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