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Loans and Allowance for Loan Losses (Details 7) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due and Accruing $ 1,666csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue $ 2,250csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
Past Due 90 Days or More and Accruing 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Nonaccrual 2,865us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 3,566us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Total Past Due 4,531csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus 5,816csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
Current Loans 290,833us-gaap_FinancingReceivableRecordedInvestmentCurrent 283,624us-gaap_FinancingReceivableRecordedInvestmentCurrent
Total Loans 295,364us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 289,440us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due and Accruing 664csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
678csbq_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 496us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
838us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
Total Past Due 1,160csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
1,516csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
Current Loans 67,421us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
64,231us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
Total Loans 68,581us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateOwnerOccupiedMember
65,747us-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
867csbq_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 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
44us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
Total Past Due 0csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
911csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
Current Loans 74,587us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
63,141us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
Total Loans 74,587us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateAllOtherMember
64,052us-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 419csbq_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 1,134us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
1,006us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Total Past Due 1,553csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
1,425csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Current Loans 75,354us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
74,890us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Total Loans 76,907us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
76,315us-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 521csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
50csbq_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 40us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
47us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Total Past Due 561csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
97csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Current Loans 33,888us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
41,500us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Total Loans 34,449us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
41,597us-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 54csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
201csbq_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 1,195us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
1,631us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Total Past Due 1,249csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
1,832csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Current Loans 36,614us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
37,167us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Total Loans 37,863us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
38,999us-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 8csbq_FinancingReceivableRecordedInvestments30To89DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
35csbq_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 8csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
35csbq_FinancingReceivableRecordedInvestmentPastDueIncludingNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Current Loans 2,969us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
2,695us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Total Loans $ 2,977us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
$ 2,730us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember