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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Tier I Capital (to average assets) [Abstract]    
Tier I capital to average assets $ 963,147 $ 880,448
Tier I capital to average assets ratio 10.33% 9.52%
Minimum Tier I leverage capital required for capital adequacy to average assets 4.00% 4.00%
Tier I leverage capital required for classification as well capitalized to average assets 5.00% 5.00%
Common Equity Tier I Capital [Abstract]    
Common equity Tier I capital $ 866,147 $ 783,448
Common equity Tier I capital ratio 11.29% 10.49%
Minimum Tier I capital required for capital adequacy 4.50% 4.50%
Minimum Tier I capital required for capital adequacy plus buffer 7.00% 6.375%
Tier I capital required for classification as well capitalized 6.50% 6.50%
Tier I Capital (to risk weighted assets) [Abstract]    
Tier I capital to risk weighted assets $ 963,147 $ 880,448
Tier I capital to risk weighted assets ratio 12.56% 11.79%
Minimum Tier I capital required for capital adequacy to risk weighted assets 6.00% 6.00%
Minimum Tier I capital required for capital adequacy plus buffer to risk weighted assets 8.50% 7.875%
Tier I capital required for classification as well capitalized to risk weighted assets 8.00% 8.00%
Total Capital (to risk weighted assets) [Abstract]    
Total capital to risk weighted assets $ 1,037,041 $ 954,232
Total capital to risk weighted assets ratio 13.52% 12.78%
Minimum capital required for capital adequacy to risk weighted assets 8.00% 8.00%
Total capital required for capital adequacy plus buffer to average assets 10.50% 9.875%
Capital required for classification as well capitalized to risk weighted assets 10.00% 10.00%
NBT Bank [Member]    
Tier I Capital (to average assets) [Abstract]    
Tier I capital to average assets $ 894,407 $ 825,863
Tier I capital to average assets ratio 9.64% 8.98%
Minimum Tier I leverage capital required for capital adequacy to average assets 4.00% 4.00%
Tier I leverage capital required for classification as well capitalized to average assets 5.00% 5.00%
Common Equity Tier I Capital [Abstract]    
Common equity Tier I capital $ 894,407 $ 825,863
Common equity Tier I capital ratio 11.76% 11.14%
Minimum Tier I capital required for capital adequacy 4.50% 4.50%
Minimum Tier I capital required for capital adequacy plus buffer 7.00% 6.375%
Tier I capital required for classification as well capitalized 6.50% 6.50%
Tier I Capital (to risk weighted assets) [Abstract]    
Tier I capital to risk weighted assets $ 894,407 $ 825,863
Tier I capital to risk weighted assets ratio 11.76% 11.14%
Minimum Tier I capital required for capital adequacy to risk weighted assets 6.00% 6.00%
Minimum Tier I capital required for capital adequacy plus buffer to risk weighted assets 8.50% 7.875%
Tier I capital required for classification as well capitalized to risk weighted assets 8.00% 8.00%
Total Capital (to risk weighted assets) [Abstract]    
Total capital to risk weighted assets $ 968,301 $ 899,647
Total capital to risk weighted assets ratio 12.73% 12.14%
Minimum capital required for capital adequacy to risk weighted assets 8.00% 8.00%
Total capital required for capital adequacy plus buffer to average assets 10.50% 9.875%
Capital required for classification as well capitalized to risk weighted assets 10.00% 10.00%