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EMPLOYEE BENEFITS (Details) (USD $)
12 Months Ended
Dec. 31, 2014
N
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]      
Employer matching contribution as a percentage of employee contributions 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent    
Maximum percentage of employee's compensation eligible for employer contribution match 6.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Expenses recognized related to the 401 (k) plan $ 89,000us-gaap_DefinedContributionPlanCostRecognized $ 96,000us-gaap_DefinedContributionPlanCostRecognized $ 98,000us-gaap_DefinedContributionPlanCostRecognized
Number of participants remaining in The Plans 8czbs_DefinedBenefitPlanNumberOfParticipantsRemaining    
Obligation to contribute to Post Retirement Benefit Plan in event of failure to produce positive returns 0czbs_DefinedBenefitPlanBenefitObligationInEventOfFailureToProducePositiveReturns    
Cash surrender value for the contracts 10,082,081us-gaap_CashSurrenderValueOfLifeInsurance 9,948,016us-gaap_CashSurrenderValueOfLifeInsurance  
Amount recognized in noninterest expenses for the SERP and the Post Retirement Benefits Plans 165,000czbs_DefinedBenefitPlanPeriodicNoninterestExpenses 336,000czbs_DefinedBenefitPlanPeriodicNoninterestExpenses 365,000czbs_DefinedBenefitPlanPeriodicNoninterestExpenses
Amount recognized in noninterest income related to the insurance contracts 304,000czbs_DefinedBenefitPlanPeriodicNoninterestIncome 329,000czbs_DefinedBenefitPlanPeriodicNoninterestIncome 342,000czbs_DefinedBenefitPlanPeriodicNoninterestIncome
Expenses incurred related to the Bonus Plan $ 46,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense $ 46,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense $ 65,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense