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Parent Company Financial Information, Condensed Income Statements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Income Statements [Abstract]      
Net securities (losses) gains $ (388) $ 4,213 $ (6,341)
Interest, dividends and other income 348,282 367,534 344,255
Income before income tax expense 133,087 155,432 137,002
Income tax benefit 28,699 34,411 24,436
Net income 104,388 121,021 112,566
NBT Bancorp Inc [Member]      
Condensed Income Statements [Abstract]      
Dividends from subsidiaries 77,000 50,200 43,000
Management fee from subsidiaries 4,151 7,981 7,907
Net securities (losses) gains (483) 165 399
Interest, dividends and other income 824 876 905
Total revenue 81,492 59,222 52,211
Operating expenses 11,825 14,262 14,226
Income before income tax expense 69,667 44,960 37,985
Income tax benefit (2,653) (1,588) (1,608)
Equity in undistributed income of subsidiaries 32,068 74,473 72,973
Net income $ 104,388 $ 121,021 $ 112,566