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PREMISES AND EQUIPMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]      
Premises $ 176,949 $ 166,128  
Furniture and equipment 44,647 41,810  
Premises and equipment, gross 221,596 207,938  
Less: Accumulated depreciation 77,684 71,966  
Premises and equipment, net 143,912 135,972  
Depreciation [Abstract]      
Accumulated depreciation of assets written off 1,500 2,200  
Depreciation expense $ 7,300 $ 8,400 $ 8,100