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Benefit Plans (Schedule of Expected Benefit Payments) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Benefit Plans [Abstract]  
2015 $ 226us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
2016 222us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
2017 226us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
2018 272us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
2019 338us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
2020 to 2024 1,678us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
Defined Benefit Plan, Total Expected Future Benefit Payments $ 2,962cmsb_DefinedBenefitPlanTotalExpectedFutureBenefitPayments