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v3.22.0.1

Parent Company Financial Information, Condensed Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Consolidated Statements of Income [Abstract] |  |  |
Net securities gains (losses) | $ 566 | $ (388) | $ 4,213
Interest, dividends and other income | 339,876 | 348,282 | 367,534
Income before income tax expense | 199,858 | 133,087 | 155,432
Income tax benefit | 44,973 | 28,699 | 34,411
Net income | 154,885 | 104,388 | 121,021
NBT Bancorp Inc [Member] |  |  |
Consolidated Statements of Income [Abstract] |  |  |
Dividends from subsidiaries | 118,900 | 77,000 | 50,200
Management fee from subsidiaries | 2,653 | 4,151 | 7,981
Net securities gains (losses) | 543 | (483) | 165
Interest, dividends and other income | 564 | 824 | 876
Total revenue | 122,660 | 81,492 | 59,222
Operating expenses | 11,956 | 11,825 | 14,262
Income before income tax expense | 110,704 | 69,667 | 44,960
Income tax benefit | (2,250) | (2,653) | (1,588)
Equity in undistributed income of subsidiaries | 41,931 | 32,068 | 74,473
Net income | $ 154,885 | $ 104,388 | $ 121,021

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