REGULATORY CAPITAL REQUIREMENTS (Details Narrative)	Dec. 31, 2017	Dec. 31, 2015
Regulatory Capital Requirements [Abstract]
Common equity tier 1 capital conservation buffer (risk-weighted assets)	1.25%	2.50%

Capital conservation buffer ratio that must be computed to determine captail requirements under regualtions.

No definition available.

Name:	bksc_CommonEquityTier1CapitalConservationBufferRiskWeightedAssets
Namespace Prefix:	bksc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant