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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS-Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 100,544 $ 58,120
Finite-Lived Intangible Assets, Accumulated Amortization 24,343 17,315
Core Deposits    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 51,031 54,357
Finite-Lived Intangible Assets, Accumulated Amortization 21,149 16,500
Customer Lists    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 39,420 0
Finite-Lived Intangible Assets, Accumulated Amortization 1,195 0
Other    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 10,093 3,763
Finite-Lived Intangible Assets, Accumulated Amortization $ 1,999 $ 815