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BUSINESS COMBINATION BUSINESS COMBINATIONS (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Aug. 30, 2019
Apr. 01, 2018
Sep. 30, 2019
Jun. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
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          
Investment securities held-to-maturity   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 18,400 4,018,943     $ 0 $ 18,380 $ 4,018,948
Net identifiable assets   383,861          
Goodwill $ 58,000 $ 675,643 $ 58,000 $ 676,200 $ 0 $ 57,520 $ 676,167