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Repurchase Agreements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Disclosure of Repurchase Agreements [Abstract] |  |
Outstanding balance at December 31 | $ 26,743 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase | $ 26,033 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Average interest rate at December 31 | 0.19%cofs_WeightedAverageRate | 0.22%cofs_WeightedAverageRate
Average balance during the year | 22,594 cofs_AverageBalanceSecuritiesSold | 19,456 cofs_AverageBalanceSecuritiesSold
Average interest rate during the year | 0.20%cofs_AverageInterestRatePaidDuringYear | 0.23%cofs_AverageInterestRatePaidDuringYear
Maximum month end balance during the year | $ 28,719 cofs_MaximumMonthEndBalance | $ 26,995 cofs_MaximumMonthEndBalance

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- Definition The calculated average balance during the year. + References No definition available. + Details
Name: | cofs_AverageBalanceSecuritiesSold
Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The calculated average interest rate paid during the year. + References No definition available. + Details
Name: | cofs_AverageInterestRatePaidDuringYear
Namespace Prefix: | cofs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum month end balance of securities sold under repurchase agreements. + References No definition available. + Details
Name: | cofs_MaximumMonthEndBalance
Namespace Prefix: | cofs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The calculated weighted average interest rate. + References No definition available. + Details
Name: | cofs_WeightedAverageRate
Namespace Prefix: | cofs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + 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(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 1 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=45278096&loc=d3e9760-107771 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant