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BUSINESS COMBINATIONS - Pro-forma information (Details) - Gulf Shore Banc shares Inc [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Net interest income $ 196,259 $ 170,363
Net income available to common shareholders $ 51,274 $ 41,594
EPS - basic (in dollars per share) $ 1.11 $ 0.97
EPS - diluted (in dollars per share) $ 1.09 $ 0.96