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Note 7 - Other Real Estate Owned (Details Textual) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Ending Balance | $ 61,000 | $ 175,000 | $ 102,000
Commercial Real Estate Loans | $ 205,000 | $ 754,000 |

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- Definition Amount of investment in mortgage loan on commercial real estate. + References No definition available. + Details
Name: | cofs_CommercialRealEstateLoans
Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column G)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
Name: | us-gaap_MortgageLoansOnRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant