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Note 8 - Deposits (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Time Deposits, $250,000 or More | $ 88,200 | $ 68,300
Interest-bearing and Noninterest-bearing Deposit, Brokered | 0 | 2,287
Certificates of Deposit Issued Through CDARS | $ 12,700 | $ 7,100

X
- Definition Certificates of deposit issued through the Certificate of Deposit Account Registry Service (CDARS). + References No definition available. + Details
Name: | cofs_CertificatesOfDepositIssuedThroughCDARS
Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of interest-bearing and noninterest-bearing third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. + References No definition available. + Details
Name: | cofs_InterestBearingAndNoninterestBearingDepositBrokered
Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $250,000 or more. + References No definition available. + Details
Name: | cofs_TimeDeposits250000OrMore
Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant