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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 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Impaired Loans | $ 5,296 | $ 5,922
Other Real Estate | 854 | 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 | 5,296 | 5,922
Other Real Estate | $ 854 | $ 929

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- Definition Represents amount of fair value disclosure of impaired loans. + References No definition available. + Details
Name: | cofs_ImpairedLoansFairValueDisclosure
Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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

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- Details
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- Details
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- Details
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Data Type: | na
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- Details
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