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Commitments and Contingencies (Schedule of Outstanding Commitments) (Details) (USD $)
Sep. 30, 2014
Sep. 30, 2013
Other Commitment $ 13,459,000us-gaap_OtherCommitment $ 15,027,000us-gaap_OtherCommitment
Commitments to originate loans, expiring in three months or less [Member]    
Other Commitment 2,756,000us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanOriginationCommitmentsMember		 3,850,000us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanOriginationCommitmentsMember
Commitments under homeowners' equity lending program [Member]    
Other Commitment 6,721,000us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= cmsb_CommitmentsUnderHomeownersEquityLendingProgramMember		 6,619,000us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= cmsb_CommitmentsUnderHomeownersEquityLendingProgramMember
Commitments under overdraft protection and commercial lines of credit [Member]    
Other Commitment $ 3,982,000us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 $ 4,558,000us-gaap_OtherCommitment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember