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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Other Intangibles (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 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 $ (21,038) (17,315)
Core deposits    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets amortization method accelerated basis  
Finite-Lived Intangible Assets, Gross $ 51,031 54,357
Finite-Lived Intangible Assets, Accumulated Amortization $ (19,200) (16,500)
Customer lists    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets amortization method straight-line basis  
Finite-Lived Intangible Assets, Gross $ 39,420 0
Finite-Lived Intangible Assets, Accumulated Amortization (299) 0
Other    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 10,093 3,763
Finite-Lived Intangible Assets, Accumulated Amortization $ (1,539) $ (815)