Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies [Line Items]
Allowance for loan losses related to commercial loans and real estate loans	500
Number of days reaching which loans are considered for nonaccrual status	90 days
Other assets	8,209us-gaap_OtherAssets	9,350us-gaap_OtherAssets
Federal Home Loan Bank par value	100
Number of operating segments	1us-gaap_NumberOfOperatingSegments
Other Real Estate Owned [Member]
Significant Accounting Policies [Line Items]
Other assets	560	173
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%	1.00%
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%	1.00%

Number of days for demand deposits with financial institutions to be considered cash and cash equivalent.

No definition available.

Name:	fcza_CashAndCashEquivalentMaturityPeriod
Namespace Prefix:	fcza_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

- 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

- 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

- 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

- Definition

Number of days secured residential real estate loans are past due to receive an assessment of value.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcza_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of days unsecured loans are past due to recognize charge off.

+ References

No definition available.

+ Details

Name:	fcza_PeriodPastDueLoanChargedOff
Namespace Prefix:	fcza_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of days all other loans are past due to recognize an impairment.

+ References

No definition available.

+ Details

Name:	fcza_PeriodPastDueLoanChargedToNetRealizableValue
Namespace Prefix:	fcza_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=fcza_WaterStMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_FairValueByAssetClassAxis=fcza_OtherRealEstateOwnedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=fcza_OtherDebtMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

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