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v3.22.0.1

Parent Company Financial Information, Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Equity securities, at estimated fair value | $ 33,550 | $ 30,737 |  |
Other assets | 266,733 | 293,957 |  |
Total assets | 12,012,111 | 10,932,906 |  |
Liabilities and Stockholders' Equity [Abstract] |  |  |  |
Total liabilities | 10,761,658 | 9,745,288 |  |
Stockholders' equity | 1,250,453 | 1,187,618 | $ 1,120,397 | $ 1,017,909
Total liabilities and stockholders' equity | 12,012,111 | 10,932,906 |  |
NBT Bancorp Inc [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and cash equivalents | 77,182 | 37,915 | $ 9,387 | $ 5,876
Equity securities, at estimated fair value | 27,622 | 25,111 |  |
Investment in subsidiaries, on equity basis | 1,359,613 | 1,345,317 |  |
Other assets | 36,216 | 30,577 |  |
Total assets | 1,500,633 | 1,438,920 |  |
Liabilities and Stockholders' Equity [Abstract] |  |  |  |
Total liabilities | 250,180 | 251,302 |  |
Stockholders' equity | 1,250,453 | 1,187,618 |  |
Total liabilities and stockholders' equity | $ 1,500,633 | $ 1,438,920 |  |

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