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BUSINESS COMBINATIONS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 30, 2019
Apr. 01, 2018
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]            
Cash consideration $ 53,700 $ 43        
Stock consideration 60,900 1,043,424        
Warrant consideration   14,460        
Options consideration   1,577        
Total purchase consideration   1,059,504        
Cash   71,806        
Investment securities available-for-sale   900,935        
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Held to Maturity Securities   171,423        
Other investments   28,763        
Loans   2,792,572        
Premises and equipment   98,814        
Intangible assets   42,887        
Other assets   167,829        
Assets held for sale   127,775        
Total assets acquired 74,900 4,402,804        
Deposits   3,263,920        
Subordinated notes   49,027        
FHLB advances   291,887        
Other borrowings   205,620        
Other liabilities   32,649        
Liabilities held for sale   175,840        
Total liabilities assumed 18,300 4,018,943 $ 18,298 $ 18,298 $ 4,018,948  
Net identifiable assets   383,861        
Goodwill $ 58,000 $ 675,643 $ 58,000 $ 57,438 $ 676,949 $ 676,167