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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

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