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Note 20 - Off-balance Sheet Activities - Off-balance Sheet Risk (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Unused lines of credit and letters of credit - fixed rate | $ 54,523 | $ 63,001
Unused lines of credit and letters of credit - variable rate | 148,497 | 275,170
Commitments to fund loans (at market rates) - fixed rate | 35,789 | 72,257
Commitments to fund loans (at market rates) - variable rate | $ 12,565 | $ 25,545

X
- Definition Reflects the amount of cash required to fund unused lines and letters of credt at stated interest rates. + References No definition available. + Details
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Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reflects the amount of cash required to fund unused lines and letters of credt at variable interest rates. + References No definition available. + Details
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Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=126941378&loc=d3e61044-112788 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126941378&loc=d3e61082-112788 + Details
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Period Type: | duration

X
- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at interest rates that increase or decrease depending on certain facts or circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126941378&loc=d3e61082-112788 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=126941378&loc=d3e61044-112788 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration