XML 83 R73.htm IDEA: XBRL DOCUMENT v3.25.0.1

Loans and Allowance for Credit Losses - Summary of Amortized Cost Basis Loans Modified To Borrowers Experiencing On Financing Receivable (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 121,000	$ 189,000
Term Extension	121,000	189,000
Current [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Term Extension	0	60,000
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	121,000	129,000
Commercial and Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 60,000
% of Total Class of Financing Receivable		0.00%
Term Extension		$ 60,000
Commercial and Industrial [Member] | Troubled Loan Modifications [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Term Extension		60,000
Commercial and Industrial [Member] | Current [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Term Extension		60,000
Commercial and Industrial [Member] | 30-89 days [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Term Extension		0
Commercial and Industrial [Member] | Greater than 90 days [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Term Extension		0
Residential Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 121,000	$ 129,000
% of Total Class of Financing Receivable	0.00%	0.00%
Term Extension	$ 121,000	$ 129,000
Residential Real Estate [Member] | Troubled Loan Modifications [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Term Extension	121,000	129,000
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	121,000	129,000
Commercial And Industrial And Residential Real Estate Portfolio Segment | Troubled Loan Modifications [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Term Extension	$ 121,000	$ 189,000

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: