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Stock Option Plans (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock or Unit Option Plan Expense | $ 160,500us-gaap_StockOptionPlanExpense | $ 129,056us-gaap_StockOptionPlanExpense | $ 74,048us-gaap_StockOptionPlanExpense
Officer and Employee Plans [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | 281,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / csbq_TypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember | 190,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / csbq_TypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember | 73,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / csbq_TypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember
Percentage Of Incentive Stock Options Vest On Fourth Anniversary Of Grant Date | 40.00%csbq_PercentageOfIncentiveStockOptionsVestOnFourthAnniversaryOfGrantDate / csbq_TypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | 658,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / csbq_TypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember |  |
Percentage Of Incentive Stock Options Vest On Second And Third Anniversary Of Grant Date | 30.00%csbq_PercentageOfIncentiveStockOptionsVestOnSecondAndThirdAnniversaryOfGrantDate / csbq_TypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |
Exercise Price Incentive Stock Option Description | 0 |  |
Officer and Employee Plans [Member] | Long Term Incentive Plan 2002 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares Held in Employee Stock Option Plan, Allocated | 220,000us-gaap_SharesHeldInEmployeeStockOptionPlanAllocated / csbq_PlansNameAxis = csbq_LongTermIncentivePlan2002Member / csbq_TypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember |  |
Officer and Employee Plans [Member] | Cornerstone Statutory Option Plan 1996 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares Held in Employee Stock Option Plan, Allocated | 1,200,000us-gaap_SharesHeldInEmployeeStockOptionPlanAllocated / csbq_PlansNameAxis = csbq_CornerstoneStatutoryOptionPlan1996Member / csbq_TypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember |  |
Board Of Directors Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | 179,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / csbq_TypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember | 102,600us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / csbq_TypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 130,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / csbq_TypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / csbq_TypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember |  |
Board Of Directors Plan [Member] | Long Term Incentive Plan 2002 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares Held in Employee Stock Option Plan, Allocated | 1,200,000us-gaap_SharesHeldInEmployeeStockOptionPlanAllocated / csbq_PlansNameAxis = csbq_LongTermIncentivePlan2002Member / csbq_TypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember |  |
Percentage Of Board Of Directors Plan Vest On First Anniversary Of Grant Date | 50.00%csbq_PercentageOfBoardOfDirectorsPlanVestOnFirstAnniversaryOfGrantDate / csbq_PlansNameAxis = csbq_LongTermIncentivePlan2002Member / csbq_TypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember | 50.00%csbq_PercentageOfBoardOfDirectorsPlanVestOnFirstAnniversaryOfGrantDate / csbq_PlansNameAxis = csbq_LongTermIncentivePlan2002Member / csbq_TypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember | 50.00%csbq_PercentageOfBoardOfDirectorsPlanVestOnFirstAnniversaryOfGrantDate / csbq_PlansNameAxis = csbq_LongTermIncentivePlan2002Member / csbq_TypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember
Percentage Of Board Of Directors Plan Vest On Second Anniversary Of Grant Date | 50.00%csbq_PercentageOfBoardOfDirectorsPlanVestOnSecondAnniversaryOfGrantDate / csbq_PlansNameAxis = csbq_LongTermIncentivePlan2002Member / csbq_TypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember | 50.00%csbq_PercentageOfBoardOfDirectorsPlanVestOnSecondAnniversaryOfGrantDate / csbq_PlansNameAxis = csbq_LongTermIncentivePlan2002Member / csbq_TypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember | 50.00%csbq_PercentageOfBoardOfDirectorsPlanVestOnSecondAnniversaryOfGrantDate / csbq_PlansNameAxis = csbq_LongTermIncentivePlan2002Member / csbq_TypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember

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- Definition Represents description of exercise price for incentive stock options. + References No definition available. + Details
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- Definition Percentage of board of director plan vested on first anniversary. + References No definition available. + Details
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- Definition Percentage of board of directors plan vested on second anniversary. + References No definition available. + Details
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- Definition Percentage of fourth anniversary of grant date. + References No definition available. + Details
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- Definition Percentage of incentive of second and third anniversary of grant date. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of allocated shares held by the Employee Stock Option Plan at balance sheet date. Allocated shares are shares that have been assigned to individual participant accounts based on a known formula. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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