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REGULATORY MATTERS (Tables)
 12 Months Ended
Dec. 31, 2018
REGULATORY MATTERS [Abstract]  
Capital Ratios and Amounts
  
Actual
  
For capital adequacy
purposes
  
For capital adequacy
purposes plus Capital
Conservation Buffer
  
To be well-capitalized
under prompt
corrective action
 
(000’s omitted)
 
Amount
  
Ratio
  
Amount
  
Ratio
  
Amount
  
Ratio
  
Amount
  
Ratio
 
Community Bank System, Inc.:
                        
2018
                        
Tier 1 Leverage ratio
 
$
1,093,166
   
11.08
%
 
$
394,700
   
4.00
%
       
$
493,375
   
5.00
%
Tier 1 risk-based capital
  
1,093,166
   
18.23
%
  
359,747
   
6.00
%
 
$
472,168
   
7.875
%
  
479,662
   
8.00
%
Total risk-based capital
  
1,142,927
   
19.06
%
  
479,662
   
8.00
%
  
592,083
   
9.875
%
  
599,578
   
10.00
%
Common equity tier 1 capital
  
998,111
   
16.65
%
  
269,810
   
4.50
%
  
382,231
   
6.375
%
  
389,726
   
6.50
%
2017
                                
Tier 1 Leverage ratio
 
$
995,860
   
10.00
%
 
$
398,183
   
4.00
%
         
$
497,729
   
5.00
%
Tier 1 risk-based capital
  
995,860
   
16.64
%
  
358,988
   
6.00
%
 
$
433,777
   
7.25
%
  
478,651
   
8.00
%
Total risk-based capital
  
1,043,910
   
17.45
%
  
478,651
   
8.00
%
  
553,440
   
9.25
%
  
598,314
   
10.00
%
Common equity tier 1 capital
  
876,685
   
14.65
%
  
269,241
   
4.50
%
  
344,030
   
5.75
%
  
388,904
   
6.50
%
                                 
Community Bank, N.A.:
                                
2018
                                
Tier 1 Leverage ratio
 
$
912,995
   
9.32
%
 
$
391,953
   
4.00
%
         
$
489,941
   
5.00
%
Tier 1 risk-based capital
  
912,995
   
15.35
%
  
356,973
   
6.00
%
 
$
468,527
   
7.875
%
  
475,964
   
8.00
%
Total risk-based capital
  
962,756
   
16.18
%
  
475,964
   
8.00
%
  
587,518
   
9.875
%
  
594,955
   
10.00
%
Common equity tier 1 capital
  
912,940
   
15.35
%
  
267,730
   
4.50
%
  
379,284
   
6.375
%
  
386,721
   
6.50
%
2017
                                
Tier 1 Leverage ratio
 
$
859,538
   
8.71
%
 
$
394,981
   
4.00
%
         
$
493,726
   
5.00
%
Tier 1 risk-based capital
  
859,538
   
14.50
%
  
355,641
   
6.00
%
 
$
429,733
   
7.25
%
  
474,188
   
8.00
%
Total risk-based capital
  
907,588
   
15.31
%
  
474,188
   
8.00
%
  
548,280
   
9.25
%
  
592,736
   
10.00
%
Common equity tier 1 capital
  
859,483
   
14.50
%
  
266,731
   
4.50
%
  
340,823
   
5.75
%
  
385,278
   
6.50
%