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Regulatory Capital Requirements (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Tier I Capital (to average assets) [Abstract]    
Tier I capital to average assets $ 1,193,336 $ 1,103,661
Tier I capital to average assets ratio 0.1032 0.0941
Minimum Tier I leverage capital required for capital adequacy to average assets 0.04 0.04
Tier I leverage capital required for classification as well capitalized to average assets 0.05 0.05
Common Equity Tier I Capital [Abstract]    
Common equity Tier I capital $ 1,096,336 $ 1,006,661
Common equity Tier I capital ratio 0.1212 0.1225
Minimum Tier I capital required for capital adequacy 0.045 0.045
Minimum Tier I capital required for capital adequacy plus buffer 0.07 0.07
Tier I capital required for classification as well capitalized 0.065 0.065
Tier I Capital (to risk weighted assets) [Abstract]    
Tier I capital to risk weighted assets $ 1,193,336 $ 1,103,661
Tier I capital to risk weighted assets ratio 0.1319 0.1343
Minimum Tier I capital required for capital adequacy to risk weighted assets 0.06 0.06
Minimum Tier I capital required for capital adequacy plus buffer to risk weighted assets 0.085 0.085
Tier I 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 $ 1,391,182 $ 1,292,669
Total capital to risk weighted assets ratio 0.1538 0.1573
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 I Capital (to average assets) [Abstract]    
Tier I capital to average assets $ 1,133,481 $ 1,087,990
Tier I capital to average assets ratio 0.0986 0.0932
Minimum Tier I leverage capital required for capital adequacy to average assets 0.04 0.04
Tier I leverage capital required for classification as well capitalized to average assets 0.05 0.05
Common Equity Tier I Capital [Abstract]    
Common equity Tier I capital $ 1,133,481 $ 1,087,990
Common equity Tier I capital ratio 0.1263 0.1336
Minimum Tier I capital required for capital adequacy 0.045 0.045
Minimum Tier I capital required for capital adequacy plus buffer 0.07 0.07
Tier I capital required for classification as well capitalized 0.065 0.065
Tier I Capital (to risk weighted assets) [Abstract]    
Tier I capital to risk weighted assets $ 1,133,481 $ 1,087,990
Tier I capital to risk weighted assets ratio 0.1263 0.1336
Minimum Tier I capital required for capital adequacy to risk weighted assets 0.06 0.06
Minimum Tier I capital required for capital adequacy plus buffer to risk weighted assets 0.085 0.085
Tier I 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 $ 1,233,327 $ 1,176,998
Total capital to risk weighted assets ratio 0.1374 0.1445
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