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Federal Home Loan Bank Advances (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Advances from Federal Home Loan Bank | $ 18,363 us-gaap_AdvancesFromFederalHomeLoanBanks | $ 6,392 us-gaap_AdvancesFromFederalHomeLoanBanks
Short Term Federal Home Loan Bank Advances [Member] |  |
Advances from Federal Home Loan Bank | 18,000 us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = cofs_ShortTermFederalHomeLoanBankAdvancesMember | 6,000 us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = cofs_ShortTermFederalHomeLoanBankAdvancesMember
Interest rate, lower range | 0.30%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeFrom / us-gaap_DebtInstrumentAxis = cofs_ShortTermFederalHomeLoanBankAdvancesMember | 0.39%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeFrom / us-gaap_DebtInstrumentAxis = cofs_ShortTermFederalHomeLoanBankAdvancesMember
Interest rate, upper range | 0.38%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeTo / us-gaap_DebtInstrumentAxis = cofs_ShortTermFederalHomeLoanBankAdvancesMember | 0.41%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeTo / us-gaap_DebtInstrumentAxis = cofs_ShortTermFederalHomeLoanBankAdvancesMember
Weighted average interest rate | 0.35%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = cofs_ShortTermFederalHomeLoanBankAdvancesMember | 0.40%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = cofs_ShortTermFederalHomeLoanBankAdvancesMember
Maturity date, lower range | 2015-01 | 2014-02
Maturity date, upper range | 2015-11 | 2014-05
Long Term Federal Home Loan Bank Advances [Member] |  |
Advances from Federal Home Loan Bank | $ 363 us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = cofs_LongTermFederalHomeLoanBankAdvancesMember | $ 392 us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = cofs_LongTermFederalHomeLoanBankAdvancesMember
Fixed Interest rate | 3.98%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_DebtInstrumentAxis = cofs_LongTermFederalHomeLoanBankAdvancesMember | 3.98%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_DebtInstrumentAxis = cofs_LongTermFederalHomeLoanBankAdvancesMember
Maturity date, lower range | 2024-11 |

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- Definition Discloses the date of maturity, when only one maturity date applies. for the advances from the Federal Home Loan Bank, as of the Balance Sheet date. + References No definition available. + Details
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- Definition Discloses the call date for the advances from the Federal Home Loan Bank, as of the Balance Sheet date. + References No definition available. + Details
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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Discloses the lowest interest rate applicable to any of the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Discloses the highest interest rate applicable to any of the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Describes the weighted average interest rate applicable to the specific advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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