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Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2017
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
  
Minimum plus Buffer
  
For
Classification
as Well-
Capitalized
 
As of December 31, 2017
               
Tier I Capital (to average assets)
               
Company
 
$
810,445
   
9.14
%
  
4.00
%
     
5.00
%
NBT Bank
  
756,521
   
8.59
%
  
4.00
%
     
5.00
%
Common Equity Tier 1 Capital
                   
Company
  
713,445
   
10.06
%
  
4.50
%
  
5.75
%
  
6.50
%
NBT Bank
  
756,521
   
10.74
%
  
4.50
%
  
5.75
%
  
6.50
%
Tier I Capital (to risk-weighted assets)
                    
Company
  
810,445
   
11.42
%
  
6.00
%
  
7.25
%
  
6.00
%
NBT Bank
  
756,521
   
10.74
%
  
6.00
%
  
7.25
%
  
6.00
%
Total Capital (to risk-weighted assets)
                    
Company
  
880,874
   
12.42
%
  
8.00
%
  
9.25
%
  
10.00
%
NBT Bank
  
826,950
   
11.74
%
  
8.00
%
  
9.25
%
  
10.00
%
 
                    
As of December 31, 2016
                    
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
%
  
5.125
%
  
6.50
%
NBT Bank
  
723,992
   
10.76
%
  
4.50
%
  
5.125
%
  
6.50
%
Tier I Capital (to risk-weighted assets)
                    
Company
  
773,111
   
11.42
%
  
6.00
%
  
6.625
%
  
8.00
%
NBT Bank
  
723,992
   
10.76
%
  
6.00
%
  
6.625
%
  
8.00
%
Total Capital (to risk-weighted assets)
                    
Company
  
839,152
   
12.39
%
  
8.00
%
  
8.625
%
  
10.00
%
NBT Bank
  
790,034
   
11.75
%
  
8.00
%
  
8.625
%
  
10.00
%