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PENDING ACQUISITIONS (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jan. 25, 2018
USD ($)
$ / shares
shares
Jan. 03, 2018
USD ($)
$ / shares
shares
Jan. 18, 2017
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
branch
$ / shares
shares
Jun. 30, 2018
USD ($)
branch
$ / shares
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nov. 16, 2017
$ / shares
Business Acquisition [Line Items]                  
Reported assets           $ 7,856,203 $ 6,892,031 $ 5,588,940  
Gross loans           6,046,355 5,264,326 3,908,923  
Deposits           1,777,141 1,573,389    
Other liabilities           50,334 34,064    
Issuance of common stock in acquisitions           0 $ 72,455 $ 0  
Atlantic Coast Financial Corporation                  
Business Acquisition [Line Items]                  
Share price (in dollars per share) | $ / shares                 $ 47.30
Scenario, Forecast | Hamilton State Bancshares, Inc.                  
Business Acquisition [Line Items]                  
Number of bank branches | branch       28          
Cash consideration distributed per share to shareholders of acquiree (USD per share) | $ / shares       $ 0.93          
Number of stock for each share of Ameris common stock converted | shares       0.16          
Consideration transferred       $ 405,700          
Scenario, Forecast | Atlantic Coast Financial Corporation                  
Business Acquisition [Line Items]                  
Number of bank branches | branch         12        
Cash consideration distributed per share to shareholders of acquiree (USD per share) | $ / shares         $ 1.39        
Number of stock for each share of Ameris common stock converted | shares         0.17        
Consideration transferred         $ 145,000        
Atlanta, Georgia MSA | Scenario, Forecast | Hamilton State Bancshares, Inc.                  
Business Acquisition [Line Items]                  
Number of bank branches | branch       24          
Gainesville, Georgia MSA | Scenario, Forecast | Hamilton State Bancshares, Inc.                  
Business Acquisition [Line Items]                  
Number of bank branches | branch       2          
Outside Of Atlanta, Georgia MSA | Scenario, Forecast | Hamilton State Bancshares, Inc.                  
Business Acquisition [Line Items]                  
Number of bank branches | branch       2          
Jacksonville, Florida MSA | Scenario, Forecast | Atlantic Coast Financial Corporation                  
Business Acquisition [Line Items]                  
Number of bank branches | branch         8        
Waycross, Georgia MSA | Scenario, Forecast | Atlantic Coast Financial Corporation                  
Business Acquisition [Line Items]                  
Number of bank branches | branch         3        
Douglas, Georgia MSA | Scenario, Forecast | Atlantic Coast Financial Corporation                  
Business Acquisition [Line Items]                  
Number of bank branches | branch         1        
US Premium Financing Holding Company                  
Business Acquisition [Line Items]                  
Cost method investment ownership percentage     4.99%            
Mr. Villari                  
Business Acquisition [Line Items]                  
Stock issued during period, shares, purchase of assets (in shares) | shares     128,572            
US Premium Financing Holding Company                  
Business Acquisition [Line Items]                  
Cost method investments     $ 5,800            
Price per share of the Company's common stock (in dollars per share) | $ / shares     $ 45.45            
Other liabilities           18,100      
Subsequent Event                  
Business Acquisition [Line Items]                  
Potential additional cash payments in a business combination $ 5,830                
Subsequent Event | Hamilton State Bancshares, Inc.                  
Business Acquisition [Line Items]                  
Share price (in dollars per share) | $ / shares $ 53.45                
Subsequent Event | US Premium Financing Holding Company                  
Business Acquisition [Line Items]                  
Consideration transferred $ 8,920                
Share price (in dollars per share) | $ / shares $ 53.55                
Purchase of remaining ownership interest in cost method investment 70.00%                
Cash paid to acquire a business $ 8,920                
Common shares issued in a business combination (in shares) | shares 830,301                
Issuance of common stock in acquisitions $ 44,500                
Subsequent Event | US Premium Financing Holding Company                  
Business Acquisition [Line Items]                  
Cost method investment ownership percentage 70.00% 25.01%              
Subsequent Event | Mr. Villari                  
Business Acquisition [Line Items]                  
Stock issued during period, shares, purchase of assets (in shares) | shares   114,285              
Cash paid for purchase of shares of common stock   $ 12,500              
Subsequent Event | US Premium Financing Holding Company                  
Business Acquisition [Line Items]                  
Cost method investments   $ 18,100              
Hamilton State Bancshares, Inc.                  
Business Acquisition [Line Items]                  
Reported assets           1,790,000      
Gross loans           1,300,000      
Deposits           1,550,000      
Atlantic Coast Financial Corporation                  
Business Acquisition [Line Items]                  
Reported assets           983,300      
Gross loans           851,400      
Deposits           $ 675,800      
US Premium Financing Holding Company                  
Business Acquisition [Line Items]                  
Price per share of the Company's common stock (in dollars per share) | $ / shares     $ 45.45            
US Premium Financing Holding Company | Subsequent Event                  
Business Acquisition [Line Items]                  
Price per share of the Company's common stock (in dollars per share) | $ / shares   $ 48.75