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Loans and Allowance for Credit Losses - Schedule of Information Regarding Credit Exposure (Parenthetical) (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Receivables [Abstract]
Financing receivable originated checking accounts writeoffs	$ 311	$ 221	$ 480
Financing receivable originated checking accounts writeoffs annualized	$ 628	$ 442

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- Definition

Financing receivable originated checking accounts writeoffs.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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- Definition

Financing receivable originated checking accounts writeoffs annualized.

+ References

No definition available.

+ Details

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Namespace Prefix:	cofs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration