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Loans and Allowance for Loan Losses (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Modifications [Line Items]      
Description Of Bank's Loan Grading Process The Banks loan grading process is as follows: All loans are assigned a loan grade at the time of origination by the relationship manager. Typically, a loan is assigned a loan grade of pass at origination. Loans relationships greater than or equal to $500 thousand are reviewed by the Banks external loan review provider on an annual basis. Additionally, the Bank's external loan review provider samples other loan relationships between $100 thousand and $500 thousand with an emphasis on commercial and commercial real estate loans and insider loans. The Banks internal loan review department samples approximately 33percent of all loan relationships less than $500 thousand on an annual basis for review. If a loan is delinquent 60 days or more or a pattern of delinquency exists, the loan will be selected for review. Generally, all loans on the Banks internal watchlist are reviewed annually by internal loan review or external loan review providers.    
Financing Receivable, Modifications, Recorded Investment $ 4,956,000us-gaap_FinancingReceivableModificationsRecordedInvestment $ 5,753,000us-gaap_FinancingReceivableModificationsRecordedInvestment  
Commercial Real Estate Mortgage [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modifications, Recorded Investment $ 902,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember		 $ 2,073,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember		 $ 5,971,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= csbq_CommercialRealEstateMortgageMember