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Parent Company Financial Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets        
Cash and cash equivalents $ 92,165 $ 46,552    
Other assets 7,910 6,886    
Total assets 1,624,625 1,340,908    
Liabilities and Shareholders' Equity        
Junior subordinated debentures 13,403 13,403    
Shareholders' equity 149,686 109,872 $ 94,240 $ 82,992
Total liabilities and shareholders' equity 1,624,625 1,340,908    
Revenues        
Interest income 61,209 51,191 46,030  
Expenses        
Interest expense 10,333 8,192 7,501  
Income tax benefit 10,616 7,333 5,369  
Net income 13,045 13,036 10,167  
Operating activities        
Net income 13,045 13,036 10,167  
Adjustments to reconcile net income to net cash used for operating activities        
Compensation expense related to stock options and restricted stock grants 1,258 1,998 759  
(Increase) decrease in other assets (1,421) (1,867) (495)  
Financing activities        
Issuance of common stock 24,758      
Net increase (decrease) in cash and cash equivalents 45,613 (16,314) 21,602  
Cash and cash equivalents, beginning of year 46,552 62,866 41,264  
Cash and cash equivalents, end of year 92,165 46,552 62,866  
Southern First Bancshares, Inc. [Member]        
Assets        
Cash and cash equivalents 3,623 1,949    
Investment in subsidiaries 159,440 118,526    
Other assets 32 2,804    
Total assets 163,095 123,279    
Liabilities and Shareholders' Equity        
Accounts payable and accrued expenses 6 4    
Junior subordinated debentures 13,403 13,403    
Shareholders' equity 149,686 109,872    
Total liabilities and shareholders' equity 163,095 123,279    
Revenues        
Interest income 11 2 4  
Total revenue 11 2 4  
Expenses        
Interest expense 514 402 349  
Other expenses 246 243 829  
Total expenses 760 645 1,178  
Income tax benefit 262 172 212  
Loss before equity in undistributed net income of subsidiaries (487) (471) (962)  
Equity in undistributed net income of subsidiaries 13,532 13,507 11,129  
Net income 13,045 13,036 10,167  
Operating activities        
Net income 13,045 13,036 10,167  
Adjustments to reconcile net income to net cash used for operating activities        
Equity in undistributed net income of subsidiaries (13,532) (13,507) (11,129)  
Compensation expense related to stock options and restricted stock grants 1,258 1,998 759  
(Increase) decrease in other assets 2,772 (449) (192)  
Increase (decrease) in accounts payable and accrued expenses 2 (1)  
Net cash used for operating activities 3,545 1,077 (395)  
Investing activities        
Investment in subsidiaries, net (27,334) (668) (2,250)  
Net cash used for investing activities (27,334) (668) (2,250)  
Financing activities        
Issuance of common stock 24,758  
Proceeds from the exercise of stock options and warrants 705 1,098 628  
Net cash provided by financing activities 25,463 1,098 628  
Net increase (decrease) in cash and cash equivalents 1,674 1,507 (2,017)  
Cash and cash equivalents, beginning of year 1,949 442 2,459  
Cash and cash equivalents, end of year $ 3,623 $ 1,949 $ 442