of intangible assets	304us-gaap_AmortizationOfIntangibleAssets	344us-gaap_AmortizationOfIntangibleAssets
Marketing and advertising expenses	235us-gaap_MarketingAndAdvertisingExpense	293us-gaap_MarketingAndAdvertisingExpense
Other real estate owned expenses	84us-gaap_ForeclosedRealEstateExpense	87us-gaap_ForeclosedRealEstateExpense
FDIC insurance	286	269
Loan expense	140us-gaap_LoanPortfolioExpense	149us-gaap_LoanPortfolioExpense
Merger and acquisition related expenses	0	86
Other	1,445us-gaap_OtherNoninterestExpense	1,477us-gaap_OtherNoninterestExpense
Total other non-interest expenses	13,736us-gaap_NoninterestExpense	13,343us-gaap_NoninterestExpense
Income before income tax expense	3,402	3,015
Income tax expense	1,126us-gaap_IncomeTaxExpenseBenefit	951us-gaap_IncomeTaxExpenseBenefit
Net income	$ 2,276us-gaap_NetIncomeLoss	$ 2,064us-gaap_NetIncomeLoss
Weighted average shares outstanding (in shares)	4,707	4,677
Basic and diluted earnings per share (in dollars per share)	$ 0.48us-gaap_EarningsPerShareBasicAndDiluted	$ 0.44us-gaap_EarningsPerShareBasicAndDiluted

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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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 for Federal Deposit Insurance Corporation (FDIC) insurance.

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Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.

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Income from services rendered by trust departments or by any consolidated subsidiaries acting in a fiduciary capacity, including fees earned for (1) acting as an agent for fiduciary placement and loans and (2) custody or investment advisory services when such fees are not separately billed to the customer. This item excludes commissions and fees received for the accumulation or disbursement of funds deposited to Individual Retirement or Keogh plan accounts when such are not handled by the reporting entity's trust department.

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

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

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The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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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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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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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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Amount of the cost of borrowed funds accounted for as interest expense.

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Aggregate amount of interest expense on all borrowings.

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Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax.

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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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The total expense recognized in the period for promotion, public relations, and brand or product advertising.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (SX 210.5-03.6)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

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-Paragraph 1

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-Paragraph 1

-Subparagraph (SX 210.9-04.14(b))

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- Definition

Other noninterest expenses that are not separately presented in any other noninterest expense category.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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- Definition

A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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-Topic 946

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-Paragraph 1

-Subparagraph (SX 210.6-07.2(a),(b),(c),(d))

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Paragraph 28

-Subparagraph (a)

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-Name Regulation S-X (SX)

-Number 210

-Section 04

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-Name Accounting Standards Codification

-Topic 942

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-Paragraph 1

-Subparagraph (SX 210.9-04.11)

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-Subparagraph (c)(2)

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- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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No definition available.

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