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Loans - Schedule of Aging of Past Due and Nonaccrual Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 405,220us-gaap_FinancingReceivableRecordedInvestmentCurrent $ 374,096us-gaap_FinancingReceivableRecordedInvestmentCurrent
30 - 59 Days Past Due 1,033us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue 865us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
60 - 89 Days Past Due 349us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue 651us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
90 Days + Past Due 281us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue 1,036us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Nonaccrual 3,668us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 2,234us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Total Past Due and Nonaccrual 5,331csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus 4,786csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
Total ending loans balance 410,551us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 378,882us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Construction & Land Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 17,431us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
12,494us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
60 - 89 Days Past Due 15us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
 
90 Days + Past Due   950us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
Total Past Due and Nonaccrual 15csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
950csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
Total ending loans balance 17,446us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
13,444us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 122,283us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
117,342us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
30 - 59 Days Past Due 362us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
15us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
60 - 89 Days Past Due 96us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
37us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
90 Days + Past Due 1us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
 
Nonaccrual 1,071us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
84us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Total Past Due and Nonaccrual 1,530csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
136csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Total ending loans balance 123,813us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
117,478us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 137,683us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
128,462us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
30 - 59 Days Past Due 174us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
111us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
60 - 89 Days Past Due 104us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
107us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
90 Days + Past Due   40us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
Nonaccrual 1,734us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
1,108us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
Total Past Due and Nonaccrual 2,012csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
1,366csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
Total ending loans balance 139,695us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
129,828us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbb_CommercialRealEstateLoanMember
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 120,025us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
109,274us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
30 - 59 Days Past Due 424us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
616us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
60 - 89 Days Past Due 92us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
467us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
90 Days + Past Due 280us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
46us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
Nonaccrual 863us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
1,042us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
Total Past Due and Nonaccrual 1,659csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
2,171csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
Total ending loans balance 121,684us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
111,445us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbb_ResidentialRealEstateLoanMember
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 7,798us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
6,524us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
30 - 59 Days Past Due 73us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
123us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
60 - 89 Days Past Due 42us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
40us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Total Past Due and Nonaccrual 115csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
163csbb_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Total ending loans balance $ 7,913us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ 6,687us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember