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Parent Company Financial Information, Condensed Income Statements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Income Statements [Abstract] |  |  |
Net securities gains | $ 4,213 | $ (6,341) | $ 1,867
Interest, dividends and other income | 367,534 | 344,255 | 309,407
Income before income tax benefit and equity in undistributed income of subsidiaries | 155,432 | 137,002 | 128,161
Income tax expense (benefit) | 34,411 | 24,436 | 46,010
Net income | 121,021 | 112,566 | 82,151
NBT Bancorp Inc [Member] |  |  |
Condensed Income Statements [Abstract] |  |  |
Dividends from subsidiaries | 50,200 | 43,000 | 38,300
Management fee from subsidiaries | 7,981 | 7,907 | 99,319
Net securities gains | 165 | 399 | 2,237
Interest, dividends and other income | 876 | 905 | 928
Total revenue | 59,222 | 52,211 | 140,784
Operating expenses | 14,262 | 14,226 | 100,667
Income before income tax benefit and equity in undistributed income of subsidiaries | 44,960 | 37,985 | 40,117
Income tax expense (benefit) | (1,588) | (1,608) | 2,233
Dividends in excess of income (equity in undistributed income) of subsidiaries | 74,473 | 72,973 | 44,267
Net income | $ 121,021 | $ 112,566 | $ 82,151

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