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Loans and Allowance for Loan Losses (Details 3) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance, beginning of year $ 3,495,129us-gaap_LoansAndLeasesReceivableAllowance $ 3,203,000us-gaap_LoansAndLeasesReceivableAllowance $ 3,203,000us-gaap_LoansAndLeasesReceivableAllowance
Charged-off loans (237,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs   (1,582,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Recovery of charge-offs 49,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts   1,359,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Provision for (reallocation of) loan losses 350,000us-gaap_ProvisionForLoanAndLeaseLosses 165,000us-gaap_ProvisionForLoanAndLeaseLosses 515,000us-gaap_ProvisionForLoanAndLeaseLosses
Balance, end of year 3,656,545us-gaap_LoansAndLeasesReceivableAllowance   3,495,129us-gaap_LoansAndLeasesReceivableAllowance
Commercial Real Estate Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance, beginning of year 1,595,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
1,549,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
1,549,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
Charged-off loans (133,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
  (470,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
Recovery of charge-offs 13,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
  156,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
Provision for (reallocation of) loan losses 46,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
  360,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
Balance, end of year 1,521,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
  1,595,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember
Consumer Real Estate Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance, beginning of year 1,097,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
938,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
938,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Charged-off loans (37,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
  (896,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Recovery of charge-offs 13,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
  324,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Provision for (reallocation of) loan losses 81,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
  731,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Balance, end of year 1,154,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
  1,097,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerRealEstateMortgageMember
Construction and Land Development [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance, beginning of year 130,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
319,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
319,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Charged-off loans (10,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
  (58,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Recovery of charge-offs 4,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
  771,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Provision for (reallocation of) loan losses 112,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
  (902,000)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Balance, end of year 236,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
  130,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConstructionAndLandDevelopmentMember
Commercial and Industrial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance, beginning of year 638,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
352,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
352,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Charged-off loans (45,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
  (108,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Recovery of charge-offs 12,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
  58,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Provision for (reallocation of) loan losses 53,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
  336,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Balance, end of year 658,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
  638,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialAndIndustrialLoansMember
Consumer and Other Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance, beginning of year 35,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
45,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
45,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Charged-off loans (12,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
  (50,000)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Recovery of charge-offs 7,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
  50,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Provision for (reallocation of) loan losses 58,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
  (10,000)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
Balance, end of year $ 88,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember
  $ 35,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= csbq_ConsumerAndOtherLoansMember