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Parent Company Financial Information, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating activities [Abstract] |  |  |
Net income | $ 154,885 | $ 104,388 | $ 121,021
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation and amortization of premises and equipment | 9,896 | 9,772 | 9,497
Excess tax benefit on stock-based compensation | (385) | (181) | (409)
Stock-based compensation expense | 4,414 | 4,581 | 4,210
Net securities (gains) losses | (566) | 388 | (4,213)
Bank owned life insurance income | (6,217) | (5,743) | (5,355)
Amortization of subordinated debt issuance costs | 438 | 230 | 0
Net change in other assets and other liabilities | (12,667) | (49,930) | (6,774)
Net cash provided by operating activities | 157,635 | 142,412 | 153,463
Investing activities [Abstract] |  |  |
Purchases of equity securities | 0 | 0 | (93)
Net cash provided by (used in) investing activities | (546,058) | (709,725) | (64,343)
Financing activities [Abstract] |  |  |
Proceeds from issuance of subordinated debt | 0 | 100,000 | 0
Payment of subordinated debt issuance costs | 0 | (2,178) | 0
Proceeds from the issuance of shares to employee and other stock plans | 112 | 184 | 725
Cash paid by employer for tax-withholding on stock issuance | (2,931) | (1,537) | (1,622)
Purchases of treasury shares | (21,714) | (7,980) | 0
Cash dividends | (47,738) | (47,207) | (46,010)
Net cash provided by (used in) financing activities | 984,813 | 1,023,151 | (53,232)
Net increase in cash and cash equivalents | 596,390 | 455,838 | 35,888
NBT Bancorp Inc [Member] |  |  |
Operating activities [Abstract] |  |  |
Net income | 154,885 | 104,388 | 121,021
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation and amortization of premises and equipment | 1,113 | 1,739 | 2,298
Excess tax benefit on stock-based compensation | (385) | (181) | (409)
Stock-based compensation expense | 4,414 | 4,581 | 4,210
Net securities (gains) losses | (543) | 483 | (165)
Equity in undistributed income of subsidiaries | (41,931) | (32,068) | (74,473)
Bank owned life insurance income | (326) | (391) | (398)
Amortization of subordinated debt issuance costs | 438 | 230 | 0
Net change in other assets and other liabilities | (7,127) | (3,535) | (1,573)
Net cash provided by operating activities | 110,538 | 75,246 | 50,511
Investing activities [Abstract] |  |  |
Investment in the Bank | 0 | (90,000) | 0
Proceeds from calls of equity securities | 1,000 | 2,000 | 0
Purchases of equity securities | 0 | 0 | (93)
Net cash provided by (used in) investing activities | 1,000 | (88,000) | (93)
Financing activities [Abstract] |  |  |
Proceeds from issuance of subordinated debt | 0 | 100,000 | 0
Payment of subordinated debt issuance costs | 0 | (2,178) | 0
Proceeds from the issuance of shares to employee and other stock plans | 112 | 184 | 725
Cash paid by employer for tax-withholding on stock issuance | (2,931) | (1,537) | (1,622)
Purchases of treasury shares | (21,714) | (7,980) | 0
Cash dividends | (47,738) | (47,207) | (46,010)
Net cash provided by (used in) financing activities | (72,271) | 41,282 | (46,907)
Net increase in cash and cash equivalents | 39,267 | 28,528 | 3,511
Cash and cash equivalents at beginning of year | 37,915 | 9,387 | 5,876
Cash and cash equivalents at end of year | $ 77,182 | $ 37,915 | $ 9,387

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