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v3.19.3.a.u2

Parent Company Financial Information, Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities [Abstract] |  |  |
Net income | $ 121,021 | $ 112,566 | $ 82,151
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation and amortization of premises and equipment | 9,497 | 9,280 | 9,056
Excess tax benefit on stock-based compensation | (409) | (543) | (1,769)
Stock-based compensation expense | 4,210 | 3,936 | 3,644
Net security (gains) losses | (4,213) | 6,341 | (1,867)
Re-evaluation of deferred tax amounts from Tax Act | 0 | 0 | 4,407
Bank owned life insurance income | (5,355) | (5,091) | (5,175)
Net change in other assets and other liabilities | (4,902) | (9,554) | 7,400
Net cash provided by operating activities | 153,463 | 147,773 | 136,904
Investing activities [Abstract] |  |  |
Proceeds on sales of equity securities | 3,966 | 3,318 | 0
Purchases of equity securities | (93) | (2) | 0
Proceeds on sales and maturities of AFS securities | 273,578 | 259,446 | 290,613
Purchases of AFS securities | (252,963) | (132,448) | (233,804)
Proceeds from settlement of bank owned life insurance | 1,086 | 0 | 799
Net purchases of premises and equipment | (6,647) | (7,402) | (6,691)
Net cash (used in) provided by investing activities | (64,343) | (417,619) | (305,193)
Financing activities [Abstract] |  |  |
Proceeds from the issuance of shares to employee and other stock plans | 725 | 1,296 | 3,309
Cash paid by employer for tax-withholdings on stock issuance | (1,622) | (1,893) | (3,582)
Cash dividends | (46,010) | (43,269) | (40,104)
Net cash (used in) provided by financing activities | (53,232) | 291,137 | 178,772
Net increase (decrease) in cash and cash equivalents | 35,888 | 21,291 | 10,483
Cash and cash equivalents at beginning of year | 180,955 | 159,664 | 149,181
Cash and cash equivalents at end of year | 216,843 | 180,955 | 159,664
NBT Bancorp Inc [Member] |  |  |
Operating activities [Abstract] |  |  |
Net income | 121,021 | 112,566 | 82,151
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation and amortization of premises and equipment | 2,298 | 2,814 | 2,974
Excess tax benefit on stock-based compensation | (409) | (543) | (1,769)
Stock-based compensation expense | 4,210 | 3,936 | 3,644
Net security (gains) losses | (165) | (399) | (2,238)
Re-evaluation of deferred tax amounts from Tax Act | 0 | 0 | 3,339
Equity in undistributed income of subsidiaries | (124,673) | (115,972) | (82,567)
Cash dividend from subsidiaries | 50,200 | 43,000 | 38,300
Bank owned life insurance income | (398) | (424) | (328)
Net change in other assets and other liabilities | (1,573) | (6,124) | (2,454)
Net cash provided by operating activities | 50,511 | 38,854 | 41,052
Investing activities [Abstract] |  |  |
Proceeds on sales of equity securities | 0 | 3,318 | 0
Purchases of equity securities | (93) | (2) | 0
Proceeds on sales and maturities of AFS securities | 0 | 0 | 4,710
Purchases of AFS securities | 0 | 0 | (9)
Proceeds from settlement of bank owned life insurance | 0 | 0 | 308
Net purchases of premises and equipment | 0 | 0 | (2,264)
Net cash (used in) provided by investing activities | (93) | 3,316 | 2,745
Financing activities [Abstract] |  |  |
Proceeds from the issuance of shares to employee and other stock plans | 725 | 1,296 | 3,309
Cash paid by employer for tax-withholdings on stock issuance | (1,622) | (1,893) | (3,582)
Cash dividends | (46,010) | (43,269) | (40,104)
Net cash (used in) provided by financing activities | (46,907) | (43,866) | (40,377)
Net increase (decrease) in cash and cash equivalents | 3,511 | (1,696) | 3,420
Cash and cash equivalents at beginning of year | 5,876 | 7,572 | 4,152
Cash and cash equivalents at end of year | $ 9,387 | $ 5,876 | $ 7,572

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