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Note 10 - Borrowings - Federal Home Loan Bank Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Federal Home Loan Bank Advances Maturing January 2023 [Member]
Total advances outstanding at year-end	$ 50,000	$ 0
Federal Home Loan Bank Advances Maturing January 2022 [Member]
Total advances outstanding at year-end	0	50,000
Federal Home Loan Bank Advances [Member]
Total advances outstanding at year-end	$ 50,000	$ 50,000

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- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

+ Details

Name:	us-gaap_AdvancesFromFederalHomeLoanBanks
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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- Details

Name:	us-gaap_LongtermDebtTypeAxis=cofs_FederalHomeLoanBankAdvancesMaturingJanuary2022Member
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- Details

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