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Stock Based Compensation (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock or Unit Option Plan Expense	$ 66,000us-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, Number of Shares Authorized	1,420,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember
Share based Compensation Arrangement By Share based Payment Award Options Grants Date Maximum Term	10 years
Exercise Price Incentive Stock Option Description	The exercise price for incentive stock options must be not less than 100 percent of the fair market value of the common stock on the date of the grant
Percentage Of Incentive Stock Options Vest On Second Anniversary Of Grant Date	30.00%csbq_PercentageOfIncentiveStockOptionsVestOnSecondAnniversaryOfGrantDate / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember
Percentage Of Incentive Stock Options Vest On Third Anniversary Of Grant Date	60.00%csbq_PercentageOfIncentiveStockOptionsVestOnThirdAnniversaryOfGrantDate / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember
Percentage Of Incentive Stock Options Vest On Fourth Anniversary Of Grant Date	100.00%csbq_PercentageOfIncentiveStockOptionsVestOnFourthAnniversaryOfGrantDate / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember
Percentage Of Nonqualified Stock Options Vest On First Anniversary Of Grant Date	50.00%csbq_PercentageOfNonqualifiedStockOptionsVestOnFirstAnniversaryOfGrantDate / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember
Percentage Of Nonqualified Stock Options Vest On Second Anniversary Of Grant Date	100.00%csbq_PercentageOfNonqualifiedStockOptionsVestOnSecondAnniversaryOfGrantDate / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = csbq_OfficerAndEmployeePlansMember
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	612,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = 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, Number of Shares Authorized	600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember
Percentage Of Nonqualified Stock Options Vest On First Anniversary Of Grant Date	50.00%csbq_PercentageOfNonqualifiedStockOptionsVestOnFirstAnniversaryOfGrantDate / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember
Percentage Of Nonqualified Stock Options Vest On Second Anniversary Of Grant Date	50.00%csbq_PercentageOfNonqualifiedStockOptionsVestOnSecondAnniversaryOfGrantDate / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 111,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember
Board Of Directors Plan [Member] | Long Term Incentive Plan 2002 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = csbq_BoardOfDirectorsPlanMember / us-gaap_PlanNameAxis = csbq_LongTermIncentivePlan2002Member

X

- Definition

Represents description of exercise price for incentive stock options.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of fourth anniversary of grant date.

+ References

No definition available.

+ Details

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- Definition

Percentage of incentive stock options vested on second anniversary of grant date.

+ References

No definition available.

+ Details

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- Definition

Percentage of incentive of third anniversary of grant date.

+ References

No definition available.

+ Details

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- Definition

Percentage of non qualified stock options vested on first anniversary of grant date.

+ References

No definition available.

+ Details

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- Definition

Percentage of non qualified stock options vested on second anniversaries of grant date.

+ References

No definition available.

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X

- Definition

Share-based compensation arrangement by share-based payment award, options, grants date maximum term during the period.

+ References

No definition available.

+ Details

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X

- 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

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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

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X

- 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

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