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v2.4.1.9

Loans (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net Loans | $ 5,595,271,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | $ 5,406,795,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Deferred loan origination costs, net | 35,600,000 us-gaap_OtherDeferredCostsNet | 31,800,000 us-gaap_OtherDeferredCostsNet
Residential loans held for sale | 3,200,000 us-gaap_LoansHeldForSaleMortgages | 100,000 us-gaap_LoansHeldForSaleMortgages
Loans and Leases Receivable, Related Parties [Roll Forward] |  |
Balance at January 1 | 3,372,000 us-gaap_LoansAndLeasesReceivableRelatedParties | 2,790,000 us-gaap_LoansAndLeasesReceivableRelatedParties
New loans | 522,000 us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions | 569,000 us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
Adjustment due to change in composition of related parties | 253,000 nbtb_LoansAndLeasesReceivableRelatedPartiesCompositionPeriodIncreaseDecrease | 376,000 nbtb_LoansAndLeasesReceivableRelatedPartiesCompositionPeriodIncreaseDecrease
Repayments | (571,000)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections | (363,000)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
Balance at December 31 | 3,576,000 us-gaap_LoansAndLeasesReceivableRelatedParties | 3,372,000 us-gaap_LoansAndLeasesReceivableRelatedParties
Residential Real Estate Mortgages [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net Loans | 1,115,589,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ResidentialPortfolioSegmentMember | 1,041,637,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ResidentialPortfolioSegmentMember
Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net Loans | 839,770,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialPortfolioSegmentMember | 859,026,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net Loans | 1,442,989,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateMember | 1,328,313,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateMember
Real Estate Construction and Development [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net Loans | 83,750,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember | 93,247,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Agricultural and Agricultural Real Estate Mortgages [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net Loans | 107,195,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = nbtb_AgriculturalAndAgriculturalRealEstateMortgagesMember | 112,035,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = nbtb_AgriculturalAndAgriculturalRealEstateMortgagesMember
Loans serviced | 23,400,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = nbtb_AgriculturalAndAgriculturalRealEstateMortgagesMember | 15,700,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = nbtb_AgriculturalAndAgriculturalRealEstateMortgagesMember
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net Loans | 1,436,382,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember | 1,352,638,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember
Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net Loans | $ 569,596,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = nbtb_HomeEquityLoanMember | $ 619,899,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = nbtb_HomeEquityLoanMember

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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- Definition Reflects the amount of new advances made to related parties in the form of loan and lease receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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- Definition Reflects the amount of collections received from related parties to reduce the carrying amounts of loans and leases receivable due from them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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- Definition Amount classified as mortgage loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6490309&loc=d3e48678-111004 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Permanent Investor -URI http://asc.fasb.org/extlink&oid=6520390 + Details
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