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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Line Items]      
Goodwill net additions recorded $ 428,200,000    
Subsequent fair value adjustments (2,294,000) $ 0  
Carrying value of intangible assets 91,586,000 58,700,000  
Amortization of intangible assets 17,713,000 $ 9,512,000 $ 3,932,000
Fidelity Southern Corporation      
Goodwill [Line Items]      
Goodwill net additions recorded 430,500,000    
Hamilton State Bancshares, Inc.      
Goodwill [Line Items]      
Subsequent fair value adjustments 1,100,000    
Atlantic Coast Financial Corporation      
Goodwill [Line Items]      
Subsequent fair value adjustments (2,600,000)    
US Premium Financing Holding Company      
Goodwill [Line Items]      
Subsequent fair value adjustments $ (792,000)    
Core deposit premiums | Minimum      
Goodwill [Line Items]      
Acquired finite-lived intangible assets, weighted average useful life 7 years 7 years  
Core deposit premiums | Maximum      
Goodwill [Line Items]      
Acquired finite-lived intangible assets, weighted average useful life 10 years 10 years  
Core deposit premiums | Fidelity Southern Corporation      
Goodwill [Line Items]      
Acquired finite-lived intangible assets $ 50,600,000    
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 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 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 3 years  
Banking Division      
Goodwill [Line Items]      
Subsequent fair value adjustments $ (1,502,000) $ 0  
Goodwill impairment 0    
Premium Finance Division      
Goodwill [Line Items]      
Subsequent fair value adjustments (792,000) $ 0  
Goodwill impairment $ 0