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BUSINESS COMBINATIONS - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 29, 2018
USD ($)
branch
$ / shares
shares
May 25, 2018
USD ($)
branch
$ / shares
shares
Jan. 31, 2018
USD ($)
shares
Jan. 03, 2018
USD ($)
Jan. 31, 2018
USD ($)
transaction
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jan. 31, 2018
USD ($)
shares
Jan. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 18, 2017
Business Acquisition [Line Items]                          
Issuance of common stock in acquisitions               $ 547,127 $ 0        
Goodwill           $ 505,604 $ 125,532 505,604 125,532     $ 125,532  
Liability for USPF acquisition contingent consideration           2,514   2,514          
Other noninterest income           3,243 $ 2,425 12,053 $ 8,508        
US Premium Financing Holding Company                          
Business Acquisition [Line Items]                          
Ownership percentage                     30.00%    
Cost method investment                     $ 23,900    
Hamilton State Bancshares, Inc.                          
Business Acquisition [Line Items]                          
Number of bank branches | branch 28                        
Number of stock for each share of Ameris common stock converted (in shares) | shares 0.16                        
Cash consideration distributed per share to shareholders of acquiree (USD per share) | $ / shares $ 0.93                        
Ameris Bancorp common shares issued (in shares) | shares 6,548,385                        
Issuance of common stock in acquisitions $ 349,400                        
Cash exchanged for shares 47,779                        
Goodwill 221,300         221,277   221,277          
Loans 1,300,000         1,298,736   1,298,736          
Loan discount $ 15,500                        
Loan discount, percent 1.18%                        
Consideration transferred $ 397,135                        
Purchased credit-impaired loans acquired $ 18,800                        
Atlantic Coast Financial Corporation                          
Business Acquisition [Line Items]                          
Number of bank branches | branch   12                      
Number of stock for each share of Ameris common stock converted (in shares) | shares   0.17                      
Cash consideration distributed per share to shareholders of acquiree (USD per share) | $ / shares   $ 1.39                      
Ameris Bancorp common shares issued (in shares) | shares   2,631,520                      
Issuance of common stock in acquisitions   $ 147,800                      
Cash exchanged for shares   21,527                      
Goodwill   93,300       93,338   93,338          
Loans   755,700       755,704   $ 755,704          
Loan discount   $ 21,900                      
Loan discount, percent   2.82%                      
Consideration transferred   $ 169,287                      
Purchased credit-impaired loans acquired   $ 10,800                      
US Premium Financing Holding Company                          
Business Acquisition [Line Items]                          
Ameris Bancorp common shares issued (in shares) | shares     830,301   1,073,158         1,073,158      
Issuance of common stock in acquisitions         $ 55,900         $ 55,855      
Cash exchanged for shares         21,400         21,421      
Goodwill     $ 65,457   $ 65,457         $ 65,457      
Percentage of voting interests acquired     70.00% 25.01% 70.00%         70.00%     4.99%
Number of acquisition transactions | transaction         3                
Contingent consideration, maximum     $ 5,800   $ 5,800         $ 5,800      
Liability for USPF acquisition contingent consideration     5,700   $ 5,700         5,700      
Consideration transferred     $ 8,900 $ 12,500           $ 82,981      
Other noninterest income           $ 2,000