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PREMISES AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Premises and Equipment    
Gross premises and equipment $ 155,215 $ 148,293
Accumulated depreciation and amortization (108,872) (103,008)
Net premises and equipment 46,343 45,285
Land    
Premises and Equipment    
Gross premises and equipment 8,309 8,309
Office buildings and improvements    
Premises and Equipment    
Gross premises and equipment 107,840 102,398
Furniture, fixtures and equipment    
Premises and Equipment    
Gross premises and equipment $ 39,066 $ 37,586