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Commitments, Contingencies and Off-Balance-Sheet Risk - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Maximum period of commitments to make loans | 1 year |
Maximum time period of maturities | 30 years |
Average reserve balance under Federal Reserve Board requirements | $ 3,259 fcza_AverageReserveBalanceUnderFederalReserveBoardRequirements | $ 2,959 fcza_AverageReserveBalanceUnderFederalReserveBoardRequirements
Minimum [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Range of fixed interest rate loan commitments | 3.05%fcza_RangeOfFixedInterestRateLoanCommitments / us-gaap_RangeAxis = us-gaap_MinimumMember | 3.05%fcza_RangeOfFixedInterestRateLoanCommitments / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Range of fixed interest rate loan commitments | 8.75%fcza_RangeOfFixedInterestRateLoanCommitments / us-gaap_RangeAxis = us-gaap_MaximumMember | 13.75%fcza_RangeOfFixedInterestRateLoanCommitments / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Average reserve balance under federal reserve board requirements. + References No definition available. + Details
Name: | fcza_AverageReserveBalanceUnderFederalReserveBoardRequirements
Namespace Prefix: | fcza_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Maximum credit commitments maturities period description. + References No definition available. + Details
Name: | fcza_CreditCommitmentsMaturitiesPeriod
Namespace Prefix: | fcza_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum period to commit loan description. + References No definition available. + Details
Name: | fcza_MaximumPeriodToCommitLoan
Namespace Prefix: | fcza_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Range of fixed interest rate loan commitments. + References No definition available. + Details
Name: | fcza_RangeOfFixedInterestRateLoanCommitments
Namespace Prefix: | fcza_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |