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Note 19 - Off-balance Sheet Activities (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Credit Risk, Concentrations [Table Text Block] |
|  | 2020 |  |  | 2019 |
|  | Fixed |  |  | Variable |  |  | Fixed |  |  | Variable |
(Dollars in thousands) |  | Rate |  |  | Rate |  |  | Rate |  |  | Rate |
Unused lines of credit and letters of credit |  | $ | 48,622 |  |  | $ | 231,667 |  |  | $ | 38,064 |  |  | $ | 177,447 |
Commitments to fund loans (at market rates) |  |  | 10,691 |  |  |  | 3,954 |  |  |  | 18,216 |  |  |  | 4,580 |

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- Definition Tabular disclosure of contractual amount of financial instruments with off-balance sheet risk. + References No definition available. + Details
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Namespace Prefix: | cofs_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration