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Loans and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 NumberOfLoans | Dec. 31, 2013 NumberOfLoans
Financing Receivable, Modifications [Line Items] |  |
Number of loans TDRs | 8 cofs_NumberOfLoans | 7 cofs_NumberOfLoans
Pre-Modification Outstanding Recorded Investment | $ 1,909 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 | $ 1,276 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post Modification Oustanding Recorded Investment | 1,909 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 | 1,276 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Number of loans with payment default | 8 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 5 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Post Modification Oustanding Recorded Investment - past due for 30 days or more | 1,702 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 | 673 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans TDRs | 1 cofs_NumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember | 1 cofs_NumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember
Pre-Modification Outstanding Recorded Investment | 32 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember | 216 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember
Post Modification Oustanding Recorded Investment | 32 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember | 216 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember
Consumer [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans with payment default |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Post Modification Oustanding Recorded Investment - past due for 30 days or more |  | 29 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans TDRs | 5 cofs_NumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 4 cofs_NumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Pre-Modification Outstanding Recorded Investment | 1,596 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 948 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Post Modification Oustanding Recorded Investment | 1,596 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 948 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Number of loans with payment default | 6 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Post Modification Oustanding Recorded Investment - past due for 30 days or more | 1,592 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 573 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Residential Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans TDRs | 2 cofs_NumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 2 cofs_NumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Pre-Modification Outstanding Recorded Investment | 281 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 112 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Post Modification Oustanding Recorded Investment | 281 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 112 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Number of loans with payment default | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Post Modification Oustanding Recorded Investment - past due for 30 days or more | $ 110 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | $ 71 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember

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