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Allowance for Loan Losses - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Loans
SecurityLoan
Dec. 31, 2013
SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Historical loss percentage period for portfolio segments 3 years  
Allowance for loan losses $ 14,268us-gaap_LoansAndLeasesReceivableAllowance $ 16,528us-gaap_LoansAndLeasesReceivableAllowance
Number Of Loans Charged Off 11fcza_NumberOfLoansChargedOff  
Provision for loan losses 1,500us-gaap_ProvisionForLoanAndLeaseLosses 1,100us-gaap_ProvisionForLoanAndLeaseLosses
Number of days past due for loans to be considered as nonperforming 90 days  
Reasonable period for nonperforming TDRs to be returned to performing status 6 months  
Number of days reaching where loans are considered for nonaccrual status 90 days  
Conditions where loans are considered for nonaccrual status A loan may be returned to accruing status only if one of three conditions are met the loan is well-secured and none of the principal and interest has been past due for a minimum of 90 days; the loan is a TDR and has made a minimum of six months payments; or the principal and interest payments are reasonably assured and a sustained period of performance has occurred, generally six months.  
Defaulted loans 0fcza_NumberOfDefaultsOnLoans 0fcza_NumberOfDefaultsOnLoans
Impaired loans Greater than $500  
Company Collateral [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision for loan losses 1,436us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CompanyCollateralMember		  
TDRs [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for loan losses $ 895us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fcza_TroubledDebtRestructuresMember