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Loans and Allowance for Loan Losses (Details 7) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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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

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- Definition Financing receivables equal to 30 to 89 days past due. + References No definition available. + Details
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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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