XML 67 R57.htm IDEA: XBRL DOCUMENT v3.24.2.u1

Borrowings - Schedule of Federal Home Loan Bank Advances (Parentheticals) (Details)	Jun. 30, 2024
Federal Home Loan Bank Advances Maturing July 2025 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Interest rate	4.88%
Federal Home Loan Bank Advances Maturing January 2026 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Interest rate	4.35%
Federal Home Loan Bank Advances Maturing December 2026 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Interest rate	4.20%

X

- Definition

Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480876/942-470-45-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480848/942-470-50-3

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
Namespace Prefix:	us-gaap_
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

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=cofs_FederalHomeLoanBankAdvancesMaturingJuly2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=cofs_FederalHomeLoanBankAdvancesMaturingJanuary2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=cofs_FederalHomeLoanBankAdvancesMaturingDecember2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: