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Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2024
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, 2024
                              
Tier 1 Capital (to average assets)
                              
Company
  
$
1,385,269
      
10.24
%
    
4.00
%
          
5.00
%
NBT Bank
    
1,263,661
      
9.39
%
    
4.00
%
          
5.00
%
Common Equity Tier 1 Capital
                                      
Company
    
1,288,269
      
11.93
%
    
4.50
%
    
7.00
%
    
6.50
%
NBT Bank
    
1,263,661
      
11.79
%
    
4.50
%
    
7.00
%
    
6.50
%
Tier 1 Capital (to risk-weighted assets)
                                        
Company
    
1,385,269
      
12.83
%
    
6.00
%
    
8.50
%
    
8.00
%
NBT Bank
    
1,263,661
      
11.79
%
    
6.00
%
    
8.50
%
    
8.00
%
Total Capital (to risk-weighted assets)
                                        
Company
    
1,622,476
      
15.03
%
    
8.00
%
    
10.50
%
    
10.00
%
NBT Bank
    
1,377,868
      
12.86
%
    
8.00
%
    
10.50
%
    
10.00
%
                                         
As of December 31, 2023
                                        
Tier 1 Capital (to average assets)
                                        
Company
  
$
1,301,560
      
9.71
%
    
4.00
%
            
5.00
%
NBT Bank
    
1,223,551
      
9.16
%
    
4.00
%
            
5.00
%
Common Equity Tier 1 Capital
                                        
Company
    
1,204,560
      
11.57
%
    
4.50
%
    
7.00
%
    
6.50
%
NBT Bank
    
1,223,551
      
11.84
%
    
4.50
%
    
7.00
%
    
6.50
%
Tier 1 Capital (to risk-weighted assets)
                                        
Company
    
1,301,560
      
12.50
%
    
6.00
%
    
8.50
%
    
8.00
%
NBT Bank
    
1,223,551
      
11.84
%
    
6.00
%
    
8.50
%
    
8.00
%
Total Capital (to risk-weighted assets)
                                        
Company
    
1,534,826
      
14.75
%
    
8.00
%
    
10.50
%
    
10.00
%
NBT Bank
    
1,333,817
      
12.91
%
    
8.00
%
    
10.50
%
    
10.00
%