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SECURITIES, SECURITIES HELD TO MATURITY (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Amortized cost and estimated fair value of securities held to maturity [Abstract] |  |
Amortized Cost | $ 5,831 us-gaap_HeldToMaturitySecurities | $ 6,495 us-gaap_HeldToMaturitySecurities
Estimated Fair Value | 6,197 us-gaap_HeldToMaturitySecuritiesFairValue | 6,930 us-gaap_HeldToMaturitySecuritiesFairValue
Unrealized Gains | 366 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain | 435 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
Unrealized Losses | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Amortized Cost [Abstract] |  |
Within One Year | 2,629 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount |
After One, But Within Five Years | 2,199 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount |
After Five, But Within Ten Years | 1,003 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount |
After Ten Years | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount |
Amortized Cost | 5,831 us-gaap_HeldToMaturitySecurities | 6,495 us-gaap_HeldToMaturitySecurities
Fair Value [Abstract] |  |
Within One Year | 2,658 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue |
After One, But Within Five Years | 2,390 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |
After Five, But Within Ten Years | 1,149 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |
After Ten Years | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue |
Fair Value | 6,197 us-gaap_HeldToMaturitySecuritiesFairValue | 6,930 us-gaap_HeldToMaturitySecuritiesFairValue
Obligations of States and Political Subdivisions [Member] |  |
Amortized cost and estimated fair value of securities held to maturity [Abstract] |  |
Amortized Cost | 5,175 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 5,472 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Estimated Fair Value | 5,535 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 5,891 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized Gains | 360 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 419 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized Losses | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Amortized Cost [Abstract] |  |
Amortized Cost | 5,175 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 5,472 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Fair Value [Abstract] |  |
Fair Value | 5,535 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 5,891 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Time Deposits with Other Financial Institutions [Member] |  |
Amortized cost and estimated fair value of securities held to maturity [Abstract] |  |
Amortized Cost | 656 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember | 1,023 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember
Estimated Fair Value | 662 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember | 1,039 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember
Unrealized Gains | 6 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember | 16 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember
Unrealized Losses | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember
Amortized Cost [Abstract] |  |
Amortized Cost | 656 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember | 1,023 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember
Fair Value [Abstract] |  |
Fair Value | $ 662 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember | $ 1,039 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = chmg_TimeDepositsWithOtherFinancialInstitutionsMember

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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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