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PREMISES AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Premises and Equipment    
Gross premises and equipment $ 191,327 $ 174,587
Accumulated depreciation and amortization (110,973) (109,309)
Net premises and equipment 80,354 65,278
Land    
Premises and Equipment    
Gross premises and equipment 14,184 11,616
Office buildings and improvements    
Premises and Equipment    
Gross premises and equipment 141,628 125,132
Furniture, fixtures and equipment    
Premises and Equipment    
Gross premises and equipment $ 35,515 $ 37,839