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Income Taxes - Effective Tax Rates Differ from Statutory Federal Income Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Income taxes computed at the statutory federal tax rate $ 4,315us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 2,568us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Add (subtract) tax effect of:    
Nontaxable interest income, net of nondeductible interest expense (824)fcza_IncomeTaxReconciliationNontaxableInterestIncomeNetOfNondeductibleInterestExpense (781)fcza_IncomeTaxReconciliationNontaxableInterestIncomeNetOfNondeductibleInterestExpense
Low income housing tax credit (303)fcza_IncomeTaxReconciliationLowIncomeHousingTaxCredit (280)fcza_IncomeTaxReconciliationLowIncomeHousingTaxCredit
Cash surrender value of BOLI (167)fcza_IncomeTaxReconciliationBankOwnedLifeInsuranceIncome (189)fcza_IncomeTaxReconciliationBankOwnedLifeInsuranceIncome
Other 141us-gaap_IncomeTaxReconciliationOtherAdjustments 55us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense $ 3,162us-gaap_IncomeTaxExpenseBenefit $ 1,373us-gaap_IncomeTaxExpenseBenefit