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STOCKHOLDERS' EQUITY (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Total capital (to risk weighted assets):      
Actual, Amount $ 45,943us-gaap_Capital $ 44,601us-gaap_Capital  
Actual, Ratio (as a percent) 19.00%us-gaap_CapitalToRiskWeightedAssets 19.00%us-gaap_CapitalToRiskWeightedAssets  
For Capital Adequacy Purposes, Amount 18,854us-gaap_CapitalRequiredForCapitalAdequacy 18,768us-gaap_CapitalRequiredForCapitalAdequacy  
For Capital Adequacy Purposes, Ratio (as a percent) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets  
Tier I capital (to risk weighted assets):      
Actual, Amount 43,644us-gaap_TierOneRiskBasedCapital 41,665us-gaap_TierOneRiskBasedCapital  
Actual, Ratio (as a percent) 19.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 18.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets  
For Capital Adequacy Purposes, Amount 9,427us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy 9,384us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy  
For Capital Adequacy Purposes, Ratio (as a percent) 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets  
Tier I capital (to average assets):      
Actual, Amount 43,644us-gaap_TierOneLeverageCapital 41,665us-gaap_TierOneLeverageCapital  
Actual, Ratio (as a percent) 11.00%us-gaap_TierOneLeverageCapitalToAverageAssets 11.00%us-gaap_TierOneLeverageCapitalToAverageAssets  
For Capital Adequacy Purposes, Amount 15,779us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy 15,600us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy  
For Capital Adequacy Purposes, Ratio (as a percent) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets  
Dividend Limitation      
Dividends paid on common stock 171,744us-gaap_PaymentsOfDividendsCommonStock 171,744us-gaap_PaymentsOfDividendsCommonStock 169,242us-gaap_PaymentsOfDividendsCommonStock
Dividend payout rate per common share (in dollars per share) $ 0.08czbs_CommonStockDividendsPayoutRatePerShare $ 0.08czbs_CommonStockDividendsPayoutRatePerShare  
Cash dividends paid on preferred stock issued to the Treasury 236,820us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock 236,820us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock 236,820us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Subsidiaries [Member]      
Total capital (to risk weighted assets):      
Actual, Amount 45,500us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
44,376us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Actual, Ratio (as a percent) 19.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
19.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
For Capital Adequacy Purposes, Amount 18,822us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
18,779us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
For Capital Adequacy Purposes, Ratio (as a percent) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 23,527us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
23,473us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent) 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Tier I capital (to risk weighted assets):      
Actual, Amount 43,201us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
41,441us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Actual, Ratio (as a percent) 18.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
18.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
For Capital Adequacy Purposes, Amount 9,411us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
9,389us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
For Capital Adequacy Purposes, Ratio (as a percent) 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 14,116us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
14,084us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent) 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Tier I capital (to average assets):      
Actual, Amount 43,201us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
41,441us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Actual, Ratio (as a percent) 11.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
11.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
For Capital Adequacy Purposes, Amount 15,763us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
15,634us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
For Capital Adequacy Purposes, Ratio (as a percent) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 19,704us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 19,543us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent) 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Subsidiaries [Member] | Minimum [Member]      
Dividend Limitation      
Dividend payments approval by the regulatory agencies as a percentage of subsidiary net income for the prior period 50.00%czbs_DividendPaymentsApprovalByRegulatoryAgenciesAsPercentageOfSubsidiaryNetIncomeForPriorPeriod
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember