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Consolidated Statements of Income (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest, fee, and dividend income
Interest and fees on loans	$ 59,518us-gaap_InterestAndFeeIncomeLoansAndLeases	$ 60,015us-gaap_InterestAndFeeIncomeLoansAndLeases
Securities available for sale	4,945us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale	6,757us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale
Securities held to maturity	2,283us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity	768us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity
Other	480us-gaap_OtherInterestAndDividendIncome	537us-gaap_OtherInterestAndDividendIncome
Total interest, fee, and dividend income	67,226us-gaap_InterestAndDividendIncomeOperating	68,077us-gaap_InterestAndDividendIncomeOperating
Interest expense
Deposits	3,573us-gaap_InterestExpenseDeposits	3,284us-gaap_InterestExpenseDeposits
Short-term borrowings	121us-gaap_InterestExpenseShortTermBorrowings	231us-gaap_InterestExpenseShortTermBorrowings
Long-term debt	826us-gaap_InterestExpenseLongTermDebt	2,507us-gaap_InterestExpenseLongTermDebt
Junior subordinated debt	540us-gaap_InterestExpenseJuniorSubordinatedDebentures	538us-gaap_InterestExpenseJuniorSubordinatedDebentures
Total interest expense	5,060us-gaap_InterestExpense	6,560us-gaap_InterestExpense
Net interest income	62,166us-gaap_InterestIncomeExpenseNet	61,517us-gaap_InterestIncomeExpenseNet
Provision for loan losses	3,642us-gaap_ProvisionForLoanAndLeaseLosses	3,596us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses	58,524us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	57,921us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Noninterest income
Insurance and other financial services revenue	6,374us-gaap_InsuranceCommissionsAndFees	6,737us-gaap_InsuranceCommissionsAndFees
Service charges on deposit accounts	4,072nbtb_ServiceChargesOnDepositAccounts	4,369nbtb_ServiceChargesOnDepositAccounts
ATM and debit card fees	4,248nbtb_AtmFees	4,072nbtb_AtmFees
Retirement plan administration fees	3,196nbtb_RetirementPlanAdministrationFees	2,918nbtb_RetirementPlanAdministrationFees
Trust	4,450us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities	4,446us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities
Bank owned life insurance	1,559us-gaap_BankOwnedLifeInsuranceIncome	1,382us-gaap_BankOwnedLifeInsuranceIncome
Net securities gains	14us-gaap_GainLossOnSaleOfSecuritiesNet	7us-gaap_GainLossOnSaleOfSecuritiesNet
Other	2,621us-gaap_NoninterestIncomeOtherOperatingIncome	2,346us-gaap_NoninterestIncomeOtherOperatingIncome
Total noninterest income	26,534us-gaap_NoninterestIncome	26,277us-gaap_NoninterestIncome
Noninterest expense
Salaries and employee benefits	30,182us-gaap_LaborAndRelatedExpense	29,534us-gaap_LaborAndRelatedExpense
Occupancy	6,066us-gaap_OccupancyNet	6,226us-gaap_OccupancyNet
Data processing and communications	4,103us-gaap_CommunicationsAndInformationTechnology	4,001us-gaap_CommunicationsAndInformationTechnology
Professional fees and outside services	3,497us-gaap_ProfessionalFees	3,415us-gaap_ProfessionalFees
Equipment	3,249us-gaap_EquipmentExpense	3,116us-gaap_EquipmentExpense
Office supplies and postage	1,619us-gaap_SuppliesAndPostageExpense	1,685us-gaap_SuppliesAndPostageExpense
FDIC expenses	1,198us-gaap_FederalDepositInsuranceCorporationPremiumExpense	1,278us-gaap_FederalDepositInsuranceCorporationPremiumExpense
Advertising	719us-gaap_AdvertisingExpense	739us-gaap_AdvertisingExpense
Amortization of intangible assets	1,284us-gaap_AmortizationOfIntangibleAssets	1,310us-gaap_AmortizationOfIntangibleAssets
Loan collection and other real estate owned	872nbtb_LoanCollectionAndOtherRealEstateOwned	1,040nbtb_LoanCollectionAndOtherRealEstateOwned
Other	4,913us-gaap_OtherNoninterestExpense	5,173us-gaap_OtherNoninterestExpense
Total noninterest expense	57,702us-gaap_NoninterestExpense	57,517us-gaap_NoninterestExpense
Income before income tax expense	27,356us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	26,681us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	9,190us-gaap_IncomeTaxExpenseBenefit	8,672us-gaap_IncomeTaxExpenseBenefit
Net income	$ 18,166us-gaap_NetIncomeLoss	$ 18,009us-gaap_NetIncomeLoss
Earnings per share
Basic (in dollars per share)	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted

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Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from non-transaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (9) issuing stop payment orders; (10) certifying checks; and (11) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.

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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 net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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