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Regulatory Capital Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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%

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