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Regulatory Capital Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Tier I Capital (to average assets) [Abstract] |  |
Tier I capital to average assets | $ 810,445 | $ 773,111
Tier I capital to average assets ratio | 9.14% | 9.11%
Minimum Tier I leverage capital required for capital adequacy to average assets | 4.00% | 4.00%
Tier I leverage capital required for classification as well capitalized to average assets | 5.00% | 5.00%
Common Equity Tier I Capital [Abstract] |  |
Common equity Tier I capital | $ 713,445 | $ 676,111
Common equity Tier I capital ratio | 10.06% | 9.98%
Minimum Tier I capital required for capital adequacy | 4.50% | 4.50%
Minimum Tier I capital required for capital adequacy plus buffer | 5.75% | 5.125%
Tier I capital required for classification as well capitalized | 6.50% | 6.50%
Tier I Capital (to risk weighted assets) [Abstract] |  |
Tier I capital to risk weighted assets | $ 810,445 | $ 773,111
Tier I capital to risk weighted assets ratio | 11.42% | 11.42%
Minimum Tier I capital required for capital adequacy to risk weighted assets | 6.00% | 6.00%
Minimum Tier I capital required for capital adequacy plus buffer to risk weighted assets | 7.25% | 6.625%
Tier I capital required for classification as well capitalized to risk weighted assets | 6.00% | 8.00%
Total Capital (to risk weighted assets) [Abstract] |  |
Total capital to risk weighted assets | $ 880,874 | $ 839,152
Total capital to risk weighted assets ratio | 12.42% | 12.39%
Minimum capital required for capital adequacy to risk weighted assets | 8.00% | 8.00%
Total capital required for capital adequacy plus buffer to average assets | 9.25% | 8.625%
Capital required for classification as well capitalized to risk weighted assets | 10.00% | 10.00%
NBT Bank [Member] |  |
Tier I Capital (to average assets) [Abstract] |  |
Tier I capital to average assets | $ 756,521 | $ 723,992
Tier I capital to average assets ratio | 8.59% | 8.59%
Minimum Tier I leverage capital required for capital adequacy to average assets | 4.00% | 4.00%
Tier I leverage capital required for classification as well capitalized to average assets | 5.00% | 5.00%
Common Equity Tier I Capital [Abstract] |  |
Common equity Tier I capital | $ 756,521 | $ 723,992
Common equity Tier I capital ratio | 10.74% | 10.76%
Minimum Tier I capital required for capital adequacy | 4.50% | 4.50%
Minimum Tier I capital required for capital adequacy plus buffer | 5.75% | 5.125%
Tier I capital required for classification as well capitalized | 6.50% | 6.50%
Tier I Capital (to risk weighted assets) [Abstract] |  |
Tier I capital to risk weighted assets | $ 756,521 | $ 723,992
Tier I capital to risk weighted assets ratio | 10.74% | 10.76%
Minimum Tier I capital required for capital adequacy to risk weighted assets | 6.00% | 6.00%
Minimum Tier I capital required for capital adequacy plus buffer to risk weighted assets | 7.25% | 6.625%
Tier I capital required for classification as well capitalized to risk weighted assets | 6.00% | 8.00%
Total Capital (to risk weighted assets) [Abstract] |  |
Total capital to risk weighted assets | $ 826,950 | $ 790,034
Total capital to risk weighted assets ratio | 11.74% | 11.75%
Minimum capital required for capital adequacy to risk weighted assets | 8.00% | 8.00%
Total capital required for capital adequacy plus buffer to average assets | 9.25% | 8.625%
Capital required for classification as well capitalized to risk weighted assets | 10.00% | 10.00%

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- Definition The minimum Common Equity Tier 1 Capital ratio (Common Equity Tier 1 Capital divided by Risk-based Assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The minimum Common Equity Tier 1 Capital ratio (Common Equity Tier 1 Capital divided by Risk-based Assets) required for capital adequacy plus buffer purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy plus buffer purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: 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 2: 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 3: 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 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: 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 2: 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 + Details
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