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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 1,642us-gaap_NetIncomeLoss	$ 1,248us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	100us-gaap_ProvisionForLoanAndLeaseLosses	100us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation	244us-gaap_Depreciation	245us-gaap_Depreciation
Amortization	385us-gaap_AdjustmentForAmortization	381us-gaap_AdjustmentForAmortization
Compensation expense on employee stock purchases and restricted stock units	15us-gaap_ShareBasedCompensation	8us-gaap_ShareBasedCompensation
Net gains on sales of securities	(8)us-gaap_GainLossOnSaleOfSecuritiesNet	(65)us-gaap_GainLossOnSaleOfSecuritiesNet
Gains on sales of loans	(503)us-gaap_GainLossOnSaleOfLoansAndLeases	(146)us-gaap_GainLossOnSaleOfLoansAndLeases
Loans originated for sale	(6,772)us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale	(4,107)us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale
Proceeds from loan sales	7,364us-gaap_ProceedsFromSaleOfLoansHeldForSale	4,444us-gaap_ProceedsFromSaleOfLoansHeldForSale
Earnings on bank-owned life insurance	(387)us-gaap_BankOwnedLifeInsuranceIncome	(71)us-gaap_BankOwnedLifeInsuranceIncome
Proceeds on bank-owned life insurance	461us-gaap_ProceedsFromLifeInsurancePolicies
(Gains)/Losses on sales of other real estate owned	(2)us-gaap_GainsLossesOnSalesOfOtherRealEstate	2us-gaap_GainsLossesOnSalesOfOtherRealEstate
Write-downs of other real estate owned	23cofs_WriteDownsOfOtherRealEstateOwned
Proceeds from sales of other real estate owned	58us-gaap_ProceedsFromSaleOfOtherRealEstate	204us-gaap_ProceedsFromSaleOfOtherRealEstate
Deferred federal income tax (benefit)/expense	(175)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(77)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Net changes in other assets	(408)us-gaap_IncreaseDecreaseInOtherOperatingAssets	(148)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Net changes in other liabilities	298us-gaap_IncreaseDecreaseInOtherOperatingLiabilities	134us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash from operating activities	2,335us-gaap_NetCashProvidedByUsedInOperatingActivities	2,152us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:
Sales	1,123us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	4,769us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Maturities, prepayments and calls	1,157us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2,016us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Purchases	(9,441)us-gaap_PaymentsToAcquireAvailableForSaleSecurities	(13,940)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Loan originations and payments, net	7,690us-gaap_PaymentsForProceedsFromLoansAndLeases	(4,996)us-gaap_PaymentsForProceedsFromLoansAndLeases
Additions to premises and equipment	(147)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(197)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash from investing activities	382us-gaap_NetCashProvidedByUsedInInvestingActivities	(12,348)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:
Net change in deposits	(5,746)us-gaap_IncreaseDecreaseInDeposits	10,309us-gaap_IncreaseDecreaseInDeposits
Net change in repurchase agreements	(5,590)us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	(5,727)us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase
Proceeds from Federal Home Loan Bank advances	38,550us-gaap_ProceedsFromFederalHomeLoanBankAdvances	6,000us-gaap_ProceedsFromFederalHomeLoanBankAdvances
Payments on Federal Home Loan Bank advances	(36,033)us-gaap_PaymentsForFederalHomeLoanBankAdvances	(6,007)us-gaap_PaymentsForFederalHomeLoanBankAdvances
Issuance of common stock	35us-gaap_ProceedsFromIssuanceOfCommonStock	32us-gaap_ProceedsFromIssuanceOfCommonStock
Repurchase of common stock	(343)us-gaap_PaymentsForRepurchaseOfCommonStock
Cash dividends	(492)us-gaap_PaymentsOfDividends	(461)us-gaap_PaymentsOfDividends
Net cash from financing activities	(9,619)us-gaap_NetCashProvidedByUsedInFinancingActivities	4,146us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents	(6,902)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(6,050)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Beginning cash and cash equivalents	16,650us-gaap_CashAndCashEquivalentsAtCarryingValue	20,479us-gaap_CashAndCashEquivalentsAtCarryingValue
Ending cash and cash equivalents	9,748us-gaap_CashAndCashEquivalentsAtCarryingValue	14,429us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information:
Cash paid for interest	257us-gaap_InterestPaidNet	307us-gaap_InterestPaidNet
Cash paid for income taxes	320us-gaap_IncomeTaxesPaidNet
Loans transferred to other real estate owned	$ 320cofs_LoansTransferredToOtherRealEstate	$ 246cofs_LoansTransferredToOtherRealEstate

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