XML 49 R43.htm IDEA: XBRL DOCUMENT
v3.25.2

Loans and Allowance for Credit Losses - Schedule of outstanding balance and related allowance on loans (Details) - USD ($) $ in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Mar. 01, 2025 | Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan Balance | $ 98,681 | $ 112,911 | $ 98,681
ACL Balance | 4,530 | 4,924 | 4,924
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan Balance | 461 | 611 | 461
ACL Balance | 2 | 2 | 2
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan Balance | 11,887 | 13,572 | 11,887
ACL Balance | 2,953 | 2,960 | 2,963
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan Balance | 67,651 | 79,444 | 67,651
ACL Balance | 1,408 | 1,791 |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan Balance | 17 | 32 | 17
ACL Balance | 0 | 0 | 0
Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan Balance | 18,665 | 19,252 | $ 18,665
ACL Balance | $ 167 | $ 171 |

X
- Definition Allowance for loan and lease losses acquisition related allowance for credit loss purchased with credit deterioration. + References No definition available. + Details
Name: | cofs_AllowanceForLoanAndLeaseLossesAcquisitionRelatedAllowanceForCreditLossPurchasedWithCreditDeterioration
Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loans and lease receivable outstanding balance on PCD loans. + References No definition available. + Details
Name: | cofs_LoansAndLeaseReceivableOutstandingBalanceOnPCDLoans
Namespace Prefix: | cofs_
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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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