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Note 21 - Business Combination - Pro Forma Information (Details) - Community Shores Bank Corp ("Community Shores") [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net interest income	$ 54,357	$ 51,266
Noninterest income	23,462	14,722
Noninterest expense	55,182	49,865
Net income	$ 15,257	$ 14,250
Net income per diluted share (in dollars per share)	$ 1.96	$ 1.83

X

- Definition

The pro forma net interest income for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

No definition available.

+ Details

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X

- Definition

The pro forma noninterest expense for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	cofs_
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X

- Definition

The pro forma noninterest income for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

No definition available.

+ Details

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X

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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