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SUBSEQUENT EVENT (Details)
$ in Thousands
6 Months Ended
Jul. 01, 2019
USD ($)
branch
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]        
Company common stock issued   $ 0 $ 547,127  
Reported assets   11,889,336 11,190,697 $ 11,443,515
Gross loans   9,049,870 $ 8,490,534 8,511,914
Deposits   9,582,370   $ 9,649,313
Fidelity Southern Corporation        
Business Acquisition [Line Items]        
Merger and conversion charges from acquisitions   4,300    
Fidelity Southern Corporation        
Business Acquisition [Line Items]        
Reported assets   4,780,000    
Gross loans   3,920,000    
Deposits   $ 4,040,000    
Subsequent Event | Fidelity Southern Corporation        
Business Acquisition [Line Items]        
Number of bank branches | branch 62      
Number of stock for each share of Ameris common stock converted (in shares) | shares 0.80      
Shares issued (in shares) | shares 22,200,000      
Company common stock issued $ 869,300      
Subsequent Event | Georgia | Fidelity Southern Corporation        
Business Acquisition [Line Items]        
Number of bank branches | branch 46      
Subsequent Event | Florida | Fidelity Southern Corporation        
Business Acquisition [Line Items]        
Number of bank branches | branch 16