XML 69 R58.htm IDEA: XBRL DOCUMENT v3.22.1

COMMITMENTS AND CONTINGENCIES - Contractual Amounts of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Commitments to make loans | Fixed Rate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	$ 26,606	$ 20,772
Commitments to make loans | Variable Rate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	52,207	46,558
Unused lines of credit | Fixed Rate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	3,490	4,745
Unused lines of credit | Variable Rate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	288,692	288,368
Standby letters of credit | Fixed Rate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	0	0
Standby letters of credit | Variable Rate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual amounts of financial instruments with off-balance sheet risk	$ 16,856	$ 7,974

X

- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

+ Details

Name:	us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=chmg_FixedInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=chmg_VariableInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_UnusedLinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: