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Note 3 - Loans and Allowance for Loan Losses (Details Textual) | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Mortgage Loans in Process of Foreclosure, Amount | $ 337,000 | $ 173,000
Financing Receivable, Modifications, Number of Contracts | 5 | 0
Financing Receivable, Number of Payment Deferrals | 750 |
Financing Receivable, Deferred Payments | $ 148,000,000 |

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- Definition Deferred amounts on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
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Namespace Prefix: | cofs_
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Balance Type: | debit
Period Type: | instant

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- Definition Number of principal and interest payment deferrals on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
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Namespace Prefix: | cofs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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 http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL49126937-111524 + Details
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