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PENDING ACQUISITIONS (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
branch
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 14, 2018
$ / shares
Mar. 31, 2018
USD ($)
Business Acquisition [Line Items]          
Reported assets $ 11,656,275   $ 11,443,515   $ 8,022,828
Gross loans 8,482,339   8,511,914   $ 6,190,171
Deposits $ 9,800,875   9,649,313    
Fidelity Southern Corporation          
Business Acquisition [Line Items]          
Number of bank branches | branch 70        
Share price (in dollars per share) | $ / shares       $ 34.02  
Scenario, Forecast | Fidelity Southern Corporation          
Business Acquisition [Line Items]          
Number of stock for each share of Ameris common stock converted (in shares) | shares   0.80      
Consideration transferred   $ 750,700      
Georgia | Fidelity Southern Corporation          
Business Acquisition [Line Items]          
Number of bank branches | branch 51        
Florida | Fidelity Southern Corporation          
Business Acquisition [Line Items]          
Number of bank branches | branch 19        
Fidelity Southern Corporation          
Business Acquisition [Line Items]          
Reported assets     4,730,000    
Gross loans     3,920,000    
Deposits     $ 3,980,000