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v3.25.0.1

Parent Company Financial Information, Condensed Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Consolidated Statements of Income [Abstract] |  |  |
Net securities gains (losses) | $ 2,789 | $ (9,315) | $ (1,131)
Interest, dividends and other income | 611,670 | 522,789 | 384,070
Income before income tax expense | 179,458 | 153,459 | 196,156
Income tax expense (benefit) | 38,817 | 34,677 | 44,161
Net income | 140,641 | 118,782 | 151,995
NBT Bancorp Inc [Member] |  |  |
Consolidated Statements of Income [Abstract] |  |  |
Dividends from subsidiaries | 100,000 | 116,250 | 119,000
Management fee from subsidiaries | 5,797 | 7,093 | 2,005
Net securities gains (losses) | 575 | (82) | (618)
Interest, dividends and other income | 726 | 715 | 638
Total revenue | 107,098 | 123,976 | 121,025
Operating expenses | 25,491 | 22,930 | 14,035
Income before income tax expense | 81,607 | 101,046 | 106,990
Income tax expense (benefit) | (4,310) | (3,785) | (3,027)
Equity in undistributed income of subsidiaries | 54,724 | 13,951 | 41,978
Net income | $ 140,641 | $ 118,782 | $ 151,995

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