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Note 6 - Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Impaired Loans	$ 5,089	$ 5,922
Other Real Estate	676	929
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	5,089	5,922
Other Real Estate	$ 676	$ 929

X

- Definition

Represents amount of fair value disclosure of impaired loans.

+ References

No definition available.

+ Details

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X

- Definition

Represents fair value of other real estate.

+ References

No definition available.

+ Details

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Namespace Prefix:	cofs_
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X

- Details

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- Details

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- Details

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