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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