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Parent Company Financial Information, Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating activities [Abstract] |  |  |
Net income | $ 82,151 | $ 78,409 | $ 76,425
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation and amortization of premises and equipment | 9,056 | 9,023 | 8,646
Excess tax benefit on stock-based compensation | 1,769 | 1,055 | (43)
Stock-based compensation expense | 3,644 | 4,378 | 4,086
Net (gain) on sales of AFS securities | (1,869) | 644 | (3,087)
Re-evaluation of deferred tax amounts from Tax Act | 4,407 | 0 | 0
Bank owned life insurance income | (5,175) | (5,195) | (4,334)
Net change in other liabilities | 3,834 | (10,697) | 5,236
Net change in other assets | 28 | 364 | 15,386
Net cash provided by operating activities | 136,904 | 110,565 | 124,500
Investing activities [Abstract] |  |  |
Proceeds on sales and maturities of AFS securities | 290,613 | 324,781 | 299,302
Purchases of AFS securities | (233,804) | (597,428) | (481,262)
Proceeds from settlement of bank owned life insurance | 799 | 1,477 | 1,541
Net purchases of premises and equipment | (6,691) | (3,308) | (8,193)
Net cash provided by (used in) investing activities | (305,193) | (629,960) | (504,004)
Financing activities [Abstract] |  |  |
Proceeds from the issuance of shares to employee benefit plans and other stock plans | 3,309 | 6,032 | 9,356
Cash paid by employer for tax-withholding on stock issuance | (3,582) | (3,387) | (1,664)
Purchases of treasury shares | 0 | (17,193) | (26,797)
Cash dividends and payments for fractional shares | (40,104) | (38,880) | (38,149)
Net cash provided by (used in) financing activities | 178,772 | 528,279 | 373,165
Net increase (decrease) in cash and cash equivalents | 10,483 | 8,884 | (6,339)
Cash and cash equivalents at beginning of year | 149,181 | 140,297 | 146,636
Cash and cash equivalents at end of year | 159,664 | 149,181 | 140,297
NBT Bancorp Inc [Member] |  |  |
Operating activities [Abstract] |  |  |
Net income | 82,151 | 78,409 | 76,425
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation and amortization of premises and equipment | 2,974 | 2,805 | 2,522
Excess tax benefit on stock-based compensation | 1,769 | 1,055 | (43)
Stock-based compensation expense | 3,644 | 4,378 | 4,086
Net (gain) on sales of AFS securities | (2,238) | (652) | (3,034)
Re-evaluation of deferred tax amounts from Tax Act | 3,339 | 0 | 0
Equity in undistributed income of subsidiaries | (82,567) | (79,193) | (74,916)
Cash dividend from subsidiaries | 38,300 | 10,200 | 78,200
Bank owned life insurance income | (328) | (356) | (292)
Net change in other liabilities | (5,624) | (8,596) | 6,770
Net change in other assets | (368) | 22,728 | (6,652)
Net cash provided by operating activities | 41,052 | 30,778 | 83,066
Investing activities [Abstract] |  |  |
Proceeds on sales and maturities of AFS securities | 4,710 | 1,783 | 5,297
Purchases of AFS securities | (9) | (580) | (3,083)
Proceeds from settlement of bank owned life insurance | 308 | 0 | 0
Net purchases of premises and equipment | (2,264) | (3,083) | (2,930)
Net cash provided by (used in) investing activities | 2,745 | (1,880) | (716)
Financing activities [Abstract] |  |  |
Proceeds from the issuance of shares to employee benefit plans and other stock plans | 3,309 | 6,032 | 8,856
Cash paid by employer for tax-withholding on stock issuance | (3,582) | (3,387) | (1,164)
Purchases of treasury shares | 0 | (17,193) | (26,797)
Cash dividends and payments for fractional shares | (40,104) | (38,880) | (38,149)
Net cash provided by (used in) financing activities | (40,377) | (53,428) | (57,254)
Net increase (decrease) in cash and cash equivalents | 3,420 | (24,530) | 25,096
Cash and cash equivalents at beginning of year | 4,152 | 28,682 | 3,586
Cash and cash equivalents at end of year | $ 7,572 | $ 4,152 | $ 28,682

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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