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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]      
Goodwill recorded $ 377,902,000 $ 0  
Carrying value of intangible assets 58,689,000 13,500,000  
Loans 5,660,457,000 4,856,514,000  
Amortization of intangible assets 9,512,000 3,932,000 $ 4,376,000
Hamilton State Bancshares, Inc.      
Goodwill [Line Items]      
Goodwill recorded 219,600,000    
Atlantic Coast Financial Corporation      
Goodwill [Line Items]      
Goodwill recorded 93,000,000    
US Premium Financing Holding Company      
Goodwill [Line Items]      
Goodwill recorded $ 65,300,000    
Core deposit premiums | Minimum      
Goodwill [Line Items]      
Acquired finite-lived intangible assets, weighted average useful life 7 years    
Core deposit premiums | Maximum      
Goodwill [Line Items]      
Acquired finite-lived intangible assets, weighted average useful life 10 years    
Core deposit premiums | Hamilton State Bancshares, Inc.      
Goodwill [Line Items]      
Acquired finite-lived intangible assets $ 23,600,000    
Core deposit premiums | Atlantic Coast Financial Corporation      
Goodwill [Line Items]      
Acquired finite-lived intangible assets 7,500,000    
Insurance agent relationships | US Premium Financing Holding Company      
Goodwill [Line Items]      
Acquired finite-lived intangible assets $ 22,400,000    
Acquired finite-lived intangible assets, weighted average useful life 8 years    
US Premium Finance trade name | US Premium Financing Holding Company      
Goodwill [Line Items]      
Acquired finite-lived intangible assets $ 1,100,000    
Acquired finite-lived intangible assets, weighted average useful life 7 years    
Non-compete agreement | US Premium Financing Holding Company      
Goodwill [Line Items]      
Acquired finite-lived intangible assets $ 162,000    
Acquired finite-lived intangible assets, weighted average useful life 3 years    
Banking Division      
Goodwill [Line Items]      
Goodwill recorded $ 312,612,000 0  
Goodwill, Impairment Loss 0    
Premium Finance Division      
Goodwill [Line Items]      
Goodwill recorded 65,290,000 0  
Goodwill, Impairment Loss 0    
Decrease in loans (72,200,000)    
Loans $ 410,400,000 $ 482,500,000