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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2019
EARNINGS PER SHARE [Abstract]  
Reconciliation of Basic to Diluted Earnings per Share
The following is a reconciliation of basic to diluted earnings per share for the years ended December 31, 2019, 2018 and 2017.

(000’s omitted, except per share data)
  
2019
    
2018
    
2017
  
Net income
  
$
169,063
    
$
168,641
    
$
150,717
  
Income attributable to unvested stock-based compensation awards
    
(400
)
    
(744
)
    
(597
)
Income available to common shareholders
  
$
168,663
    
$
167,897
    
$
150,120
  
                         
Weighted-average common shares outstanding - basic
    
51,732
      
51,165
      
48,843
  
                         
Basic earnings per share
  
$
3.26
    
$
3.28
    
$
3.07
  
                         
Net income
  
$
169,063
    
$
168,641
    
$
150,717
  
Income attributable to unvested stock-based compensation awards
    
(400
)
    
(744
)
    
(597
)
Income available to common shareholders
  
$
168,663
    
$
167,897
    
$
150,120
  
                         
Weighted-average common shares outstanding
    
51,732
      
51,165
      
48,843
  
Assumed exercise of stock options
    
516
      
583
      
627
  
Weighted-average common shares outstanding – diluted
    
52,248
      
51,748
      
49,470
  
                         
Diluted earnings per share
  
$
3.23
    
$
3.24
    
$
3.03
  
Cash dividends declared per share
  
$
1.58
    
$
1.44
    
$
1.32