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Regulatory Capital Requirements (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Tier I Capital (to average assets) [Abstract] |  |
Tier I capital to average assets | $ 1,103,661 | $ 1,018,320
Tier I capital to average assets ratio | 0.0941 | 0.0956
Minimum Tier I leverage capital required for capital adequacy to average assets | 0.0400 | 0.0400
Tier I leverage capital required for classification as well capitalized to average assets | 0.0500 | 0.0500
Common Equity Tier I Capital [Abstract] |  |
Common equity Tier I capital | $ 1,006,661 | $ 921,320
Common equity Tier I capital ratio | 0.1225 | 0.1184
Minimum Tier I capital required for capital adequacy | 0.0450 | 0.0450
Minimum Tier I capital required for capital adequacy plus buffer | 0.0700 | 0.0700
Tier I capital required for classification as well capitalized | 0.0650 | 0.0650
Tier I Capital (to risk weighted assets) [Abstract] |  |
Tier I capital to risk weighted assets | $ 1,103,661 | $ 1,018,320
Tier I capital to risk weighted assets ratio | 0.1343 | 0.1309
Minimum Tier I capital required for capital adequacy to risk weighted assets | 0.0600 | 0.0600
Minimum Tier I capital required for capital adequacy plus buffer to risk weighted assets | 0.0850 | 0.0850
Tier I capital required for classification as well capitalized to risk weighted assets | 0.0800 | 0.0800
Total Capital (to risk weighted assets) [Abstract] |  |
Total capital to risk weighted assets | $ 1,292,669 | $ 1,215,672
Total capital to risk weighted assets ratio | 0.1573 | 0.1562
Minimum capital required for capital adequacy to risk weighted assets | 0.0800 | 0.0800
Total capital required for capital adequacy plus buffer to average assets | 0.1050 | 0.1050
Capital required for classification as well capitalized to risk weighted assets | 0.1000 | 0.1000
Permissible capital transition relief period | 5 years |
NBT Bank [Member] |  |
Tier I Capital (to average assets) [Abstract] |  |
Tier I capital to average assets | $ 1,087,990 | $ 1,054,097
Tier I capital to average assets ratio | 0.0932 | 0.0995
Minimum Tier I leverage capital required for capital adequacy to average assets | 0.0400 | 0.0400
Tier I leverage capital required for classification as well capitalized to average assets | 0.0500 | 0.0500
Common Equity Tier I Capital [Abstract] |  |
Common equity Tier I capital | $ 1,087,990 | $ 1,054,097
Common equity Tier I capital ratio | 0.1336 | 0.1367
Minimum Tier I capital required for capital adequacy | 0.0450 | 0.0450
Minimum Tier I capital required for capital adequacy plus buffer | 0.0700 | 0.0700
Tier I capital required for classification as well capitalized | 0.0650 | 0.0650
Tier I Capital (to risk weighted assets) [Abstract] |  |
Tier I capital to risk weighted assets | $ 1,087,990 | $ 1,054,097
Tier I capital to risk weighted assets ratio | 0.1336 | 0.1367
Minimum Tier I capital required for capital adequacy to risk weighted assets | 0.0600 | 0.0600
Minimum Tier I capital required for capital adequacy plus buffer to risk weighted assets | 0.0850 | 0.0850
Tier I capital required for classification as well capitalized to risk weighted assets | 0.0800 | 0.0800
Total Capital (to risk weighted assets) [Abstract] |  |
Total capital to risk weighted assets | $ 1,176,998 | $ 1,150,544
Total capital to risk weighted assets ratio | 0.1445 | 0.1493
Minimum capital required for capital adequacy to risk weighted assets | 0.0800 | 0.0800
Total capital required for capital adequacy plus buffer to average assets | 0.1050 | 0.1050
Capital required for classification as well capitalized to risk weighted assets | 0.1000 | 0.1000

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- Definition The minimum Common Equity Tier 1 Capital ratio (Common Equity Tier 1 Capital divided by Risk-based Assets) required for capital adequacy plus buffer purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
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