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Note 7 - Other Real Estate Owned (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Other Real Estate Owned [Table Text Block] |
(Dollars in thousands) |  | 2020 |  |  | 2019 |  |  | 2018 |
Balance, beginning of year |  | $ | 929 |  |  | $ | 102 |  |  | $ | 106 |
Transfers from loans |  |  | 391 |  |  |  | 347 |  |  |  | 432 |
Additions from merger |  |  | 346 |  |  |  | 1,364 |  |  |  | - |
Proceeds from sales |  |  | (1,384 | ) |  |  | (938 | ) |  |  | (515 | )
Write-downs |  |  | (80 | ) |  |  | - |  |  |  | - |
Gains on sales |  |  | 64 |  |  |  | 54 |  |  |  | 79 |
Balance, end of year |  | $ | 266 |  |  | $ | 929 |  |  | $ | 102 |

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- Definition Tabular disclosure of other real estate owned. + References No definition available. + Details
Name: | cofs_OtherRealEstateOwnedTableTextBlock
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