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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, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 100,564 $ 100,544
Finite-Lived Intangible Assets, Accumulated Amortization 36,012 24,343
Core Deposits    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 51,031 51,031
Finite-Lived Intangible Assets, Accumulated Amortization 27,524 21,149
Customer Lists    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 39,420 39,420
Finite-Lived Intangible Assets, Accumulated Amortization 4,778 1,195
Other    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 10,113 10,093
Finite-Lived Intangible Assets, Accumulated Amortization $ 3,710 $ 1,999