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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2016
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 three and six months ended June 30, 2016 and 2015:

  
Three Months Ended
  
Six Months Ended
 
  
June 30,
  
June 30,
 
(000's omitted, except per share data)
 
2016
  
2015
  
2016
  
2015
 
Net income
 
$
25,857
  
$
23,840
  
$
50,260
  
$
46,137
 
Income attributable to unvested stock-based compensation awards
  
(151
)
  
(99
)
  
(242
)
  
(177
)
Income available to common shareholders
 
$
25,706
  
$
23,741
  
$
50,018
  
$
45,960
 
                 
Weighted-average common shares outstanding – basic
  
44,021
   
40,690
   
43,942
   
40,674
 
Basic earnings per share
 
$
0.58
  
$
0.58
  
$
1.14
  
$
1.13
 
                 
Net income
 
$
25,857
  
$
23,840
  
$
50,260
  
$
46,137
 
Income attributable to unvested stock-based compensation awards
  
(151
)
  
(99
)
  
(242
)
  
(177
)
Income available to common shareholders
 
$
25,706
  
$
23,741
  
$
50,018
  
$
45,960
 
                 
Weighted-average common shares outstanding – basic
  
44,021
   
40,690
   
43,942
   
40,674
 
Assumed exercise of stock options
  
357
   
404
   
347
   
405
 
Weighted-average common shares outstanding – diluted
  
44,378
   
41,094
   
44,289
   
41,079
 
Diluted earnings per share
 
$
0.58
  
$
0.58
  
$
1.13
  
$
1.12