REGULATORY CAPITAL REQUIREMENTS (Details 1)	Dec. 31, 2020	Dec. 31, 2019
CBLR	0.1072	0.1144
Bank [Member]
CBLR	0.1019	0.1123

The community bank leverage ratio as defined by regulatory framework.

No definition available.

Name:	bksc_CommunityBankLeverageRatio
Namespace Prefix:	bksc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant