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Parent Company Financial Information, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating activities [Abstract] |  |  |
Net income | $ 140,641 | $ 118,782 | $ 151,995
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation and amortization of premises and equipment | 11,525 | 10,695 | 10,155
Excess tax benefit on stock-based compensation | (295) | (296) | (288)
Stock-based compensation expense | 5,992 | 5,102 | 4,530
Net securities (gains) losses | (2,789) | 9,315 | 1,131
Bank owned life insurance income | (8,325) | (6,750) | (6,044)
Amortization of subordinated debt issuance costs | 437 | 437 | 437
Discount on repurchase of subordinated debt | 0 | 0 | (106)
Net change in other assets and other liabilities | 748 | (27,907) | 11,932
Net cash provided by operating activities | 188,567 | 157,457 | 183,223
Investing activities [Abstract] |  |  |
Net cash provided by acquisitions | (1,383) | 44,564 | (2,616)
Net cash used in investing activities | (399,160) | (44,226) | (926,216)
Financing activities [Abstract] |  |  |
Repurchase of subordinated debt | 0 | 0 | (2,000)
Proceeds from the issuance of shares to employee and other stock plans | 61 | 91 | 0
Cash paid by employer for tax-withholding on stock issuance | (1,993) | (1,877) | (1,751)
Purchases of treasury shares | (251) | (4,944) | (14,713)
Cash dividends | (62,263) | (55,886) | (49,765)
Net cash provided (used in) by financing activities | 289,460 | (105,392) | (328,728)
Net increase (decrease) in cash and cash equivalents | 78,867 | 7,839 | (1,071,721)
NBT Bancorp Inc [Member] |  |  |
Operating activities [Abstract] |  |  |
Net income | 140,641 | 118,782 | 151,995
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation and amortization of premises and equipment | 336 | 353 | 582
Excess tax benefit on stock-based compensation | (295) | (296) | (288)
Stock-based compensation expense | 5,992 | 5,102 | 4,530
Net securities (gains) losses | (575) | 82 | 618
Equity in undistributed income of subsidiaries | (54,724) | (13,950) | (41,978)
Bank owned life insurance income | (281) | (271) | (238)
Amortization of subordinated debt issuance costs | 437 | 437 | 437
Discount on repurchase of subordinated debt | 0 | 0 | (106)
Net change in other assets and other liabilities | (3,998) | (4,930) | (8,376)
Net cash provided by operating activities | 87,533 | 105,309 | 107,176
Investing activities [Abstract] |  |  |
Net cash provided by acquisitions | 0 | 3,542 | 0
Net cash used in investing activities | 0 | 3,542 | 0
Financing activities [Abstract] |  |  |
Repurchase of subordinated debt | 0 | 0 | (2,000)
Proceeds from the issuance of shares to employee and other stock plans | 61 | 91 | 0
Cash paid by employer for tax-withholding on stock issuance | (1,993) | (1,877) | (1,751)
Purchases of treasury shares | (251) | (4,944) | (14,713)
Cash dividends | (62,263) | (55,886) | (49,765)
Net cash provided (used in) by financing activities | (64,446) | (62,616) | (68,229)
Net increase (decrease) in cash and cash equivalents | 23,087 | 46,235 | 38,947
Cash and cash equivalents at beginning of year | 162,364 | 116,129 | 77,182
Cash and cash equivalents at end of year | $ 185,451 | $ 162,364 | $ 116,129

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