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Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2020
Regulatory Capital Requirements [Abstract]  
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, 2020
                              
Tier I Capital (to average assets)
                              
Company
  
$
1,018,320
      
9.56
%
    
4.00
%
          
5.00
%
NBT Bank
    
1,054,097
      
9.95
%
    
4.00
%
          
5.00
%
Common Equity Tier 1 Capital
                                      
Company
    
921,320
      
11.84
%
    
4.50
%
    
7.00
%
    
6.50
%
NBT Bank
    
1,054,097
      
13.67
%
    
4.50
%
    
7.00
%
    
6.50
%
Tier I Capital (to risk-weighted assets)
                                        
Company
    
1,018,320
      
13.09
%
    
6.00
%
    
8.50
%
    
8.00
%
NBT Bank
    
1,054,097
      
13.67
%
    
6.00
%
    
8.50
%
    
8.00
%
Total Capital (to risk-weighted assets)
                                        
Company
    
1,215,672
      
15.62
%
    
8.00
%
    
10.50
%
    
10.00
%
NBT Bank
    
1,150,544
      
14.93
%
    
8.00
%
    
10.50
%
    
10.00
%
                                         
As of December 31, 2019
                                        
Tier I Capital (to average assets)
                                        
Company
  
$
963,147
      
10.33
%
    
4.00
%
            
5.00
%
NBT Bank
    
894,407
      
9.64
%
    
4.00
%
            
5.00
%
Common Equity Tier 1 Capital
                                        
Company
    
866,147
      
11.29
%
    
4.50
%
    
7.00
%
    
6.50
%
NBT Bank
    
894,407
      
11.76
%
    
4.50
%
    
7.00
%
    
6.50
%
Tier I Capital (to risk-weighted assets)
                                        
Company
    
963,147
      
12.56
%
    
6.00
%
    
8.50
%
    
8.00
%
NBT Bank
    
894,407
      
11.76
%
    
6.00
%
    
8.50
%
    
8.00
%
Total Capital (to risk-weighted assets)
                                        
Company
    
1,037,041
      
13.52
%
    
8.00
%
    
10.50
%
    
10.00
%
NBT Bank
    
968,301
      
12.73
%
    
8.00
%
    
10.50
%
    
10.00
%