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Parent Company Financial Information, Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Cash and cash equivalents | $ 159,664 | $ 149,181 | $ 140,297 | $ 146,636
Securities available for sale, at fair value | 1,255,925 | 1,338,290 |  |
Trading securities | 11,467 | 9,259 |  |
Other assets | 128,548 | 129,247 |  |
Total assets | 9,136,812 | 8,867,268 |  |
Liabilities and Stockholders' Equity [Abstract] |  |  |  |
Total liabilities | 8,178,635 | 7,953,952 |  |
Stockholders' equity | 958,177 | 913,316 | 882,004 | 864,181
Total liabilities and stockholders' equity | 9,136,812 | 8,867,268 |  |
NBT Bancorp Inc [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and cash equivalents | 7,572 | 4,152 | $ 28,682 | $ 3,586
Securities available for sale, at fair value | 10,065 | 15,273 |  |
Trading securities | 11,245 | 8,968 |  |
Investment in subsidiaries, on equity basis | 1,048,908 | 1,006,444 |  |
Other assets | 40,461 | 44,178 |  |
Total assets | 1,118,251 | 1,079,015 |  |
Liabilities and Stockholders' Equity [Abstract] |  |  |  |
Total liabilities | 160,074 | 165,699 |  |
Stockholders' equity | 958,177 | 913,316 |  |
Total liabilities and stockholders' equity | $ 1,118,251 | $ 1,079,015 |  |

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