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Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale    
Amortized Cost $ 63,343us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 63,637us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Gross Unrealized Gains 236czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax 155czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
Gross Unrealized Losses 988czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax 1,603czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
Estimated Fair Value 62,591us-gaap_AvailableForSaleSecurities 62,189us-gaap_AvailableForSaleSecurities
U.S. government agency obligations    
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale    
Amortized Cost 23,017us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
23,076us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
Gross Unrealized Gains 0czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
0czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
Gross Unrealized Losses 596czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
973czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
Estimated Fair Value 22,421us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
22,103us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
Obligations of states and political subdivisions    
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale    
Amortized Cost 10,671us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
11,432us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Gross Unrealized Gains 10czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
17czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Gross Unrealized Losses 236czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
255czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Estimated Fair Value 10,445us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
11,194us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Mortgage-backed securities    
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale    
Amortized Cost 29,584us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
29,058us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Gross Unrealized Gains 226czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
138czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Gross Unrealized Losses 143czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
369czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Estimated Fair Value 29,667us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
28,827us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Federal Agricultural Mortgage Corporation    
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale    
Amortized Cost 71us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_FairValueByAssetClassAxis
= czwi_FederalAgriculturalMortgageCorporationMember
71us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_FairValueByAssetClassAxis
= czwi_FederalAgriculturalMortgageCorporationMember
Gross Unrealized Gains 0czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= czwi_FederalAgriculturalMortgageCorporationMember
0czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= czwi_FederalAgriculturalMortgageCorporationMember
Gross Unrealized Losses 13czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= czwi_FederalAgriculturalMortgageCorporationMember
6czwi_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_FairValueByAssetClassAxis
= czwi_FederalAgriculturalMortgageCorporationMember
Estimated Fair Value $ 58us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= czwi_FederalAgriculturalMortgageCorporationMember
$ 65us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= czwi_FederalAgriculturalMortgageCorporationMember