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PENDING ACQUISITIONS - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 30, 2019
USD ($)
branch
shares
Dec. 31, 2018
USD ($)
Dec. 14, 2018
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]          
Reported assets   $ 11,443,515   $ 7,856,203 $ 6,892,031
Gross loans   8,511,914   6,046,355 $ 5,264,326
Deposits   2,520,016   $ 1,777,141  
Fidelity Southern Corporation          
Business Acquisition [Line Items]          
Share price (in dollars per share) | $ / shares     $ 34.02    
Scenario, Forecast | Fidelity Southern Corporation          
Business Acquisition [Line Items]          
Number of bank branches | branch 69        
Number of stock for each share of Ameris common stock converted (in shares) | shares 0.80        
Consideration transferred $ 750,700        
Georgia | Scenario, Forecast | Fidelity Southern Corporation          
Business Acquisition [Line Items]          
Number of bank branches | branch 50        
Florida | Scenario, Forecast | 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