CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parentheticals)	6 Months Ended
Jun. 30, 2012
Statement Of Stockholders Equity [Abstract]
Percentage of stock dividend on stock options and restricted stock	10.00%

Represents the percentage of stock dividend on stock options and restricted Stock.

No definition available.

Name:	sfst_PercentageOfStockDividendOnStockOptionsAndRestrictedStock
Namespace Prefix:	sfst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration