CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 5,695us-gaap_NetIncomeLoss	$ 5,094us-gaap_NetIncomeLoss	$ 4,262us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	100us-gaap_ProvisionForLoanAndLeaseLosses	300us-gaap_ProvisionForLoanAndLeaseLosses	2,515us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation	986us-gaap_Depreciation	927us-gaap_Depreciation	900us-gaap_Depreciation
Amortization	1,493us-gaap_AdjustmentForAmortization	1,636us-gaap_AdjustmentForAmortization	1,569us-gaap_AdjustmentForAmortization
Compensation expense on employee stock purchases and restricted stock units	60us-gaap_ShareBasedCompensation	22us-gaap_ShareBasedCompensation	11us-gaap_ShareBasedCompensation
Net gains on sales of securities	(311)us-gaap_GainLossOnSaleOfSecuritiesNet	(137)us-gaap_GainLossOnSaleOfSecuritiesNet	(419)us-gaap_GainLossOnSaleOfSecuritiesNet
Gains on sales of loans	(1,023)us-gaap_GainLossOnSaleOfLoansAndLeases	(1,566)us-gaap_GainLossOnSaleOfLoansAndLeases	(1,634)us-gaap_GainLossOnSaleOfLoansAndLeases
Loans originated for sale	(29,850)	(42,906)	(44,889)
Proceeds from loan sales	29,561	45,204	45,622
Earnings on bank-owned life insurance	(302)us-gaap_BankOwnedLifeInsuranceIncome	(299)us-gaap_BankOwnedLifeInsuranceIncome	(447)us-gaap_BankOwnedLifeInsuranceIncome
Gains on sales of other real estate owned	(24)	(122)	(51)
Write-downs of other real estate owned	154cofs_WriteDownsOfOtherRealEstateOwned	926cofs_WriteDownsOfOtherRealEstateOwned	405cofs_WriteDownsOfOtherRealEstateOwned
Proceeds from sales of other real estate owned	789	1,604	1,259
Deferred federal income tax (benefit)/expense	(460)	59	(132)
Net changes in other assets	(380)	289	667
Net changes in other liabilities	985	(667)	4
Net cash from operating activities	7,473	10,364	9,642
Cash flows from investing activities:
Sales of securities available for sale	24,766	8,790	9,369
Maturities, prepayments and calls of securities available for sale	11,427	26,072	39,098
Purchases of securities available for sale	(41,770)	(40,687)	(69,564)
Purchase of Federal Reserve Bank Stock			(1)
Calls of FHLB stock	565
Purchase of bank-owned life insurance policies	(1,500)
Loan originations and payments, net	(31,370)	(6,812)	5,065
Proceeds from life insurance			311
Additions to premises and equipment	(786)	(801)	(921)
Net cash from investing activities	(38,668)	(13,438)	(16,643)
Cash flows from financing activities:
Net change in deposits	16,701us-gaap_IncreaseDecreaseInDeposits	(6,072)us-gaap_IncreaseDecreaseInDeposits	20,834us-gaap_IncreaseDecreaseInDeposits
Net change in repurchase agreements	710	6,461	(2,297)
Proceeds from Federal Home Loan Bank advances	87,700	7,000
Payments on Federal Home Loan Bank advances	(75,729)	(1,028)	(8,027)
Issuance of common stock	132	130	123
Repurchase of common stock	(203)	(192)	(75)
Cash dividends	(1,945)us-gaap_PaymentsOfDividends	(1,780)us-gaap_PaymentsOfDividends	(1,648)us-gaap_PaymentsOfDividends
Net cash from financing activities	27,366	4,519	8,910
Net change in cash and cash equivalents	(3,829)	1,445	1,909
Beginning cash and cash equivalents	20,479	19,034	17,125
Ending cash and cash equivalents	16,650	20,479	19,034
Supplemental disclosures of cash flow information:
Cash paid for interest	1,161us-gaap_InterestPaidNet	1,456us-gaap_InterestPaidNet	2,625us-gaap_InterestPaidNet
Cash paid for income taxes	1,760us-gaap_IncomeTaxesPaidNet	2,000us-gaap_IncomeTaxesPaidNet	1,425us-gaap_IncomeTaxesPaidNet
Loans transferred to other real estate owned	561cofs_LoansTransferredToOtherRealEstate	897cofs_LoansTransferredToOtherRealEstate	1,718cofs_LoansTransferredToOtherRealEstate
Other real estate owned transferred to premises and equipment			$ 20

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Amount of cash outflow to acquire Federal Reserve Bank (FRB) stock.

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The cash flow from investments sold under the agreement to repurchase such investment.

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