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Note 19 - Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Impaired Loans	$ 2,846	$ 5,433
Other Real Estate	0	194
Fair Value, Inputs, Level 1 [Member]
Impaired Loans	0	0
Other Real Estate	0	0
Fair Value, Inputs, Level 2 [Member]
Impaired Loans	0	0
Other Real Estate	0	0
Fair Value, Inputs, Level 3 [Member]
Impaired Loans	2,846	5,433
Other Real Estate	$ 0	$ 194

X

- Definition

Represents amount of fair value disclosure of impaired loans.

+ References

No definition available.

+ Details

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

X

- Definition

Represents fair value of other real estate.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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X

- Details

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