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Commitments, Contingencies and Off-Balance-Sheet Risk - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
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 $ 3,259fcza_AverageReserveBalanceUnderFederalReserveBoardRequirements $ 2,959fcza_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