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Deposits (Details Narrative) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deposits [Abstract] |  |
Certificates of deposit $100,000 or more | $ 57,000 us-gaap_TimeDeposits100000OrMore | $ 66,900 us-gaap_TimeDeposits100000OrMore
Certificates of Deposit issued through CDARS | $ 3,100 cofs_CertificatesOfDepositIssuedThroughCdars | $ 4,100 cofs_CertificatesOfDepositIssuedThroughCdars

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- Definition Certificates of deposit issued through the Certificate of Deposit Account Registry Service (CDARS). + References No definition available. + Details
Name: | cofs_CertificatesOfDepositIssuedThroughCdars
Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph A -Subparagraph 4 + Details
Name: | us-gaap_TimeDeposits100000OrMore
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant