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Loans and Allowance for Loan Losses (Details 6) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due and Accruing $ 107csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue $ 1,666csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
Past Due 90 Days or More and Accruing 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Nonaccrual 1,450us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 2,865us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Total Past Due 1,557csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus 4,531csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
Current Loans 294,477us-gaap_FinancingReceivableRecordedInvestmentCurrent 290,833us-gaap_FinancingReceivableRecordedInvestmentCurrent
Total Loans 296,034us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 295,364us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due and Accruing 46csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
664csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
Past Due 90 Days or More and Accruing 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
Nonaccrual 500us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
496us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
Total Past Due 546csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
1,160csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
Current Loans 70,333us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
67,421us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
Total Loans 70,879us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
68,581us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate All Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due and Accruing 0csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
0csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
Past Due 90 Days or More and Accruing 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
Nonaccrual 455us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
Total Past Due 455csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
0csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
Current Loans 73,436us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
74,587us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
Total Loans 73,891us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
74,587us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
Consumer Real Estate Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due and Accruing 28csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
419csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Past Due 90 Days or More and Accruing 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Nonaccrual 264us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
1,134us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Total Past Due 292csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
1,553csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Current Loans 75,963us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
75,354us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Total Loans 76,255us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
76,907us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Construction and Land Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due and Accruing 0csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
521csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Past Due 90 Days or More and Accruing 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Nonaccrual 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
40us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Total Past Due 0csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
561csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Current Loans 35,376us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
33,888us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Total Loans 35,376us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
34,449us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due and Accruing 28csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
54csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Past Due 90 Days or More and Accruing 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Nonaccrual 231us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
1,195us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Total Past Due 259csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
1,249csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Current Loans 36,554us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
36,614us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Total Loans 36,813us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
37,863us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Consumer and Other Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due and Accruing 5csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
8csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Past Due 90 Days or More and Accruing 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Nonaccrual 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Total Past Due 5csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
8csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Current Loans 2,815us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
2,969us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Total Loans $ 2,820us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
$ 2,977us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember