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Note 3 - Loans and Allowance for Loan Losses (Details Textual)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Modifications, Number of Contracts	1	7
Past Due 30 Days or More [Member]
Financing Receivable, Modifications, Number of Contracts	0

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=cofs_PastDue30DaysOrMoreMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: