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v3.3.1.900

Parent Company Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Assets [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents | $ 146,636 | $ 146,636 | $ 158,926 | $ 140,297 | $ 146,636 | $ 158,926 | $ 163,668
Securities available for sale, at estimated fair value |  |  |  | 1,174,544 | 1,013,171 |  |
Trading securities |  |  |  | 8,377 | 7,793 |  |
Other assets |  |  |  | 122,517 | 136,381 |  |
Total assets |  |  |  | 8,262,646 | 7,807,340 |  |
Liabilities and Stockholders' Equity [Abstract] |  |  |  |  |  |  |
Total liabilities |  |  |  | 7,380,642 | 6,943,159 |  |
Stockholders' equity |  |  |  | 882,004 | 864,181 | 816,569 | 582,273
Total liabilities and stockholders' equity |  |  |  | 8,262,646 | 7,807,340 |  |
Condensed Income Statements [Abstract] |  |  |  |  |  |  |
Securities gains | 3,087 | 92 | 1,426 |  |  |  |
Interest, dividend and other income | 273,224 | 275,081 | 268,723 |  |  |  |
Income before income tax benefit and equity in undistributed income of subsidiaries | 116,628 | 112,303 | 89,943 |  |  |  |
Income tax benefit (expense) | (40,203) | (37,229) | (28,196) |  |  |  |
Net income | 76,425 | 75,074 | 61,747 |  |  |  |
Operating activities [Abstract] |  |  |  |  |  |  |
Net income | 76,425 | 75,074 | 61,747 |  |  |  |
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |  |  |  |  |
Stock-based compensation | 4,086 | 3,521 | 4,305 |  |  |  |
Gains (losses) on sales of available-for-sale securities | (3,034) | (49) | (1,283) |  |  |  |
Net change in other liabilities | 5,236 | 5,286 | (5,219) |  |  |  |
Net change in other assets | 15,386 | (19,601) | 22,807 |  |  |  |
Net cash provided by operating activities | 124,543 | 87,811 | 119,298 |  |  |  |
Investing activities [Abstract] |  |  |  |  |  |  |
Purchases of available-for-sale securities | (481,262) | (197,652) | (353,714) |  |  |  |
Sales and maturities of available-for-sale securities | 299,302 | 236,133 | 376,509 |  |  |  |
Purchases of premises and equipment | (8,193) | (9,003) | (5,766) |  |  |  |
Net cash used in investing activities | (504,004) | (143,741) | (183,754) |  |  |  |
Financing activities [Abstract] |  |  |  |  |  |  |
Payments on long-term debt | (498) | (315,831) | (163,595) |  |  |  |
Purchases of treasury shares | (26,797) | (72) | (12,459) |  |  |  |
Cash dividends and payments for fractional shares | (38,149) | (36,905) | (33,518) |  |  |  |
Net cash provided by financing activities | 373,122 | 43,640 | 59,714 |  |  |  |
Net (decrease) increase in cash and cash equivalents | (6,339) | (12,290) | (4,742) |  |  |  |
Cash and cash equivalents at beginning of year | 146,636 | 158,926 | 163,668 |  |  |  |
Cash and cash equivalents at end of year | 140,297 | 146,636 | 158,926 |  |  |  |
NBT Bancorp Inc [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents | 28,682 | 3,586 | 3,741 | 28,682 | 3,586 | $ 3,741 | $ 23,095
Securities available for sale, at estimated fair value |  |  |  | 12,711 | 11,649 |  |
Trading securities |  |  |  | 8,042 | 6,761 |  |
Investment in subsidiaries, on equity basis |  |  |  | 941,731 | 947,880 |  |
Other assets |  |  |  | 65,133 | 61,829 |  |
Total assets |  |  |  | 1,056,299 | 1,031,705 |  |
Liabilities and Stockholders' Equity [Abstract] |  |  |  |  |  |  |
Total liabilities |  |  |  | 174,295 | 167,524 |  |
Stockholders' equity |  |  |  | 882,004 | 864,181 |  |
Total liabilities and stockholders' equity |  |  |  | $ 1,056,299 | $ 1,031,705 |  |
Condensed Income Statements [Abstract] |  |  |  |  |  |  |
Dividends from subsidiaries | 78,200 | 35,400 | 13,500 |  |  |  |
Management fee from subsidiaries | 92,629 | 87,116 | 84,778 |  |  |  |
Securities gains | 3,034 | 49 | 1,273 |  |  |  |
Interest, dividend and other income | 693 | 800 | 636 |  |  |  |
Total revenue | 174,556 | 123,365 | 100,187 |  |  |  |
Operating expense | 94,332 | 89,834 | 83,679 |  |  |  |
Income before income tax benefit and equity in undistributed income of subsidiaries | 80,224 | 33,531 | 16,508 |  |  |  |
Income tax benefit (expense) | (515) | 631 | (1,046) |  |  |  |
Dividends in excess of income (equity in undistributed income) of subsidiaries | (3,284) | 40,912 | 46,285 |  |  |  |
Net income | 76,425 | 75,074 | 61,747 |  |  |  |
Operating activities [Abstract] |  |  |  |  |  |  |
Net income | 76,425 | 75,074 | 61,747 |  |  |  |
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |  |  |  |  |
Stock-based compensation | 4,086 | 3,521 | 4,305 |  |  |  |
Gains (losses) on sales of available-for-sale securities | (3,034) | 49 | 1,273 |  |  |  |
Equity in undistributed income of subsidiaries | 2,967 | (75,824) | (59,785) |  |  |  |
Cash dividend from subsidiaries | 0 | 35,400 | 13,500 |  |  |  |
Net change in other liabilities | 6,770 | 18,594 | (18,077) |  |  |  |
Net change in other assets | (6,627) | (25,151) | 14,928 |  |  |  |
Net cash provided by operating activities | 80,587 | 31,663 | 17,891 |  |  |  |
Investing activities [Abstract] |  |  |  |  |  |  |
Purchases of available-for-sale securities | (3,083) | (597) | 0 |  |  |  |
Sales and maturities of available-for-sale securities | 5,297 | 140 | 1,948 |  |  |  |
Net cash provided by acquisitions | 0 | 0 | 2,232 |  |  |  |
Purchases of premises and equipment | (408) | (640) | (782) |  |  |  |
Net cash used in investing activities | 1,806 | (1,097) | 3,398 |  |  |  |
Financing activities [Abstract] |  |  |  |  |  |  |
Proceeds from the issuance of shares to employee benefit plans and other stock plans | 7,692 | 5,943 | 5,512 |  |  |  |
Purchases of treasury shares | (26,797) | (72) | (12,459) |  |  |  |
Cash dividends and payments for fractional shares | (38,149) | (36,905) | (33,518) |  |  |  |
Excess tax benefit from exercise of stock options | (43) | 313 | (178) |  |  |  |
Net cash provided by financing activities | (57,297) | (30,721) | (40,643) |  |  |  |
Net (decrease) increase in cash and cash equivalents | 25,096 | (155) | (19,354) |  |  |  |
Cash and cash equivalents at beginning of year | 3,586 | 3,741 | 23,095 |  |  |  |
Cash and cash equivalents at end of year | $ 28,682 | $ 3,586 | $ 3,741 |  |  |  |

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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3574-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the capital received in cash from a partner in a partnership during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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