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Allowance for Loan Losses - Credit Exposures by Internally Assigned Grades (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade $ 741,548us-gaap_NotesReceivableNet $ 707,769us-gaap_NotesReceivableNet
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 700,407us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
660,308us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 15,959us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
12,190us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 25,182us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
32,922us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade   2,349us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Commercial and Agriculture [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 114,186us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialAndAgricultureMember
115,875us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialAndAgricultureMember
Commercial and Agriculture [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 107,903us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialAndAgricultureMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
107,923us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialAndAgricultureMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial and Agriculture [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 3,446us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialAndAgricultureMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
2,038us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialAndAgricultureMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial and Agriculture [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 2,837us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialAndAgricultureMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
5,914us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialAndAgricultureMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 143,014us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateOwnerOccupiedMember
161,014us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate Owner Occupied [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 128,222us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
143,531us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Real Estate Owner Occupied [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 5,492us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
4,334us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial Real Estate Owner Occupied [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 9,300us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
13,149us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial Real Estate Non Owner Occupied [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 308,666us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateNonOwnerOccupiedMember
282,832us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateNonOwnerOccupiedMember
Commercial Real Estate Non Owner Occupied [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 298,237us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateNonOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
272,407us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateNonOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Real Estate Non Owner Occupied [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 6,305us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateNonOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
4,811us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateNonOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial Real Estate Non Owner Occupied [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 4,124us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateNonOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
5,614us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_CommercialRealEstateNonOwnerOccupiedMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 110,341us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
110,210us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Residential Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 100,810us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
98,700us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Residential Real Estate [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 697us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
986us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Residential Real Estate [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 8,834us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
8,175us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Residential Real Estate [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade   2,349us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Real Estate Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 59,644us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_RealEstateConstructionMember
35,516us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_RealEstateConstructionMember
Real Estate Construction [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 59,584us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
35,495us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Real Estate Construction [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 19us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
21us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Real Estate Construction [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 41us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
 
Consumer and Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 5,697us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_ConsumerAndOtherMember
2,322us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_ConsumerAndOtherMember
Consumer and Other [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade 5,651us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_ConsumerAndOtherMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
2,252us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_ConsumerAndOtherMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Consumer and Other [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans with credit exposures as assigned an internal risk grade $ 46us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_ConsumerAndOtherMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
$ 70us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcza_ConsumerAndOtherMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember