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BUSINESS COMBINATIONS - Additional Information - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 30, 2019
Apr. 01, 2018
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]            
Business Combination, Consideration Transferred   $ 1,059,504        
Cash consideration $ 53,700 43        
Stock consideration 60,900 1,043,424        
Total assets acquired 74,900 4,402,804        
Total liabilities assumed 18,400 4,018,943   $ 18,380 $ 4,018,948 $ 0
Goodwill 58,000 675,643 $ 58,000 57,520 676,167 $ 0
Payments for Merger Related Costs       $ 3,200 $ 37,800  
Loans   2,792,572        
Business Combination, Acquired Receivables, Gross Contractual Amount   2,900,000        
Bannockburn [Member]            
Business Acquisition [Line Items]            
Business Combination, Consideration Transferred $ 114,600          
MainSource [Member]            
Business Acquisition [Line Items]            
Business Combination, Consideration Transferred   $ 1,100,000        
Business Acquisition, Number Of Shares Received by Acquiree   1.3875