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PREMISES AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2017
PREMISES AND EQUIPMENT [Abstract]  
Components of Premises and Equipment
Premises and equipment consist of the following at December 31:

(000's omitted)
 
2017
  
2016
 
Land and land improvements
 
$
23,869
  
$
22,585
 
Bank premises
  
131,647
   
116,663
 
Equipment and construction in progress
  
86,059
   
80,527
 
Premises and equipment, gross
  
241,575
   
219,775
 
Accumulated depreciation
  
(118,182
)
  
(107,457
)
Premises and equipment, net
 
$
123,393
  
$
112,318