XML 26 R79.htm IDEA: XBRL DOCUMENT v2.4.1.9
Benefit Plans (Schedule of Plan Assets) (Details)
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Actual Plan Asset Allocations 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Separate account- Prudential Large Cap Blend/Victory Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Actual Plan Asset Allocations 52.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cmsb_SeparateAccountPrudentialLargeCapBlendVictoryFundMember		 51.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cmsb_SeparateAccountPrudentialLargeCapBlendVictoryFundMember
Guaranteed investment contract [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Actual Plan Asset Allocations 48.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cmsb_GuaranteedInvestmentContractMember		 49.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cmsb_GuaranteedInvestmentContractMember