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Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2019
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, 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
%
    
7.000
%
    
6.50
%
NBT Bank
    
894,407
      
11.76
%
    
4.50
%
    
7.000
%
    
6.50
%
Tier I Capital (to risk-weighted assets)
                                        
Company
    
963,147
      
12.56
%
    
6.00
%
    
8.500
%
    
8.00
%
NBT Bank
    
894,407
      
11.76
%
    
6.00
%
    
8.500
%
    
8.00
%
Total Capital (to risk-weighted assets)
                                        
Company
    
1,037,041
      
13.52
%
    
8.00
%
    
10.500
%
    
10.00
%
NBT Bank
    
968,301
      
12.73
%
    
8.00
%
    
10.500
%
    
10.00
%
                                         
As of December 31, 2018
                                        
Tier I Capital (to average assets)
                                        
Company
  
$
880,448
      
9.52
%
    
4.00
%
            
5.00
%
NBT Bank
    
825,863
      
8.98
%
    
4.00
%
            
5.00
%
Common Equity Tier 1 Capital
                                        
Company
    
783,448
      
10.49
%
    
4.50
%
    
6.375
%
    
6.50
%
NBT Bank
    
825,863
      
11.14
%
    
4.50
%
    
6.375
%
    
6.50
%
Tier I Capital (to risk-weighted assets)
                                        
Company
    
880,448
      
11.79
%
    
6.00
%
    
7.875
%
    
8.00
%
NBT Bank
    
825,863
      
11.14
%
    
6.00
%
    
7.875
%
    
8.00
%
Total Capital (to risk-weighted assets)
                                        
Company
    
954,232
      
12.78
%
    
8.00
%
    
9.875
%
    
10.00
%
NBT Bank
    
899,647
      
12.14
%
    
8.00
%
    
9.875
%
    
10.00
%