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Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2023
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, 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
%
                                         
As of December 31, 2022
                                        
Tier 1 Capital (to average assets)
                                        
Company
  
$
1,193,336
      
10.32
%
    
4.00
%
            
5.00
%
NBT Bank
    
1,133,481
      
9.86
%
    
4.00
%
            
5.00
%
Common Equity Tier 1 Capital
                                        
Company
    
1,096,336
      
12.12
%
    
4.50
%
    
7.00
%
    
6.50
%
NBT Bank
    
1,133,481
      
12.63
%
    
4.50
%
    
7.00
%
    
6.50
%
Tier 1 Capital (to risk-weighted assets)
                                        
Company
    
1,193,336
      
13.19
%
    
6.00
%
    
8.50
%
    
8.00
%
NBT Bank
    
1,133,481
      
12.63
%
    
6.00
%
    
8.50
%
    
8.00
%
Total Capital (to risk-weighted assets)
                                        
Company
    
1,391,182
      
15.38
%
    
8.00
%
    
10.50
%
    
10.00
%
NBT Bank
    
1,233,327
      
13.74
%
    
8.00
%
    
10.50
%
    
10.00
%