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BUSINESS COMBINATION (Details Narrative) - County Bank Corp [Member] $ in Thousands	Dec. 31, 2018 USD ($)
Business combination, total assets	$ 620,000
Business combination, total loans	360,000
Business combination, total deposits	$ 540,000

X

- Definition

The amount of deposits recognized as of the acquisition date.

+ References

No definition available.

+ Details

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Namespace Prefix:	cofs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of loans recognized as of the acquisition date.

+ References

No definition available.

+ Details

Name:	cofs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans
Namespace Prefix:	cofs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of assets acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cofs_CountyBankCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: