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PREMISES AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Premises and Equipment    
Gross premises and equipment $ 148,293 $ 145,755
Accumulated depreciation and amortization (103,008) (97,407)
Net premises and equipment 45,285 48,348
Land    
Premises and Equipment    
Gross premises and equipment 8,309 8,309
Office buildings and improvements    
Premises and Equipment    
Gross premises and equipment 102,398 100,314
Furniture, fixtures and equipment    
Premises and Equipment    
Gross premises and equipment $ 37,586 $ 37,132