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STOCK INCENTIVE PLAN AND EMPLOYEE STOCK OWNERSHIP PLAN AND TRUST (Details Narrative) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 1998
Jul. 24, 2014
N
Dec. 19, 2013
N
Jun. 27, 2013
N
Sep. 24, 2012
N
Jun. 28, 2012
N
Apr. 13, 2010
Percent of options vesting in five years 20.00%bksc_PercentOfOptionsVestingInFiveYears                  
Percentage of options vesting each following year 20.00%bksc_PercentageOfOptionsVestingEachFollowingYear                  
Options granted 10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 7,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 11,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod              
Number of options purchase exercisable 16,280us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber                  
Intrinsic value of options exercised $ 12,775us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 43,156us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 2,845us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue              
Stock-based compensation expense 74,908us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 74,722us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 72,928us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue              
Unrecognized compensation cost 437,452us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized                  
Period for unrecognized compensation cost to be recognized 5 years 11 months 23 days                  
Employee Stock Ownership Plan (ESOP) expense recognized $ 280,000us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense $ 285,000us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense                
1998 Stock Incentive Plan [Member]                    
Number of share authorized under stock incentive plan       180,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= bksc_OmnibusStockIncentivePlanMember
           
Number of adjusted shares authorized       299,475bksc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized1
/ us-gaap_PlanNameAxis
= bksc_OmnibusStockIncentivePlanMember
           
Stock Incentive Plan Adjustment      

Adjusted for two 10% stock dividends, a 10% stock distribution, and a 25% stock dividend

           
Number of options purchase 24,915us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
/ us-gaap_PlanNameAxis
= bksc_OmnibusStockIncentivePlanMember
                 
Number of options purchase exercisable 16,280us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_PlanNameAxis
= bksc_OmnibusStockIncentivePlanMember
                 
2010 Stock Incentive Plan [Member]                    
Number of share authorized under stock incentive plan                   300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= bksc_OmnibusStockIncentivePlan1Member
Stock Options [Member]                    
Options granted         10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
2,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
2,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
9,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Number of employees to whom options were granted         12bksc_NumberOfEmployeesToWhomOptionsWereGranted
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
3bksc_NumberOfEmployeesToWhomOptionsWereGranted
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
5bksc_NumberOfEmployeesToWhomOptionsWereGranted
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
1bksc_NumberOfEmployeesToWhomOptionsWereGranted
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
5bksc_NumberOfEmployeesToWhomOptionsWereGranted
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Option pricing model used         Black-Scholes Black-Scholes Black-Scholes Black-Scholes Black-Scholes  
Dividend Yield         3.74%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
3.98%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
3.98%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
3.97%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
3.97%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Historical Volatility         31.69%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
36.34%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
36.34%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
33.94%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
33.94%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Risk free interest rate         2.52%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
2.94%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
2.49%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
1.74%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
1.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Expected life         10 years 10 years 10 years 10 years 10 years