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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Significant Accounting Policies [Line Items] |  |
Allowance for loan losses related to commercial loans and real estate loans | 500 fcza_MinimumAmountOfImpairedLoansTestedForImpairment |
Number of days reaching which loans are considered for nonaccrual status | 90 days |
Other assets | 8,209 us-gaap_OtherAssets | 9,350 us-gaap_OtherAssets
Federal Home Loan Bank par value | 100 fcza_FederalHomeLoanBankCapitalStockParValue |
Number of operating segments | 1 us-gaap_NumberOfOperatingSegments |
Other Real Estate Owned [Member] |  |
Significant Accounting Policies [Line Items] |  |
Other assets | 560 us-gaap_OtherAssets / us-gaap_FairValueByAssetClassAxis = fcza_OtherRealEstateOwnedMember | 173 us-gaap_OtherAssets / us-gaap_FairValueByAssetClassAxis = fcza_OtherRealEstateOwnedMember
Unsecured Debt [Member] |  |
Significant Accounting Policies [Line Items] |  |
Retail loans past due charge off period | 90 days |
Secured Debt [Member] |  |
Significant Accounting Policies [Line Items] |  |
Residential real estate loans past due assessment of value period | 180 days |
Other Debt [Member] |  |
Significant Accounting Policies [Line Items] |  |
Loans past due charged down to the net realizable value period | 90 days |
Maximum [Member] |  |
Significant Accounting Policies [Line Items] |  |
Percentage of insurance commission revenue of total revenue | 1.00%fcza_PercentageOfInsuranceCommissionRevenueOfRevenue / us-gaap_RangeAxis = us-gaap_MaximumMember | 1.00%fcza_PercentageOfInsuranceCommissionRevenueOfRevenue / us-gaap_RangeAxis = us-gaap_MaximumMember
Original maturities for cash and cash equivalents | 90 days |
Estimated useful life of intangible assets | 12 years |
Maximum [Member] | Furniture and equipment [Member] |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful life of asset | 7 years |
Maximum [Member] | Buildings and improvements [Member] |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful life of asset | 50 years |
Minimum [Member] |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful life of intangible assets | 5 years |
Minimum [Member] | Furniture and equipment [Member] |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful life of asset | 3 years |
Minimum [Member] | Buildings and improvements [Member] |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful life of asset | 7 years |
Water St. [Member] | Maximum [Member] |  |
Significant Accounting Policies [Line Items] |  |
Percentage of insurance commission revenue of total revenue | 1.00%fcza_PercentageOfInsuranceCommissionRevenueOfRevenue / dei_LegalEntityAxis = fcza_WaterStMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 1.00%fcza_PercentageOfInsuranceCommissionRevenueOfRevenue / dei_LegalEntityAxis = fcza_WaterStMember / us-gaap_RangeAxis = us-gaap_MaximumMember

X
- Definition Number of days for demand deposits with financial institutions to be considered cash and cash equivalent. + References No definition available. + Details
Name: | fcza_CashAndCashEquivalentMaturityPeriod
Namespace Prefix: | fcza_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Par value of Federal Home Loan Bank Stock. + References No definition available. + Details
Name: | fcza_FederalHomeLoanBankCapitalStockParValue
Namespace Prefix: | fcza_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum balance requirement to perform detailed loan review. + References No definition available. + Details
Name: | fcza_MinimumAmountOfImpairedLoansTestedForImpairment
Namespace Prefix: | fcza_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of insurance commission revenue of total revenue. + References No definition available. + Details
Name: | fcza_PercentageOfInsuranceCommissionRevenueOfRevenue
Namespace Prefix: | fcza_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of days a loan must be delinquent to be considered nonaccrual. + References No definition available. + Details
Name: | fcza_PeriodOfDelinquencyAfterWhichLoansAreConsideredNonaccrual
Namespace Prefix: | fcza_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of days secured residential real estate loans are past due to receive an assessment of value. + References No definition available. + Details
Name: | fcza_PeriodPastDueLoanAssessmentOfValue
Namespace Prefix: | fcza_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of days unsecured loans are past due to recognize charge off. + References No definition available. + Details
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Namespace Prefix: | fcza_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of days all other loans are past due to recognize an impairment. + References No definition available. + Details
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Namespace Prefix: | fcza_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 7 + Details
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Balance Type: | debit
Period Type: | instant

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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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