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Loans and Allowance for Loan Losses (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount $ 296,034us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 295,364us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Commercial Real Estate Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 144,770us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
143,168us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
Consumer Real Estate Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 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 [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 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 [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 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 [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 2,820us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
2,977us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 282,749us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
277,201us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial Real Estate Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 139,054us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
135,586us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Consumer Real Estate Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 73,256us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
72,753us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Construction and Land Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 34,870us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
33,201us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 32,749us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
32,684us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Consumer and Other Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 2,820us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
2,820us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 8,046us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
7,752us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial Real Estate Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 3,118us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
3,096us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Consumer Real Estate Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 1,481us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
1,452us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Construction and Land Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
17us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 3,447us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
3,187us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Consumer and Other Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 5,239us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
10,411us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Commercial Real Estate Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 2,598us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
4,486us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Consumer Real Estate Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 1,518us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
2,702us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Construction and Land Development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 506us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
1,231us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount 617us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
1,992us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Consumer and Other Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount $ 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
$ 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember