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Loans and Allowance for Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	$ 346,113us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 315,966us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 311,468us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	41,098us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember	37,048us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember	31,790us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember
Agricultural [Member] | Risk ratings 1 and 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	9,596us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember	8,339us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Agricultural [Member] | Risk ratings 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	24,294us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass1Member	23,036us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass1Member
Agricultural [Member] | Risk ratings 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	6,462us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass2Member	4,330us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass2Member
Agricultural [Member] | Risk ratings 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	683us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember	1,193us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Agricultural [Member] | Risk ratings 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	63us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember	150us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_AgriculturalMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Agricultural [Member] | Risk ratings 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	88,062us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember	68,530us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember	67,365us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember
Commercial and Industrial [Member] | Risk ratings 1 and 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	11,590us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember	7,333us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Commercial and Industrial [Member] | Risk ratings 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	59,470us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass1Member	46,943us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass1Member
Commercial and Industrial [Member] | Risk ratings 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	15,764us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass2Member	12,557us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass2Member
Commercial and Industrial [Member] | Risk ratings 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	976us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember	1,025us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Commercial and Industrial [Member] | Risk ratings 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	262us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember	608us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial and Industrial [Member] | Risk ratings 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans		64us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cofs_FinancingReceivableCommercialAndIndustrialMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	99,807us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	96,987us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	93,312us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate [Member] | Risk ratings 1 and 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	3,576us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember	3,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Commercial Real Estate [Member] | Risk ratings 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	58,600us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass1Member	53,681us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass1Member
Commercial Real Estate [Member] | Risk ratings 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	28,557us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass2Member	27,610us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = cofs_Pass2Member
Commercial Real Estate [Member] | Risk ratings 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	4,490us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember	6,813us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Commercial Real Estate [Member] | Risk ratings 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans	4,584us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember	5,818us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial Real Estate [Member] | Risk ratings 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Risk rated loans		$ 65us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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