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Condensed Financial Statements of Parent Company (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income before income tax									$ 7,771us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	$ 6,877us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	$ 5,605us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit									(2,076)us-gaap_IncomeTaxExpenseBenefit	(1,783)us-gaap_IncomeTaxExpenseBenefit	(1,343)us-gaap_IncomeTaxExpenseBenefit
Net income	1,556us-gaap_NetIncomeLoss	1,554us-gaap_NetIncomeLoss	1,337us-gaap_NetIncomeLoss	1,248us-gaap_NetIncomeLoss	1,346us-gaap_NetIncomeLoss	1,201us-gaap_NetIncomeLoss	1,312us-gaap_NetIncomeLoss	1,235us-gaap_NetIncomeLoss	5,695us-gaap_NetIncomeLoss	5,094us-gaap_NetIncomeLoss	4,262us-gaap_NetIncomeLoss
Parent Company [Member]
Interest and dividends from ChoiceOne Bank									2,731cofs_InterestAndDividendsFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,399cofs_InterestAndDividendsFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,710cofs_InterestAndDividendsFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest and dividends from other securities									16us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	19us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	16us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income									27us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total income									2,774us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,419us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,726us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expenses									92us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	98us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	89us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income tax									2,682us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,321us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,637us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit									21us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	31us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	29us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before equity in undistributed net income of subsidiary									2,703cofs_IncomeLossFromContinuingOperationsBeforeIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,352cofs_IncomeLossFromContinuingOperationsBeforeIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,666cofs_IncomeLossFromContinuingOperationsBeforeIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed net income of subsidiary									2,992us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,742us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,596us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income									$ 5,695us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 5,094us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 4,262us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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