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v3.20.4

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

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