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Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2015
Regulatory Capital Requirements [Abstract]  
Schedule of compliance with regulatory compliance requirements under banking regulations
The Company and NBT Bank's actual capital amounts and ratios are presented as follows:

 
 
Actual
  
Regulatory ratio requirements
 
(Dollars in thousands)
 
Amount
  
Ratio
  
Minimum
capital adequacy
  
For classification
as well capitalized
 
As of December 31, 2015
 
  
  
  
 
Total Capital (to risk weighted assets):
 
  
  
  
 
Company
 
$
809,685
   
12.74
%
  
8.00
%
  
10.00
%
NBT Bank
  
724,238
   
11.47
%
  
8.00
%
  
10.00
%
Tier I Capital (to risk weighted assets)
                
Company
  
745,341
   
11.73
%
  
4.00
%
  
6.00
%
NBT Bank
  
659,894
   
10.45
%
  
4.00
%
  
6.00
%
Tier I Capital (to average assets)
                
Company
  
745,341
   
9.44
%
  
4.00
%
  
5.00
%
NBT Bank
  
659,894
   
8.41
%
  
4.00
%
  
5.00
%
Common Equity Tier 1 Capital
                
Company
  
648,341
   
10.20
%
  
4.50
%
  
6.50
%
NBT Bank
  
659,894
   
10.45
%
  
4.50
%
  
6.50
%
 
                
As of December 31, 2014
                
Total Capital (to risk weighted assets):
                
Company
 
$
777,651
   
13.50
%
  
8.00
%
  
10.00
%
NBT Bank
  
727,771
   
12.72
%
  
8.00
%
  
10.00
%
Tier I Capital (to risk weighted assets)
                
Company
  
709,965
   
12.32
%
  
4.00
%
  
6.00
%
NBT Bank
  
660,086
   
11.54
%
  
4.00
%
  
6.00
%
Tier I Capital (to average assets)
                
Company
  
709,965
   
9.39
%
  
4.00
%
  
5.00
%
NBT Bank
  
660,086
   
8.79
%
  
4.00
%
  
5.00
%