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STOCK INCENTIVE PLAN AND EMPLOYEE STOCK OWNERSHIP PLAN AND TRUST (Details 2) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Weighted Average Grant-Date Fair Value Outstanding Shares 143,885us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares 148,440us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
Weighted Average Grant-Date Fair Value $ 3.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Award Year 2006 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 13,915us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear2006Member
 
Weighted Average Grant-Date Fair Value $ 4.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear2006Member
 
Award Year 2007 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 5,500us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear2007Member
 
Weighted Average Grant-Date Fair Value $ 4.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear2007Member
 
Award Year 2007 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 3,300us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear20071Member
 
Weighted Average Grant-Date Fair Value $ 4.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear20071Member
 
Award Year 2008 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 2,200us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear2008Member
 
Weighted Average Grant-Date Fair Value $ 3.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear2008Member
 
Award Year 2010 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 16,250us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear2010Member
 
Weighted Average Grant-Date Fair Value $ 6.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear2010Member
 
Award Year 2011 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 5,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear2011Member
 
Weighted Average Grant-Date Fair Value $ 4.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear2011Member
 
Award Year 2011 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 91,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear20111Member
 
Weighted Average Grant-Date Fair Value $ 4.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear20111Member
 
Award Year 2012 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 8,250us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear2012Member
 
Weighted Average Grant-Date Fair Value $ 2.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear2012Member
 
Award Year 2012 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 2,500us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear20121Member
 
Weighted Average Grant-Date Fair Value $ 2.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear20121Member
 
Award Year 2013 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 1,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear2013Member
 
Weighted Average Grant-Date Fair Value $ 3.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear2013Member
 
Award Year 2013 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 2,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear20131Member
 
Weighted Average Grant-Date Fair Value $ 4.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear20131Member
 
Award Year 2014 [Member]    
Weighted Average Grant-Date Fair Value Outstanding Shares 9,250us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardDateAxis
= bksc_AwardYear2014Member
 
Weighted Average Grant-Date Fair Value $ 3.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= bksc_AwardYear2014Member