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Regulatory Capital Requirements (Tables) | 12 Months Ended
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Dec. 31, 2015
Regulatory Capital Requirements [Abstract] |
Schedule of compliance with regulatory compliance requirements under banking regulations | The Company and NBT Bank's actual capital amounts and ratios are presented as follows:
|  | Actual |  |  | Regulatory ratio requirements |
(Dollars in thousands) |  | Amount |  |  | Ratio |  |  | Minimum capital adequacy |  |  | For classification as well capitalized |
As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to risk weighted assets): |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 809,685 |  |  |  | 12.74 | % |  |  | 8.00 | % |  |  | 10.00 | %
NBT Bank |  |  | 724,238 |  |  |  | 11.47 | % |  |  | 8.00 | % |  |  | 10.00 | %
Tier I Capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 745,341 |  |  |  | 11.73 | % |  |  | 4.00 | % |  |  | 6.00 | %
NBT Bank |  |  | 659,894 |  |  |  | 10.45 | % |  |  | 4.00 | % |  |  | 6.00 | %
Tier I Capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 745,341 |  |  |  | 9.44 | % |  |  | 4.00 | % |  |  | 5.00 | %
NBT Bank |  |  | 659,894 |  |  |  | 8.41 | % |  |  | 4.00 | % |  |  | 5.00 | %
Common Equity Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 648,341 |  |  |  | 10.20 | % |  |  | 4.50 | % |  |  | 6.50 | %
NBT Bank |  |  | 659,894 |  |  |  | 10.45 | % |  |  | 4.50 | % |  |  | 6.50 | %
As of December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to risk weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 777,651 |  |  |  | 13.50 | % |  |  | 8.00 | % |  |  | 10.00 | %
NBT Bank |  |  | 727,771 |  |  |  | 12.72 | % |  |  | 8.00 | % |  |  | 10.00 | %
Tier I Capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 709,965 |  |  |  | 12.32 | % |  |  | 4.00 | % |  |  | 6.00 | %
NBT Bank |  |  | 660,086 |  |  |  | 11.54 | % |  |  | 4.00 | % |  |  | 6.00 | %
Tier I Capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 709,965 |  |  |  | 9.39 | % |  |  | 4.00 | % |  |  | 5.00 | %
NBT Bank |  |  | 660,086 |  |  |  | 8.79 | % |  |  | 4.00 | % |  |  | 5.00 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958577-112826 + Details
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