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Commitments and Contingencies (Narrative) (Details) (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Other Commitment 13,459,000us-gaap_OtherCommitment 15,027,000us-gaap_OtherCommitment
Commitments and Contingencies      
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
Fixed Income Interest Rate [Member]    
Other Commitment 892,700us-gaap_OtherCommitment
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
900,000us-gaap_OtherCommitment
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
Fixed Income Interest Rate [Member] | Maximum [Member]    
Commitments and Contingencies, Interest Rate 4.375%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
4.875%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
Fixed Income Interest Rate [Member] | Maximum [Member] | Commitments under homeowners' equity lending program [Member]    
Commitments and Contingencies, Interest Rate 7.625%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_FinancialInstrumentAxis
= cmsb_CommitmentsUnderHomeownersEquityLendingProgramMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
 
Fixed Income Interest Rate [Member] | Minimum [Member]    
Commitments and Contingencies, Interest Rate 4.25%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
3.75%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
Fixed Income Interest Rate [Member] | Minimum [Member] | Commitments under homeowners' equity lending program [Member]    
Commitments and Contingencies, Interest Rate 7.55%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_FinancialInstrumentAxis
= cmsb_CommitmentsUnderHomeownersEquityLendingProgramMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
 
Variable Income Interest Rate [Member]    
Other Commitment 1,863,000us-gaap_OtherCommitment
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_VariableIncomeInterestRateMember
2,950,000us-gaap_OtherCommitment
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_VariableIncomeInterestRateMember
Variable Income Interest Rate [Member] | Maximum [Member]    
Commitments and Contingencies, Interest Rate 4.75%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_VariableIncomeInterestRateMember
4.75%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_VariableIncomeInterestRateMember
Variable Income Interest Rate [Member] | Maximum [Member] | Commitments under homeowners' equity lending program [Member]    
Commitments and Contingencies, Interest Rate 5.25%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_FinancialInstrumentAxis
= cmsb_CommitmentsUnderHomeownersEquityLendingProgramMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_VariableIncomeInterestRateMember
 
Variable Income Interest Rate [Member] | Minimum [Member]    
Commitments and Contingencies, Interest Rate 4.25%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_VariableIncomeInterestRateMember
4.25%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_VariableIncomeInterestRateMember
Variable Income Interest Rate [Member] | Minimum [Member] | Commitments under homeowners' equity lending program [Member]    
Commitments and Contingencies, Interest Rate 2.00%cmsb_CommitmentsAndContingenciesInterestRate
/ us-gaap_FinancialInstrumentAxis
= cmsb_CommitmentsUnderHomeownersEquityLendingProgramMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_VariableIncomeInterestRateMember