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Regulatory Capital Requirements (Tables) | 12 Months Ended
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Dec. 31, 2019
Regulatory Capital Requirements [Abstract] |
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, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier I Capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 963,147 |  |  |  | 10.33 | % |  |  | 4.00 | % |  |  |  |  |  | 5.00 | %
NBT Bank |  |  | 894,407 |  |  |  | 9.64 | % |  |  | 4.00 | % |  |  |  |  |  | 5.00 | %
Common Equity Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 866,147 |  |  |  | 11.29 | % |  |  | 4.50 | % |  |  | 7.000 | % |  |  | 6.50 | %
NBT Bank |  |  | 894,407 |  |  |  | 11.76 | % |  |  | 4.50 | % |  |  | 7.000 | % |  |  | 6.50 | %
Tier I Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 963,147 |  |  |  | 12.56 | % |  |  | 6.00 | % |  |  | 8.500 | % |  |  | 8.00 | %
NBT Bank |  |  | 894,407 |  |  |  | 11.76 | % |  |  | 6.00 | % |  |  | 8.500 | % |  |  | 8.00 | %
Total Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 1,037,041 |  |  |  | 13.52 | % |  |  | 8.00 | % |  |  | 10.500 | % |  |  | 10.00 | %
NBT Bank |  |  | 968,301 |  |  |  | 12.73 | % |  |  | 8.00 | % |  |  | 10.500 | % |  |  | 10.00 | %
As of December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier I Capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 880,448 |  |  |  | 9.52 | % |  |  | 4.00 | % |  |  |  |  |  |  | 5.00 | %
NBT Bank |  |  | 825,863 |  |  |  | 8.98 | % |  |  | 4.00 | % |  |  |  |  |  |  | 5.00 | %
Common Equity Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 783,448 |  |  |  | 10.49 | % |  |  | 4.50 | % |  |  | 6.375 | % |  |  | 6.50 | %
NBT Bank |  |  | 825,863 |  |  |  | 11.14 | % |  |  | 4.50 | % |  |  | 6.375 | % |  |  | 6.50 | %
Tier I Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 880,448 |  |  |  | 11.79 | % |  |  | 6.00 | % |  |  | 7.875 | % |  |  | 8.00 | %
NBT Bank |  |  | 825,863 |  |  |  | 11.14 | % |  |  | 6.00 | % |  |  | 7.875 | % |  |  | 8.00 | %
Total Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  |  | 954,232 |  |  |  | 12.78 | % |  |  | 8.00 | % |  |  | 9.875 | % |  |  | 10.00 | %
NBT Bank |  |  | 899,647 |  |  |  | 12.14 | % |  |  | 8.00 | % |  |  | 9.875 | % |  |  | 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958577-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 + Details
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