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EARNINGS PER SHARE (Details Narrative) - shares			3 Months Ended		9 Months Ended
	May 31, 2018	May 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Dilutive stock options excluded in calculation of earnings per share			0	0	13,500	0
Stock dividend issued	5.00%	5.00%				5.00%

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- Definition

Information pertaining to stock dividend issued.

+ References

No definition available.

+ Details

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Namespace Prefix:	cofs_
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Balance Type:	na
Period Type:	duration

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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Balance Type:	na
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