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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