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Fair Value Measurements (Additional Quantitative Information About Assets Measured at Fair Value on a Nonrecurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Impaired Loans [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value Disclosure, Nonrecurring $ 1,908us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= cmsb_ImpairedLoansMember
Other Real Estate Owned [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value Disclosure, Nonrecurring 183us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= cmsb_OtherRealEstateOwnedMember
(Level 3) Significant Unobservable Inputs [Member] | Impaired Loans [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value Disclosure, Nonrecurring 1,908us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= cmsb_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Valuation techniques Appraisals (1) [1]
Unobservable input Liquidation expenses (2) [1]
(Level 3) Significant Unobservable Inputs [Member] | Other Real Estate Owned [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value Disclosure, Nonrecurring $ 183us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= cmsb_OtherRealEstateOwnedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Valuation techniques Appraisals (1) [2]
Unobservable input Liquidation expenses (2) [2]
Fair Value Inputs, Discount Rate 6.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= cmsb_OtherRealEstateOwnedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Maximum [Member] | (Level 3) Significant Unobservable Inputs [Member] | Impaired Loans [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Discount Rate 5.67%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= cmsb_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Minimum [Member] | (Level 3) Significant Unobservable Inputs [Member] | Impaired Loans [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Discount Rate 4.02%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= cmsb_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Weighted Average [Member] | (Level 3) Significant Unobservable Inputs [Member] | Impaired Loans [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Discount Rate 4.84%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= cmsb_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Weighted Average [Member] | (Level 3) Significant Unobservable Inputs [Member] | Other Real Estate Owned [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Discount Rate 6.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= cmsb_OtherRealEstateOwnedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
[1] (Dollars in thousands)September 30, 2014Fair value estimateValuation techniquesUnobservable inputRangeWeighted averageImpaired loans$1,908Appraisals (1)Liquidation expenses (2)4.02% to 5.67%4.84%Other real estate owned183Appraisals (1)Liquidation expenses (2)6.00%6.00%Fair value is generally determined through discounted independent appraisals of the underlying collateral less any loan related liquidation expenses.
[2] Includes estimated liquidation expenses by borrower.