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Loans (Classes of the Loan Portfolio Summarized by the Aggregate Risk Level) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net $ 224,526us-gaap_NotesReceivableNet $ 208,919us-gaap_NotesReceivableNet
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 215,284us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
199,290us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 1,349us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
4,476us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 7,889us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
5,153us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 4us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
 
Real Estate: [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 184,125us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_RealEstatePortfolioMember
175,724us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_RealEstatePortfolioMember
Real Estate: [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 179,394us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_RealEstatePortfolioMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
170,689us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_RealEstatePortfolioMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Real Estate: [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 139us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_RealEstatePortfolioMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
755us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_RealEstatePortfolioMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Real Estate: [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 4,592us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_RealEstatePortfolioMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
4,280us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_RealEstatePortfolioMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
One-to-four-family [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 90,565us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
90,186us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
One-to-four-family [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 87,808us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
86,077us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
One-to-four-family [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 2,757us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
4,109us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Multi-family [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 28,658us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_ResidentialPortfolioSegmentMultiFamilyMember
25,773us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_ResidentialPortfolioSegmentMultiFamilyMember
Multi-family [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 28,658us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_ResidentialPortfolioSegmentMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
25,018us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_ResidentialPortfolioSegmentMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Multi-family [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net   755us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_ResidentialPortfolioSegmentMultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Non-residential [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 56,075us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
50,660us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Non-residential [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 54,337us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
50,660us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Non-residential [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 1,738us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
 
Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 174us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
935us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Construction [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 174us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
935us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Home equity and second mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 8,653us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_HomeEquityAndSecondMortgagesMember
8,170us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_HomeEquityAndSecondMortgagesMember
Home equity and second mortgages [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 8,417us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_HomeEquityAndSecondMortgagesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
7,999us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_HomeEquityAndSecondMortgagesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Home equity and second mortgages [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 139us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_HomeEquityAndSecondMortgagesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
 
Home equity and second mortgages [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 97us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_HomeEquityAndSecondMortgagesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
171us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cmsb_HomeEquityAndSecondMortgagesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 40,346us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
33,092us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial and Industrial [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 35,839us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
28,498us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial and Industrial [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 1,210us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
3,721us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial and Industrial [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 3,297us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
873us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 55us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
103us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Consumer [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 51us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
103us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Consumer [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net $ 4us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember