XML 53 R41.htm IDEA: XBRL DOCUMENT
v3.21.1

LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Non-accrual | $ 9,325 | $ 9,952
Loans Past Due 90 Days or More and Still Accruing | 3 | 2
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 4,900 | 10,480
Loans Not Past Due | 1,581,084 | 1,531,018
Total ending loans balance | 1,585,984 | 1,541,498
30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 3,284 | 4,598
60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 374 | 4,357
90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,242 | 1,525
Commercial and agricultural: |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Total ending loans balance | 400,719 | 370,252
Commercial and agricultural: | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Non-accrual | 2,267 | 2,167
Loans Past Due 90 Days or More and Still Accruing | 3 | 2
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,081 | 564
Loans Not Past Due | 399,200 | 369,404
Total ending loans balance | 400,281 | 369,968
Commercial and agricultural: | Commercial and industrial | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,066 | 520
Commercial and agricultural: | Commercial and industrial | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 14
Commercial and agricultural: | Commercial and industrial | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 15 | 30
Commercial and agricultural: | Agricultural |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 0
Loans Not Past Due | 438 | 284
Total ending loans balance | 438 | 284
Commercial and agricultural: | Agricultural | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 0
Commercial and agricultural: | Agricultural | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 0
Commercial and agricultural: | Agricultural | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 0
Commercial mortgages: |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Total ending loans balance | 731,438 | 719,145
Commercial mortgages: | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Non-accrual | 51 | 55
Loans Past Due 90 Days or More and Still Accruing | 0 | 0
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 0
Loans Not Past Due | 58,525 | 62,164
Total ending loans balance | 58,525 | 62,164
Commercial mortgages: | Construction | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 0
Commercial mortgages: | Construction | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 0
Commercial mortgages: | Construction | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 0
Commercial mortgages: | Commercial mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Non-accrual | 4,541 | 4,415
Loans Past Due 90 Days or More and Still Accruing | 0 | 0
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,556 | 5,442
Loans Not Past Due | 671,357 | 651,539
Total ending loans balance | 672,913 | 656,981
Commercial mortgages: | Commercial mortgages | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,062 | 1,438
Commercial mortgages: | Commercial mortgages | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 174 | 3,696
Commercial mortgages: | Commercial mortgages | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 320 | 308
Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Non-accrual | 1,254 | 1,632
Loans Past Due 90 Days or More and Still Accruing | 0 | 0
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 899 | 1,684
Loans Not Past Due | 244,944 | 238,329
Total ending loans balance | 245,843 | 240,013
Residential mortgages | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 449 | 817
Residential mortgages | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 68 | 406
Residential mortgages | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 382 | 461
Consumer loans: |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Total ending loans balance | 207,984 | 212,088
Consumer loans: | Home equity lines and loans |  |
Financing Receivable, Past Due [Line Items] |  |
Non-accrual | 673 | 1,159
Loans Past Due 90 Days or More and Still Accruing | 0 | 0
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 281 | 1,036
Loans Not Past Due | 74,800 | 77,725
Total ending loans balance | 75,081 | 78,761
Consumer loans: | Home equity lines and loans | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 3 | 521
Consumer loans: | Home equity lines and loans | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 41
Consumer loans: | Home equity lines and loans | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 278 | 474
Consumer loans: | Indirect consumer loans |  |
Financing Receivable, Past Due [Line Items] |  |
Non-accrual | 521 | 519
Loans Past Due 90 Days or More and Still Accruing | 0 | 0
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 1,072 | 1,718
Loans Not Past Due | 120,125 | 119,135
Total ending loans balance | 121,197 | 120,853
Consumer loans: | Indirect consumer loans | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 700 | 1,268
Consumer loans: | Indirect consumer loans | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 132 | 198
Consumer loans: | Indirect consumer loans | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 240 | 252
Consumer loans: | Direct consumer loans |  |
Financing Receivable, Past Due [Line Items] |  |
Non-accrual | 18 | 5
Loans Past Due 90 Days or More and Still Accruing | 0 | 0
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 11 | 36
Loans Not Past Due | 11,695 | 12,438
Total ending loans balance | 11,706 | 12,474
Consumer loans: | Direct consumer loans | 30 - 59 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 4 | 34
Consumer loans: | Direct consumer loans | 60 - 89 Days Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | 0 | 2
Consumer loans: | Direct consumer loans | 90 Days or More Past Due |  |
Aging of the recorded investment in loans past due [Abstract] |  |
Past Due | $ 7 | $ 0

X
- Definition Financing Receivable, after Interest Receivable on Loans, before Allowance on Credit Loss + References No definition available. + Details
Name: | chmg_FinancingReceivableAfterInterestReceivableOnLoansBeforeAllowanceOnCreditLoss
Namespace Prefix: | chmg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of financing receivable not past due. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable past due. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=chmg_CommercialAndAgriculturalPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=chmg_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=chmg_AgriculturalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=chmg_CommercialMortgagesOtherLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=chmg_IndirectConsumerLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=chmg_DirectConsumerLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |