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Regulatory Capital Requirements (Tables) | 12 Months Ended
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Dec. 31, 2017
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 |  |  | Minimum plus Buffer |  |  | For Classification as Well- Capitalized |
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier I Capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 810,445 |  |  |  | 9.14 | % |  |  | 4.00 | % |  |  |  |  |  | 5.00 | %
NBT Bank |  |  | 756,521 |  |  |  | 8.59 | % |  |  | 4.00 | % |  |  |  |  |  | 5.00 | %
Common Equity Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 713,445 |  |  |  | 10.06 | % |  |  | 4.50 | % |  |  | 5.75 | % |  |  | 6.50 | %
NBT Bank |  |  | 756,521 |  |  |  | 10.74 | % |  |  | 4.50 | % |  |  | 5.75 | % |  |  | 6.50 | %
Tier I Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 810,445 |  |  |  | 11.42 | % |  |  | 6.00 | % |  |  | 7.25 | % |  |  | 6.00 | %
NBT Bank |  |  | 756,521 |  |  |  | 10.74 | % |  |  | 6.00 | % |  |  | 7.25 | % |  |  | 6.00 | %
Total Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 880,874 |  |  |  | 12.42 | % |  |  | 8.00 | % |  |  | 9.25 | % |  |  | 10.00 | %
NBT Bank |  |  | 826,950 |  |  |  | 11.74 | % |  |  | 8.00 | % |  |  | 9.25 | % |  |  | 10.00 | %
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier I Capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 773,111 |  |  |  | 9.11 | % |  |  | 4.00 | % |  |  |  |  |  |  | 5.00 | %
NBT Bank |  |  | 723,992 |  |  |  | 8.59 | % |  |  | 4.00 | % |  |  |  |  |  |  | 5.00 | %
Common Equity Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 676,111 |  |  |  | 9.98 | % |  |  | 4.50 | % |  |  | 5.125 | % |  |  | 6.50 | %
NBT Bank |  |  | 723,992 |  |  |  | 10.76 | % |  |  | 4.50 | % |  |  | 5.125 | % |  |  | 6.50 | %
Tier I Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 773,111 |  |  |  | 11.42 | % |  |  | 6.00 | % |  |  | 6.625 | % |  |  | 8.00 | %
NBT Bank |  |  | 723,992 |  |  |  | 10.76 | % |  |  | 6.00 | % |  |  | 6.625 | % |  |  | 8.00 | %
Total Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 839,152 |  |  |  | 12.39 | % |  |  | 8.00 | % |  |  | 8.625 | % |  |  | 10.00 | %
NBT Bank |  |  | 790,034 |  |  |  | 11.75 | % |  |  | 8.00 | % |  |  | 8.625 | % |  |  | 10.00 | %

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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=84167132&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=84167132&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=84167132&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=84167132&loc=SL5958577-112826 + Details
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