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Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Long-Term Debt by Maturity Periods [Abstract] |  |
Amount | $ 130,945 us-gaap_LongTermDebt | $ 308,823 us-gaap_LongTermDebt
Callable Amount | 80,000 nbtb_LongTermDebtCallablePortion | 220,000 nbtb_LongTermDebtCallablePortion
2013 [Member] |  |
Long-Term Debt by Maturity Periods [Abstract] |  |
Maturity | Dec. 31, 2014 |
Amount | 0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2013Member | 12,460 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2013Member
Weighted Average Rate (in hundredths) | 0.00%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2013Member | 1.33%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2013Member
Callable Amount | 0 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2013Member | 0 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2013Member
Weighted Average Rate Callable Portion (in hundredths) | 0.00%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2013Member | 0.00%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2013Member
2014 [Member] |  |
Long-Term Debt by Maturity Periods [Abstract] |  |
Maturity | Dec. 31, 2015 |
Amount | 217 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2014Member | 308 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2014Member
Weighted Average Rate (in hundredths) | 0.00%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2014Member | 0.00%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2014Member
Callable Amount | 0 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2014Member | 0 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2014Member
Weighted Average Rate Callable Portion (in hundredths) | 0.00%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2014Member | 0.00%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2014Member
2015 [Member] |  |
Long-Term Debt by Maturity Periods [Abstract] |  |
Maturity | Dec. 31, 2016 |
Amount | 50,626 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2015Member | 90,313 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2015Member
Weighted Average Rate (in hundredths) | 2.91%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2015Member | 3.52%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2015Member
Callable Amount | 30,000 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2015Member | 70,000 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2015Member
Weighted Average Rate Callable Portion (in hundredths) | 4.15%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2015Member | 4.21%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2015Member
2016 [Member] |  |
Long-Term Debt by Maturity Periods [Abstract] |  |
Maturity | Dec. 31, 2017 |
Amount | 40,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2016Member | 115,312 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2016Member
Weighted Average Rate (in hundredths) | 2.68%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2016Member | 3.55%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2016Member
Callable Amount | 25,000 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2016Member | 75,000 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2016Member
Weighted Average Rate Callable Portion (in hundredths) | 3.48%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2016Member | 3.73%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2016Member
2017 [Member] |  |
Long-Term Debt by Maturity Periods [Abstract] |  |
Maturity | Dec. 31, 2018 |
Amount | 40,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2017Member | 90,313 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2017Member
Weighted Average Rate (in hundredths) | 2.57%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2017Member | 3.26%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2017Member
Callable Amount | 25,000 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2017Member | 75,000 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2017Member
Weighted Average Rate Callable Portion (in hundredths) | 3.15%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2017Member | 3.61%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2017Member
2018 [Member] |  |
Long-Term Debt by Maturity Periods [Abstract] |  |
Maturity | Dec. 31, 2021 |
Amount | 102 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2018Member | 117 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2018Member
Weighted Average Rate (in hundredths) | 4.00%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2018Member | 4.00%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2018Member
Callable Amount | $ 0 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2018Member | $ 0 nbtb_LongTermDebtCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2018Member
Weighted Average Rate Callable Portion (in hundredths) | 0.00%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2018Member | 0.00%nbtb_WeightedAverageRateCallablePortion / us-gaap_LongtermDebtTypeAxis = nbtb_Maturity2018Member

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- Definition The aggregate carrying amount of long-term borrowings as of the balance sheet date for the callable amount (the portion that the issuer of the debt to repay or convert before the stated maturity date) including current and noncurrent portions. + References No definition available. + Details
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- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of callable amount for long-term debt outstanding by type or by instrument at that time. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Weighted average interest rate of long-term debt outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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