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Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2016
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 as of December 31, 2016 and 2015:

 
 
Actual
  
Regulatory ratio requirements
 
(Dollars in thousands)
 
Amount
  
Ratio
  
Minimum
capital adequacy
  
For classification
as well- capitalized
 
As of December 31, 2016
            
Total Capital (to risk weighted assets)
            
Company
 
$
839,152
   
12.39
%
  
8.00
%
  
10.00
%
NBT Bank
  
790,034
   
11.75
%
  
8.00
%
  
10.00
%
Tier I Capital (to risk weighted assets)
                
Company
  
773,111
   
11.42
%
  
4.00
%
  
6.00
%
NBT Bank
  
723,992
   
10.76
%
  
4.00
%
  
6.00
%
Tier I Capital (to average assets)
                
Company
  
773,111
   
9.11
%
  
4.00
%
  
5.00
%
NBT Bank
  
723,992
   
8.59
%
  
4.00
%
  
5.00
%
Common Equity Tier 1 Capital
                
Company
  
676,111
   
9.98
%
  
4.50
%
  
6.50
%
NBT Bank
  
723,992
   
10.76
%
  
4.50
%
  
6.50
%
 
                
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
%