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Regulatory Capital Requirements (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Tier 1 Capital (to average assets) [Abstract]    
Tier 1 capital to average assets $ 1,301,560 $ 1,193,336
Tier 1 capital to average assets ratio 0.0971 0.1032
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 $ 1,204,560 $ 1,096,336
Common equity Tier 1 capital ratio 0.1157 0.1212
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 $ 1,301,560 $ 1,193,336
Tier 1 capital to risk weighted assets ratio 0.125 0.1319
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 $ 1,534,826 $ 1,391,182
Total capital to risk weighted assets ratio 0.1475 0.1538
Minimum capital required for capital adequacy to risk weighted assets 0.08 0.08
Total capital required for capital adequacy plus buffer to average 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 $ 1,223,551 $ 1,133,481
Tier 1 capital to average assets ratio 0.0916 0.0986
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 $ 1,223,551 $ 1,133,481
Common equity Tier 1 capital ratio 0.1184 0.1263
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 $ 1,223,551 $ 1,133,481
Tier 1 capital to risk weighted assets ratio 0.1184 0.1263
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 $ 1,333,817 $ 1,233,327
Total capital to risk weighted assets ratio 0.1291 0.1374
Minimum capital required for capital adequacy to risk weighted assets 0.08 0.08
Total capital required for capital adequacy plus buffer to average assets 0.105 0.105
Capital required for classification as well capitalized to risk weighted assets 0.10 0.10