XML 48 R42.htm IDEA: XBRL DOCUMENT
v3.24.3

Loans and Allowance for Credit Losses - Summary of Amortized Cost Basis Loans Modified To Borrowers Experiencing On Financing Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized Cost Basis | $ 121 | $ 189
Term Extension | 162 | 189
Current [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension | 41 | 60
30-89 days [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension | 0 | 0
Greater than 90 days [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension | 121 | 129
Commercial and Industrial [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized Cost Basis |  | $ 60
% of Total Class of Financing Receivable |  | 0.00%
Term Extension | 41 | $ 60
Commercial and Industrial [Member] | Troubled Loan Modification [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension |  | 60
Commercial and Industrial [Member] | Current [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension | 41 | 60
Commercial and Industrial [Member] | 30-89 days [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension | 0 | 0
Commercial and Industrial [Member] | Greater than 90 days [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension | 0 | 0
Residential Real Estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized Cost Basis | $ 121 | $ 129
% of Total Class of Financing Receivable | 0.00% | 0.00%
Term Extension | $ 121 | $ 129
Residential Real Estate [Member] | Troubled Loan Modification [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension | 121 | 129
Residential Real Estate [Member] | Current [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension | 0 | 0
Residential Real Estate [Member] | 30-89 days [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension | 0 | 0
Residential Real Estate [Member] | Greater than 90 days [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension | 121 | 129
Commercial And Industrial And Residential Real Estate Portfolio Segment [Member] | Troubled Loan Modification [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Term Extension | $ 121 | $ 189

X
- Definition Financing receivable troubled loan modification amortized cost. + References No definition available. + Details
Name: | cofs_FinancingReceivableTroubledLoanModificationAmortizedCost
Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of total class of financing receivable. + References No definition available. + Details
Name: | cofs_PercentageOfTotalClassOfFinancingReceivable
Namespace Prefix: | cofs_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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 Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-34 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-33 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=us-gaap_MaturityUpTo30DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=us-gaap_Maturity30To90DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=us-gaap_MaturityOver90DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_LoanRestructuringModificationNameAxis=cofs_TroubledLoanModificationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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