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BUSINESS COMBINATIONS - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 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 ($)
transaction
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 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     $ 50,011      
Cash exchanged for shares           0     21,421      
Goodwill           501,308 $ 503,434   208,513      
Other noninterest income           4,463     $ 3,580      
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 219,600         219,643            
Loans 1,300,000         1,298,040            
Loan discount $ 16,200                      
Loan discount, percent 1.23%                      
Purchased credit-impaired loans acquired $ 18,300                      
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   91,600       91,635            
Loans   755,700       $ 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