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Other Real Estate Owned (Tables) | 12 Months Ended
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Dec. 31, 2019
Other Real Estate [Abstract] |
Schedule of other real estate owned | Activity within other real estate owned was as follows:
(Dollars in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Balance, beginning of year |  | $ | 102 |  |  | $ | 106 |  |  | $ | 437 |
Transfers from loans |  |  | 347 |  |  |  | 432 |  |  |  | 314 |
Acquisition from County Bank Corp |  |  | 1,364 |  |  |  | — |  |  |  | — |
Proceeds from sales |  |  | (938 | ) |  |  | (515 | ) |  |  | (663 | )
Gains/(losses) on sales |  |  | 54 |  |  |  | 79 |  |  |  | 18 |
Balance, end of year |  | $ | 929 |  |  | $ | 102 |  |  | $ | 106 |

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- Definition Tabular disclosure of activity in other real estate owned. + 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_OtherRealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration