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Employee Benefits - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Profit sharing contribution 2.75%csbb_PercentageProfitSharingContributionOfEligibleParticipantsCompensation 2.75%csbb_PercentageProfitSharingContributionOfEligibleParticipantsCompensation 2.50%csbb_PercentageProfitSharingContributionOfEligibleParticipantsCompensation
Company match of participant contributions 50.00%csbb_PercentageMaximumEmployersContributionOnParticipantsContributionUnderProfitSharingPlan    
Maximum annual compensation contribution 2.00%csbb_PercentageOfMatchingContributionUnderCompensationPlan    
Expense under plan $ 269csbb_FourZeroOneKProfitSharingPlanExpense $ 284csbb_FourZeroOneKProfitSharingPlanExpense $ 270csbb_FourZeroOneKProfitSharingPlanExpense
Stock options granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Total intrinsic value of stock options and outstanding 48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue 34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue  
Total intrinsic value of exercisable stock options $ 48us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 $ 34us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1  
Stock options vested 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber