Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest, fee, and dividend income
Interest and fees on loans and leases	$ 243,324	$ 238,672	$ 208,458
Securities available for sale	24,464	25,510	27,005
Securities held to maturity	5,261	2,660	2,378
Other	2,032us-gaap_OtherInterestAndDividendIncome	1,881us-gaap_OtherInterestAndDividendIncome	1,556us-gaap_OtherInterestAndDividendIncome
Total interest, fee, and dividend income	275,081	268,723	239,397
Interest expense
Deposits	13,638us-gaap_InterestExpenseDeposits	16,290us-gaap_InterestExpenseDeposits	18,848us-gaap_InterestExpenseDeposits
Short-term borrowings	845	515	188
Long-term debt	6,555us-gaap_InterestExpenseLongTermDebt	11,755us-gaap_InterestExpenseLongTermDebt	14,428us-gaap_InterestExpenseLongTermDebt
Trust preferred debentures	2,165	2,084	1,730
Total interest expense	23,203us-gaap_InterestExpense	30,644us-gaap_InterestExpense	35,194us-gaap_InterestExpense
Net interest income	251,878us-gaap_InterestIncomeExpenseNet	238,079us-gaap_InterestIncomeExpenseNet	204,203us-gaap_InterestIncomeExpenseNet
Provision for loan and lease losses	19,539us-gaap_ProvisionForLoanAndLeaseLosses	22,424us-gaap_ProvisionForLoanAndLeaseLosses	20,269us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan and lease losses	232,339	215,655	183,934
Noninterest income
Insurance and other financial services revenue	24,517us-gaap_InsuranceCommissionsAndFees	24,447us-gaap_InsuranceCommissionsAndFees	22,387us-gaap_InsuranceCommissionsAndFees
Service charges on deposit accounts	17,941nbtb_ServiceChargesOnDepositAccounts	19,307nbtb_ServiceChargesOnDepositAccounts	18,225nbtb_ServiceChargesOnDepositAccounts
ATM and debit card fees	17,135nbtb_AtmFees	15,558nbtb_AtmFees	12,358nbtb_AtmFees
Retirement plan administration fees	12,129nbtb_RetirementPlanAdministrationFees	11,497nbtb_RetirementPlanAdministrationFees	10,097nbtb_RetirementPlanAdministrationFees
Trust	18,950	16,682	9,172
Bank owned life insurance income	5,349us-gaap_BankOwnedLifeInsuranceIncome	3,793us-gaap_BankOwnedLifeInsuranceIncome	3,077us-gaap_BankOwnedLifeInsuranceIncome
Net securities gains	92us-gaap_GainLossOnSaleOfSecuritiesNet	1,426us-gaap_GainLossOnSaleOfSecuritiesNet	599us-gaap_GainLossOnSaleOfSecuritiesNet
Gain on the sale of Springstone investment	19,401us-gaap_GainOnSaleOfInvestments	0us-gaap_GainOnSaleOfInvestments	0us-gaap_GainOnSaleOfInvestments
Other	10,513	10,505	11,412
Total noninterest income	126,027us-gaap_NoninterestIncome	103,215us-gaap_NoninterestIncome	87,327us-gaap_NoninterestIncome
Noninterest expense
Salaries and employee benefits	119,667us-gaap_LaborAndRelatedExpense	113,580us-gaap_LaborAndRelatedExpense	104,815us-gaap_LaborAndRelatedExpense
Occupancy	22,128us-gaap_OccupancyNet	20,720us-gaap_OccupancyNet	17,415us-gaap_OccupancyNet
Data processing and communications	16,137	15,353	13,437
Professional fees and outside services	14,426us-gaap_ProfessionalFees	13,309us-gaap_ProfessionalFees	10,463us-gaap_ProfessionalFees
Equipment	12,658us-gaap_EquipmentExpense	11,493us-gaap_EquipmentExpense	9,627us-gaap_EquipmentExpense
Office supplies and postage	6,983us-gaap_SuppliesAndPostageExpense	6,563us-gaap_SuppliesAndPostageExpense	6,489us-gaap_SuppliesAndPostageExpense
FDIC expenses	4,944	4,960	3,832
Advertising	2,831us-gaap_AdvertisingExpense	3,204us-gaap_AdvertisingExpense	2,889us-gaap_AdvertisingExpense
Amortization of intangible assets	5,047us-gaap_AmortizationOfIntangibleAssets	4,872us-gaap_AmortizationOfIntangibleAssets	3,394us-gaap_AmortizationOfIntangibleAssets
Loan collection and other real estate owned	3,248	2,619	2,560
Merger expenses	0	12,364	2,608
Prepayment penalties on long-term debt	17,902nbtb_PrepaymentPenaltyOnLongTermDebt	0nbtb_PrepaymentPenaltyOnLongTermDebt	0nbtb_PrepaymentPenaltyOnLongTermDebt
Other	20,092us-gaap_OtherNoninterestExpense	19,890us-gaap_OtherNoninterestExpense	16,358us-gaap_OtherNoninterestExpense
Total noninterest expense	246,063us-gaap_NoninterestExpense	228,927us-gaap_NoninterestExpense	193,887us-gaap_NoninterestExpense
Income before income tax expense	112,303	89,943	77,374
Income tax expense	37,229us-gaap_IncomeTaxExpenseBenefit	28,196us-gaap_IncomeTaxExpenseBenefit	22,816us-gaap_IncomeTaxExpenseBenefit
Net income	$ 75,074us-gaap_NetIncomeLoss	$ 61,747us-gaap_NetIncomeLoss	$ 54,558us-gaap_NetIncomeLoss
Earnings per share
Basic (in dollars per share)	$ 1.71us-gaap_EarningsPerShareBasic	$ 1.47us-gaap_EarningsPerShareBasic	$ 1.63us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 1.69us-gaap_EarningsPerShareDiluted	$ 1.46us-gaap_EarningsPerShareDiluted	$ 1.62us-gaap_EarningsPerShareDiluted

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Income from services rendered by trust departments or by any consolidated subsidiaries acting in a fiduciary capacity, including fees earned for (1) acting as an agent for fiduciary placement and loans and (2) custody or investment advisory services when such fees are not separately billed to the customer. This item excludes commissions and fees received for the accumulation or disbursement of funds deposited to Individual Retirement or Keogh plan accounts when such are not handled by the reporting entity's trust department.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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