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Allowance for Loan Losses - Impaired Financing Receivables - Average Recorded Investment and Interest Income Recognized (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | $ 15,319 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | $ 22,051 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Impaired financing receivables, Interest Income Recognized, Total | 570 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 989 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 3,316 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialAndAgricultureMember | 4,761 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialAndAgricultureMember
Impaired financing receivables, Interest Income Recognized, Total | 104 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialAndAgricultureMember | 186 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialAndAgricultureMember
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 5,720 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialRealEstateOwnerOccupiedMember | 6,064 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialRealEstateOwnerOccupiedMember
Impaired financing receivables, Interest Income Recognized, Total | 219 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialRealEstateOwnerOccupiedMember | 436 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 2,767 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialRealEstateNonOwnerOccupiedMember | 5,855 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialRealEstateNonOwnerOccupiedMember
Impaired financing receivables, Interest Income Recognized, Total | 40 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialRealEstateNonOwnerOccupiedMember | 85 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_CommercialRealEstateNonOwnerOccupiedMember
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 3,510 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 5,038 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Impaired financing receivables, Interest Income Recognized, Total | 207 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 282 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Real Estate Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total |  | 302 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_RealEstateConstructionMember
Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | $ 6 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_ConsumerAndOtherMember | $ 31 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcza_ConsumerAndOtherMember

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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