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LEASES - Leased Branch Properties (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Leases [Abstract] |  |
Operating lease right-of-use asset | $ 7,234 | $ 7,145
Less: accumulated amortization | (393) | (759)
Less: lease termination | 0 | (313)
Add: new lease agreement and modifications | 0 | 1,161
Operating lease right-of-use assets | $ 6,841 | $ 7,234

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- Definition Operating Lease, Right-Of-Use Asset, Accumulated Amortization + References No definition available. + Details
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Namespace Prefix: | chmg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Operating Lease, Right-Of-Use Asset, Gross + References No definition available. + Details
Name: | chmg_OperatingLeaseRightOfUseAssetGross
Namespace Prefix: | chmg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Operating Lease, Right-of-Use Asset, Lease Termination + References No definition available. + Details
Name: | chmg_OperatingLeaseRightOfUseAssetLeaseTermination
Namespace Prefix: | chmg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating Lease, Right-of-Use Asset, New Lease Agreement and Modifications + References No definition available. + Details
Name: | chmg_OperatingLeaseRightOfUseAssetNewLeaseAgreementAndModifications
Namespace Prefix: | chmg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant