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BUSINESS COMBINATIONS - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 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 ($)
transaction
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jan. 31, 2018
USD ($)
shares
Jan. 30, 2018
USD ($)
Jan. 18, 2017
Business Acquisition [Line Items]                          
Issuance of common stock in acquisitions                 $ 0 $ 547,127      
Goodwill           $ 501,140 $ 503,434 $ 504,764 501,140 504,764      
Other noninterest income           3,683   4,717 7,297 $ 7,911      
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 220,800         220,768     220,768        
Loans 1,290,000         1,293,186     1,293,186        
Loan discount $ 21,100                        
Loan discount, percent 1.60%                        
Purchased credit-impaired loans acquired $ 15,400                        
Consideration transferred $ 397,135                        
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   90,300       90,342     90,342        
Loans   755,700       $ 755,704     $ 755,704        
Loan discount   $ 21,900                      
Loan discount, percent   2.82%                      
Purchased credit-impaired loans acquired   $ 10,800                      
Consideration transferred   $ 169,287                      
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     $ 64,498   $ 64,498           $ 64,498    
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             $ 2,500 $ 2,000