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Regulatory Capital Requirements (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Tier 1 Capital (to average assets) [Abstract]    
Tier 1 capital to average assets $ 1,385,269 $ 1,301,560
Tier 1 capital to average assets ratio 0.1024 0.0971
Minimum Tier 1 leverage capital required for capital adequacy to average assets 0.04 0.04
Tier 1 leverage capital required for classification as well capitalized to average assets 0.05 0.05
Common Equity Tier 1 Capital [Abstract]    
Common equity Tier 1 capital $ 1,288,269 $ 1,204,560
Common equity Tier 1 capital ratio 0.1193 0.1157
Minimum Tier 1 capital required for capital adequacy 0.045 0.045
Minimum Tier 1 capital required for capital adequacy plus buffer 0.07 0.07
Tier 1 capital required for classification as well capitalized 0.065 0.065
Tier 1 Capital (to risk-weighted assets) [Abstract]    
Tier 1 capital to risk-weighted assets $ 1,385,269 $ 1,301,560
Tier 1 capital to risk-weighted assets ratio 0.1283 0.125
Minimum Tier 1 capital required for capital adequacy to risk-weighted assets 0.06 0.06
Minimum Tier 1 capital required for capital adequacy plus buffer to risk-weighted assets 0.085 0.085
Tier 1 capital required for classification as well capitalized to risk-weighted assets 0.08 0.08
Total Capital (to risk-weighted assets) [Abstract]    
Total capital to risk-weighted assets $ 1,622,476 $ 1,534,826
Total capital to risk-weighted assets ratio 0.1503 0.1475
Minimum capital required for capital adequacy to risk-weighted assets 0.08 0.08
Total capital required for capital adequacy plus buffer to risk-weighted assets 0.105 0.105
Capital required for classification as well capitalized to risk-weighted assets 0.10 0.10
Permissible capital transition relief period 5 years  
NBT Bank [Member]    
Tier 1 Capital (to average assets) [Abstract]    
Tier 1 capital to average assets $ 1,263,661 $ 1,223,551
Tier 1 capital to average assets ratio 0.0939 0.0916
Minimum Tier 1 leverage capital required for capital adequacy to average assets 0.04 0.04
Tier 1 leverage capital required for classification as well capitalized to average assets 0.05 0.05
Common Equity Tier 1 Capital [Abstract]    
Common equity Tier 1 capital $ 1,263,661 $ 1,223,551
Common equity Tier 1 capital ratio 0.1179 0.1184
Minimum Tier 1 capital required for capital adequacy 0.045 0.045
Minimum Tier 1 capital required for capital adequacy plus buffer 0.07 0.07
Tier 1 capital required for classification as well capitalized 0.065 0.065
Tier 1 Capital (to risk-weighted assets) [Abstract]    
Tier 1 capital to risk-weighted assets $ 1,263,661 $ 1,223,551
Tier 1 capital to risk-weighted assets ratio 0.1179 0.1184
Minimum Tier 1 capital required for capital adequacy to risk-weighted assets 0.06 0.06
Minimum Tier 1 capital required for capital adequacy plus buffer to risk-weighted assets 0.085 0.085
Tier 1 capital required for classification as well capitalized to risk-weighted assets 0.08 0.08
Total Capital (to risk-weighted assets) [Abstract]    
Total capital to risk-weighted assets $ 1,377,868 $ 1,333,817
Total capital to risk-weighted assets ratio 0.1286 0.1291
Minimum capital required for capital adequacy to risk-weighted assets 0.08 0.08
Total capital required for capital adequacy plus buffer to risk-weighted assets 0.105 0.105
Capital required for classification as well capitalized to risk-weighted assets 0.10 0.10