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Parent Company Financial Information, Condensed Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
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