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Commitments, Contingencies and Off-Balance-Sheet Risk - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	$ 9,609fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate	$ 12,084fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate
Variable Rate	183,847fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate	174,827fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate
Lines of Credit and Construction Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	9,405fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = fcza_LinesOfCreditAndConstructionLoansMember	11,866fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = fcza_LinesOfCreditAndConstructionLoansMember
Variable Rate	160,718fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = fcza_LinesOfCreditAndConstructionLoansMember	151,332fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = fcza_LinesOfCreditAndConstructionLoansMember
Overdraft Protection [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	4fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = fcza_OverdraftProtectionMember	18fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = fcza_OverdraftProtectionMember
Variable Rate	22,122fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = fcza_OverdraftProtectionMember	21,084fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = fcza_OverdraftProtectionMember
Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	200fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember	200fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember
Variable Rate	$ 1,007fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember	$ 2,411fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember

X

- Definition

Concentration risk credit risk financial instruments off balance sheet risk asset at fixed rate.

+ References

No definition available.

+ Details

Name:	fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate
Namespace Prefix:	fcza_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Concentration risk credit risk financial instruments off balance sheet risk asset at variable rate.

+ References

No definition available.

+ Details

Name:	fcza_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate
Namespace Prefix:	fcza_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CreditFacilityAxis=fcza_LinesOfCreditAndConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=fcza_OverdraftProtectionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: