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CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Interest income |  |
Loans, including fees | $ 3,942 us-gaap_InterestAndFeeIncomeLoansAndLeases | $ 3,824 us-gaap_InterestAndFeeIncomeLoansAndLeases
Securities: |  |
Taxable | 452 us-gaap_InterestIncomeSecuritiesTaxable | 482 us-gaap_InterestIncomeSecuritiesTaxable
Tax exempt | 349 us-gaap_InterestIncomeSecuritiesTaxExempt | 347 us-gaap_InterestIncomeSecuritiesTaxExempt
Other | 3 us-gaap_OtherInterestAndDividendIncome | 3 us-gaap_OtherInterestAndDividendIncome
Total interest income | 4,746 us-gaap_InterestAndDividendIncomeOperating | 4,656 us-gaap_InterestAndDividendIncomeOperating
Interest expense |  |
Deposits | 225 us-gaap_InterestExpenseDeposits | 279 us-gaap_InterestExpenseDeposits
Advances from Federal Home Loan Bank | 19 us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm | 11 us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm
Other | 12 us-gaap_InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase | 13 us-gaap_InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
Total interest expense | 256 us-gaap_InterestExpense | 303 us-gaap_InterestExpense
Net interest income | 4,490 us-gaap_InterestIncomeExpenseNet | 4,353 us-gaap_InterestIncomeExpenseNet
Provision for loan losses | 100 us-gaap_ProvisionForLoanAndLeaseLosses | 100 us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses | 4,390 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 4,253 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Noninterest income |  |
Customer service charges | 983 us-gaap_FeesAndCommissionsDepositorAccounts | 859 us-gaap_FeesAndCommissionsDepositorAccounts
Insurance and investment commissions | 341 us-gaap_InsuranceCommissionsAndFees | 231 us-gaap_InsuranceCommissionsAndFees
Gains on sales of loans | 503 us-gaap_GainLossOnSalesOfLoansNet | 146 us-gaap_GainLossOnSalesOfLoansNet
Net gains on sales of securities | 8 us-gaap_GainLossOnSaleOfSecuritiesNet | 65 us-gaap_GainLossOnSaleOfSecuritiesNet
Net losses on sales and write-downs of other assets | (21)us-gaap_GainLossOnSaleOfOtherAssets | (1)us-gaap_GainLossOnSaleOfOtherAssets
Earnings on life insurance policies | 387 us-gaap_BankOwnedLifeInsuranceIncome | 71 us-gaap_BankOwnedLifeInsuranceIncome
Other | 91 us-gaap_NoninterestIncomeOther | 115 us-gaap_NoninterestIncomeOther
Total noninterest income | 2,294 us-gaap_NoninterestIncome | 1,486 us-gaap_NoninterestIncome
Noninterest expense |  |
Salaries and benefits | 2,299 us-gaap_LaborAndRelatedExpense | 2,084 us-gaap_LaborAndRelatedExpense
Occupancy and equipment | 596 us-gaap_OccupancyNet | 617 us-gaap_OccupancyNet
Data processing | 553 us-gaap_InformationTechnologyAndDataProcessing | 426 us-gaap_InformationTechnologyAndDataProcessing
Professional fees | 277 us-gaap_ProfessionalFees | 197 us-gaap_ProfessionalFees
Supplies and postage | 105 us-gaap_SuppliesAndPostageExpense | 113 us-gaap_SuppliesAndPostageExpense
Advertising and promotional | 67 us-gaap_MarketingAndAdvertisingExpense | 42 us-gaap_MarketingAndAdvertisingExpense
Intangible amortization | 112 us-gaap_AmortizationOfIntangibleAssets | 112 us-gaap_AmortizationOfIntangibleAssets
Loan and collection expense | 44 cofs_LoanAndCollectionExpense | 26 cofs_LoanAndCollectionExpense
FDIC insurance | 78 us-gaap_FederalDepositInsuranceCorporationPremiumExpense | 80 us-gaap_FederalDepositInsuranceCorporationPremiumExpense
Other | 429 us-gaap_OtherNoninterestExpense | 359 us-gaap_OtherNoninterestExpense
Total noninterest expense | 4,561 us-gaap_NoninterestExpense | 4,056 us-gaap_NoninterestExpense
Income before income tax | 2,124 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,683 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense | 482 us-gaap_IncomeTaxExpenseBenefit | 435 us-gaap_IncomeTaxExpenseBenefit
Net income | $ 1,642 us-gaap_NetIncomeLoss | $ 1,248 us-gaap_NetIncomeLoss
Basic earnings per share (Note 4) (in dollars per share) | $ 0.50 us-gaap_EarningsPerShareBasic | $ 0.38 us-gaap_EarningsPerShareBasic
Diluted earnings per share (Note 4) (in dollars per share) | $ 0.50 us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted
Dividends declared per share (in dollars per share) | $ 0.15 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.14 us-gaap_CommonStockDividendsPerShareDeclared

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- Definition Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13 (d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: 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.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.12) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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