$NBTB
NBT BANCORP INC Stock $nbtb

$nbtb Overview Financials Valuation SEC Filings Company Website

2020 Q2 Form 10-Q Financial Statement

#000114036120017984 Filed on August 10, 2020

Income Statement

Concept	2020 Q2	2019 Q2	2019 Q1
Revenue		$93.23M	$91.34M
YoY Change		9.99%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development	$4.079M	$4.693M	$4.414M
YoY Change	-13.08%
% of Gross Profit
Depreciation & Amortization	$3.400M	$3.200M	$3.400M
YoY Change	6.25%	-5.88%	6.25%
% of Gross Profit
Operating Expenses	$4.079M	$4.693M	$4.414M
YoY Change	-13.08%
Operating Profit
YoY Change
Interest Expense	$7.000M	$14.61M	$13.65M
YoY Change	-52.07%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$31.28M	$39.36M	$37.25M
YoY Change	-20.54%	8.73%	12.86%
Income Tax	$6.564M	$8.805M	$8.118M
% Of Pretax Income	20.99%	22.37%	21.8%
Net Earnings	$24.71M	$30.56M	$29.13M
YoY Change	-19.12%	8.66%	12.03%
Net Earnings / Revenue		32.77%	31.89%
Basic Earnings Per Share	$0.57	$0.70	$0.67
Diluted Earnings Per Share	$0.56	$0.69	$0.66
COMMON SHARES
Basic Shares Outstanding	43.64M	43.81M	43.79M
Diluted Shares Outstanding	43.64M	43.81M	43.79M

Balance Sheet

Concept	2020 Q2	2019 Q2	2019 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$699.5M	$189.4M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$75.00M	$76.65M	$111.0M
YoY Change	-2.16%	-2.97%	38.75%
Goodwill		$274.8M
YoY Change
Intangibles		$13.74M
YoY Change
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$10.85B	$9.636B	$9.534B
YoY Change	12.57%	1.78%	3.28%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses		$37.00M	$35.00M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$340.0M	$609.4M	$545.0M
YoY Change	-44.2%	-28.65%	-7.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$340.0M	$37.00M	$35.00M
YoY Change	818.92%	-95.67%	-94.03%
LONG-TERM LIABILITIES
Long-Term Debt	$263.0M	$185.0M	$175.0M
YoY Change	42.16%	5.71%	-7.89%
Other Long-Term Liabilities	$286.0M	$135.0M	$127.0M
YoY Change	111.85%	17.39%	17.59%
Total Long-Term Liabilities	$549.0M	$320.0M	$302.0M
YoY Change	71.56%	10.34%	1.34%
TOTAL LIABILITIES
Total Short-Term Liabilities	$340.0M	$37.00M	$35.00M
Total Long-Term Liabilities	$549.0M	$320.0M	$302.0M
Total Liabilities	$9.705B	$8.561B	$8.499B
YoY Change	13.36%	0.86%	2.67%
SHAREHOLDERS EQUITY
Retained Earnings		$658.1M
YoY Change
Common Stock		$497.0K
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)		$134.5M
YoY Change
Treasury Stock Shares		$5.882M
Shareholders Equity	$1.143B	$1.075B	$1.034B
YoY Change
Total Liabilities & Shareholders Equity	$10.85B	$9.636B	$9.534B
YoY Change	12.57%	1.78%	3.28%

Cashflow Statement

Concept	2020 Q2	2019 Q2	2019 Q1
OPERATING ACTIVITIES
Net Income	$24.71M	$30.56M	$29.13M
YoY Change	-19.12%	8.66%	12.03%
Depreciation, Depletion And Amortization	$3.400M	$3.200M	$3.400M
YoY Change	6.25%	-5.88%	6.25%
Cash From Operating Activities	$36.10M	$22.60M	$39.20M
YoY Change	59.73%	32.16%	-2.24%
INVESTING ACTIVITIES
Capital Expenditures	-$300.0K	-$700.0K	-$1.900M
YoY Change	-57.14%	-12.5%	58.33%
Acquisitions
YoY Change
Other Investing Activities	-$459.7M	-$60.50M	$60.10M
YoY Change	659.83%	-73.35%	-156.12%
Cash From Investing Activities	-$460.0M	-$61.10M	$58.10M
YoY Change	652.86%	-73.19%	-153.7%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net			$27.00K
YoY Change
Cash From Financing Activities	840.0M	50.90M	-101.2M
YoY Change	1550.29%	-75.01%	-248.6%
NET CHANGE
Cash From Operating Activities	36.10M	22.60M	39.20M
Cash From Investing Activities	-460.0M	-61.10M	58.10M
Cash From Financing Activities	840.0M	50.90M	-101.2M
Net Change In Cash	416.1M	12.40M	-3.900M
YoY Change	3255.65%	-274.65%
FREE CASH FLOW
Cash From Operating Activities	$36.10M	$22.60M	$39.20M
Capital Expenditures	-$300.0K	-$700.0K	-$1.900M
Free Cash Flow	$36.40M	$23.30M	$41.10M
YoY Change	56.22%	30.17%	-0.48%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
	dei	Entity Central Index Key EntityCentralIndexKey	0000790359
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
CY2019Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	4239000
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	35011000
	us-gaap	Noninterest Income NoninterestIncome	70434000
	us-gaap	Noninterest Income NoninterestIncome	68062000
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	172000
	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	3328000
	us-gaap	Nature Of Operations NatureOfOperations	<table cellpadding="0" cellspacing="0" class="DSPFListTable" id="za99096c77903464496fbd8ac7223fd0d" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%; text-align: left; color: #000000;"> <tr> <td style="width: 36pt; vertical-align: top; align: right; font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">1.</td> <td style="width: auto; vertical-align: top; text-align: justify;"><div style="font-family: 'Times New Roman'; font-size: 10pt; font-weight: bold;">Description of Business</div></td> </tr> </table> <div style="text-align: left;"><br/></div> <div style="text-align: justify; font-family: 'Times New Roman'; font-size: 10pt;">NBT Bancorp Inc. (the “Company”) is a registered financial holding company incorporated in the state of Delaware in 1986, with its principal headquarters located in Norwich, New York. The principal assets of the Company consist of all of the outstanding shares of common stock of its subsidiaries, including: NBT Bank, National Association (the “Bank”), NBT Financial Services, Inc. (“NBT Financial”), NBT Holdings, Inc. (“NBT Holdings”), CNBF Capital Trust I, NBT Statutory Trust I, NBT Statutory Trust II, Alliance Financial Capital Trust I and Alliance Financial Capital Trust II (collectively, the “Trusts”). The Company’s principal sources of revenue are the management fees and dividends it receives from the Bank, NBT Financial and NBT Holdings.</div> <div style="text-align: justify;"><br/></div> <div style="text-align: justify; font-family: 'Times New Roman'; font-size: 10pt;">The Company’s business, primarily conducted through the Bank, consists of providing commercial banking, retail banking and wealth management services primarily to customers in its market area, which includes central and upstate New York, northeastern Pennsylvania, southern New Hampshire, western Massachusetts, Vermont, the southern coastal Maine area. and now entering Connecticut. The Company has been, and intends to continue to be, a community-oriented financial institution offering a variety of financial services. The Company’s business philosophy is to operate as a community bank with local decision-making, providing a broad array of banking and financial services to retail, commercial and municipal customers.</div>
	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	311000
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.35
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	346000
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0
CY2019Q4	us-gaap	Subordinated Debt SubordinatedDebt	0
CY2020Q2	nbtb	Long Term Debt Excluding Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust And Subordinated Debt LongTermDebtExcludingJuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustAndSubordinatedDebt	64154000
CY2019Q4	nbtb	Long Term Debt Excluding Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust And Subordinated Debt LongTermDebtExcludingJuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustAndSubordinatedDebt	64211000
CY2020Q2	us-gaap	Subordinated Debt SubordinatedDebt	97982000
	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	128000
CY2020Q2	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	128000
	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	0
CY2020Q2	us-gaap	Interest Expense InterestExpense	7000000
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	78627000
	us-gaap	Interest Expense InterestExpense	19220000
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	157627000
	us-gaap	Interest Expense InterestExpense	28259000
CY2020Q2	nbtb	Service Charges On Deposit Accounts ServiceChargesOnDepositAccounts	2529000
CY2020Q2	nbtb	Retirement Plan Administration Fees RetirementPlanAdministrationFees	9214000
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	156318000
CY2020Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	80446000
CY2019Q2	us-gaap	Interest Expense InterestExpense	14606000
CY2020Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	18840000
CY2019Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	7277000
	nbtb	Service Charges On Deposit Accounts ServiceChargesOnDepositAccounts	8460000
CY2020Q2	nbtb	Atm Fees AtmFees	6136000
CY2019Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	71350000
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	143234000
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	13084000
CY2019Q2	nbtb	Atm Fees AtmFees	6156000
CY2020Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	61606000
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	109147000
CY2019Q2	nbtb	Service Charges On Deposit Accounts ServiceChargesOnDepositAccounts	4224000
	nbtb	Service Charges On Deposit Accounts ServiceChargesOnDepositAccounts	6526000
	nbtb	Atm Fees AtmFees	11990000
	nbtb	Atm Fees AtmFees	11681000
CY2019Q2	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	0
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	48480000
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	2755000
	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	8312000
	us-gaap	Professional Fees ProfessionalFees	7300000
	us-gaap	Professional Fees ProfessionalFees	7027000
CY2019Q2	us-gaap	Insurance Agency Management Fee InsuranceAgencyManagementFee	3547000
	us-gaap	Insurance Agency Management Fee InsuranceAgencyManagementFee	7561000
	us-gaap	Insurance Agency Management Fee InsuranceAgencyManagementFee	8291000
CY2020Q2	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1381000
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	2563000
CY2020Q2	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	180000
	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-632000
	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-12000
CY2020Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5456000
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	34241000
CY2020Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	39717000
CY2019Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	38567000
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	80467000
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	77923000
CY2020Q2	us-gaap	Occupancy Net OccupancyNet	5065000
CY2019Q2	us-gaap	Occupancy Net OccupancyNet	5443000
	us-gaap	Occupancy Net OccupancyNet	11718000
CY2020Q2	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	4079000
	nbtb	Retirement Plan Administration Fees RetirementPlanAdministrationFees	15570000
CY2019Q2	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	4693000
	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	9107000
CY2020Q2	us-gaap	Professional Fees ProfessionalFees	3403000
CY2019Q2	us-gaap	Professional Fees ProfessionalFees	3359000
CY2019Q2	nbtb	Wealth Management WealthManagement	7122000
CY2020Q2	us-gaap	Equipment Expense EquipmentExpense	4779000
	nbtb	Wealth Management WealthManagement	14096000
CY2019Q2	us-gaap	Equipment Expense EquipmentExpense	4518000
	us-gaap	Equipment Expense EquipmentExpense	9421000
	us-gaap	Equipment Expense EquipmentExpense	9275000
CY2020Q2	us-gaap	Insurance Agency Management Fee InsuranceAgencyManagementFee	3292000
CY2019Q2	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1186000
CY2020Q2	nbtb	Wealth Management WealthManagement	6823000
CY2019Q2	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-69000
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	10983000
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	7824000
	us-gaap	Advertising Expense AdvertisingExpense	931000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1717000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1861000
CY2020Q2	nbtb	Loan Collection And Other Real Estate Owned LoanCollectionAndOtherRealEstateOwned	728000
CY2019Q2	nbtb	Loan Collection And Other Real Estate Owned LoanCollectionAndOtherRealEstateOwned	961000
	nbtb	Loan Collection And Other Real Estate Owned LoanCollectionAndOtherRealEstateOwned	1745000
	nbtb	Loan Collection And Other Real Estate Owned LoanCollectionAndOtherRealEstateOwned	1746000
CY2020Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3916000
CY2019Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	4630000
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	10873000
CY2020Q2	us-gaap	Noninterest Expense NoninterestExpense	65340000
	us-gaap	Noninterest Expense NoninterestExpense	136221000
	us-gaap	Noninterest Expense NoninterestExpense	134691000
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6564000
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8805000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8279000
	us-gaap	Net Income Loss NetIncomeLoss	59682000
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.70
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.80
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.36
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.69
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	24713000
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	30555000
	us-gaap	Net Income Loss NetIncomeLoss	35081000
CY2019Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	949000
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1966000
CY2020Q2	us-gaap	Advertising Expense AdvertisingExpense	322000
CY2019Q2	us-gaap	Advertising Expense AdvertisingExpense	641000
	us-gaap	Advertising Expense AdvertisingExpense	1144000
CY2020Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	883000
CY2019Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	893000
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesTax	85000
	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesTax	92000
CY2020Q2	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesNetOfTax	123000
CY2019Q2	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesNetOfTax	149000
	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesNetOfTax	253000
	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesNetOfTax	274000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	4948000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	10192000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	21080000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	18668000
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1608000
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3348000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	6943000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	6107000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	20829000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	18320000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	3000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-99000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-25000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0
CY2020Q2	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Before Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesBeforeTax	165000
CY2019Q2	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Before Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesBeforeTax	199000
	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Before Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesBeforeTax	366000
CY2020Q2	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesTax	42000
CY2019Q2	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesTax	50000
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	6433000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	27772000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	24427000
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	4825000
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	10043000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	2000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-74000
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-274000
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	9756000
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	66231000
CY2019Q2	nbtb	Retirement Plan Administration Fees RetirementPlanAdministrationFees	7836000
CY2020Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	31277000
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	39360000
	us-gaap	Net Income Loss NetIncomeLoss	59682000
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	13391000
CY2020Q2	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	695000
CY2020Q2	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	1455000
	nbtb	Retirement Plan Administration Fees RetirementPlanAdministrationFees	17155000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0
	nbtb	Wealth Management WealthManagement	13685000
	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Before Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesBeforeTax	338000
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-19000
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-314000
CY2019Q2	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	1577000
	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	3091000
	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	3168000
CY2020Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	993000
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1304000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-285000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-493000
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-571000
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-985000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9896000
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	21514000
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	18138000
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	29993000
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	40451000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	77820000
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	1112179000
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	24713000
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.00
CY2020Q2	us-gaap	Dividends Cash DividendsCash	2000
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-137000
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-1515000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	381000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	762000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	191000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	328000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	493000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	571000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	985000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	5280000
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1017909000
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	1074823000
	us-gaap	Net Income Loss NetIncomeLoss	35081000
	us-gaap	Net Income Loss NetIncomeLoss	59682000
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	48480000
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1619000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1717000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1861000
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.00
	nbtb	Operating Lease Right Of Use Asset Amortization OperatingLeaseRightOfUseAssetAmortization	3702000
CY2019Q2	us-gaap	Dividends Cash DividendsCash	4000
CY2019Q2	nbtb	Stock Issued During Period Shares Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodSharesEmployeeBenefitPlansAndOtherStockPlans	29525
CY2019Q2	nbtb	Stock Issued During Period Value Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans	-242000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	5280000
	nbtb	Stock Issued During Period Value Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans	-1696000
	us-gaap	Net Income Loss NetIncomeLoss	59682000
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.52
	us-gaap	Dividends Cash DividendsCash	22778000
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	13084000
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	4952000
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	4732000
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1596000
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	1142652000
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3309000
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	21514000
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	1142652000
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	1034055000
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	30555000
	nbtb	Stock Issued During Period Shares Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodSharesEmployeeBenefitPlansAndOtherStockPlans	96445
	nbtb	Stock Issued During Period Value Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans	-1268000
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3140000
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	18138000
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	148658000
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	85000
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	155000
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	13502000
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	14151000
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	502382000
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	48672000
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	98869000
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	527000
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2582000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-572155000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3006000
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1228071000
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	225495000
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-315619000
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-262330000
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	73562000
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	777000
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	739000
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	136764000
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	116022000
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	88299000
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	86209000
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	49482000
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	89334000
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	3586000
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	23634000
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	22778000
	us-gaap	Interest Paid Net InterestPaidNet	19985000
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-50338000
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	482649000
	us-gaap	Interest Paid Net InterestPaidNet	27596000
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4157000
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	13074000
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1168000
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1440000
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	7980000
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	977762000
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	8477000
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	216843000
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	180955000
CY2020Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	699492000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-789000
CY2019Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	189432000
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1017000
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-5000
	us-gaap	Occupancy Net OccupancyNet	11060000
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-78000
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-69000
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-121000
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-14000
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-484000
	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	178000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-91000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	1537000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-20000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	185000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-23000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	385000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-61000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	553000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-68000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	1152000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	47000
	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	-12000
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	255143000
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	120812000
	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	996000
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	0
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	106381000
	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	0
	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	100000000
	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0
CY2020Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	285000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	56595000
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	2755000
CY2020Q2	nbtb	Stock Issued During Period Value Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans	-152000
CY2020Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	634000
CY2019Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	563000
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	1074823000
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1120397000
	us-gaap	Share Based Compensation ShareBasedCompensation	3140000
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	17000
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	65099000
	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	-632000
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	3899000
CY2020Q2	nbtb	Stock Issued During Period Shares Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodSharesEmployeeBenefitPlansAndOtherStockPlans	20905
	us-gaap	Net Income Loss NetIncomeLoss	35081000
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	263507
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	7980000
	nbtb	Stock Issued During Period Shares Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodSharesEmployeeBenefitPlansAndOtherStockPlans	75246
	nbtb	Operating Lease Right Of Use Asset Amortization OperatingLeaseRightOfUseAssetAmortization	3590000
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	26203000
	nbtb	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	0
	nbtb	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	34000
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2035000
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	0
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	10598000
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	57000
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-236000
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.54
	us-gaap	Dividends Cash DividendsCash	23634000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	43360000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	76605000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16923000
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	24713000
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	30555000
	us-gaap	Net Income Loss NetIncomeLoss	35081000
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	55000
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	184000
	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	0
	us-gaap	Use Of Estimates UseOfEstimates	<div style="text-align: justify; font-family: 'Times New Roman'; font-size: 10pt; font-style: italic; font-weight: bold;">Use of Estimates in the Preparation of Financial Statements</div> <div><br/></div> <div style="text-align: justify; font-family: 'Times New Roman'; font-size: 10pt;">The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Actual results may differ from those estimates and such differences could be material to the financial statements.</div>
CY2020Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-81000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	738000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	657000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	1313000
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	829000
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	256000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	77042000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	61821000
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	36588000
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	91636000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	96000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	164000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9896000
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-205000
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-363000
	us-gaap	Share Based Compensation ShareBasedCompensation	3309000
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	2563000
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	101286000
	nbtb	Guarantor Obligations Period GuarantorObligationsPeriod	P1Y
	nbtb	Gains From Calls On Securities Held To Maturity GainsFromCallsOnSecuritiesHeldToMaturity	4000
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	1732000
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	152000
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	3000
CY2019Q2	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	3000
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	53000
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0
CY2020Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1073888000
CY2020Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	34596000
CY2020Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	41000
CY2020Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1108443000
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	968554000
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	8319000
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1533000
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	975340000
CY2020Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2020Q2	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-99000
	nbtb	Gains From Calls On Securities Available For Sale GainsFromCallsOnSecuritiesAvailableForSale	3000
	nbtb	Gains From Calls On Securities Available For Sale GainsFromCallsOnSecuritiesAvailableForSale	4000
CY2019Q2	nbtb	Gains From Calls On Securities Available For Sale GainsFromCallsOnSecuritiesAvailableForSale	0
CY2020Q2	nbtb	Gains From Calls On Securities Available For Sale GainsFromCallsOnSecuritiesAvailableForSale	0
CY2020Q2	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	599164000
CY2020Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	23868000
CY2020Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	10000
CY2020Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	623022000
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	630074000
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	11817000
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	629000
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	1771000
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	1619000
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	641262000
CY2020Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	0
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	87000
	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	0
CY2020Q2	nbtb	Gains From Calls On Securities Held To Maturity GainsFromCallsOnSecuritiesHeldToMaturity	4000
	nbtb	Gains From Calls On Securities Held To Maturity GainsFromCallsOnSecuritiesHeldToMaturity	0
CY2019Q2	nbtb	Gains From Calls On Securities Held To Maturity GainsFromCallsOnSecuritiesHeldToMaturity	0
CY2020Q2	us-gaap	Debt Securities Held To Maturity Sold Amount DebtSecuritiesHeldToMaturitySoldAmount	1000000.0
	us-gaap	Debt Securities Held To Maturity Sold Amount DebtSecuritiesHeldToMaturitySoldAmount	1000000.0
	nbtb	Debt Securities Held To Maturity Sold Accumulated Unrecognized Loss DebtSecuritiesHeldToMaturitySoldAccumulatedUnrecognizedLoss	1000
CY2020Q2	nbtb	Debt Securities Held To Maturity Sold Accumulated Unrecognized Loss DebtSecuritiesHeldToMaturitySoldAccumulatedUnrecognizedLoss	1000
CY2019Q2	us-gaap	Debt Securities Held To Maturity Sold Amount DebtSecuritiesHeldToMaturitySoldAmount	0
	us-gaap	Debt Securities Held To Maturity Sold Amount DebtSecuritiesHeldToMaturitySoldAmount	0
CY2019Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Securities Pledged PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged	1300000000
CY2020Q2	us-gaap	Pledged Financial Instruments Not Separately Reported Securities Pledged PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged	1300000000
CY2020Q2	nbtb	Amortized Costs Of Securities Available For Sale And Held To Maturity Pledged As Collateral For Repurchase Agreements AmortizedCostsOfSecuritiesAvailableForSaleAndHeldToMaturityPledgedAsCollateralForRepurchaseAgreements	249800000
CY2019Q4	nbtb	Amortized Costs Of Securities Available For Sale And Held To Maturity Pledged As Collateral For Repurchase Agreements AmortizedCostsOfSecuritiesAvailableForSaleAndHeldToMaturityPledgedAsCollateralForRepurchaseAgreements	189800000
CY2020Q2	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	177000
CY2019Q2	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-69000
CY2020Q2	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	0
CY2019Q2	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	0
CY2020Q2	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	177000
CY2019Q2	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-69000
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-638000
	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	0
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-638000
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	87000
CY2019Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	4000000.0
CY2020Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	4000000.0
	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0
	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	0
CY2020Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	0
	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0
	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0
CY2020Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0
CY2019Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0
CY2020Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0
	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0
CY2019Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0
	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	0
CY2019Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	0
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	373236000
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	388583000
CY2019Q4	nbtb	Number Of Issuers Whose Holdings Exceeded Ten Percent Of Consolidated Stockholders Equity Excluding Us Government Securities And Government Sponsored Enterprises Securities NumberOfIssuersWhoseHoldingsExceededTenPercentOfConsolidatedStockholdersEquityExcludingUSGovernmentSecuritiesAndGovernmentSponsoredEnterprisesSecurities	0
CY2020Q2	nbtb	Number Of Issuers Whose Holdings Exceeded Ten Percent Of Consolidated Stockholders Equity Excluding Us Government Securities And Government Sponsored Enterprises Securities NumberOfIssuersWhoseHoldingsExceededTenPercentOfConsolidatedStockholdersEquityExcludingUSGovernmentSecuritiesAndGovernmentSponsoredEnterprisesSecurities	0
CY2020Q2	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	599164000
CY2020Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	623022000
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	154845000
CY2020Q2	nbtb	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	0
CY2020Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	990000
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1137000
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	1179000
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	19997000
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	20682000
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	201736000
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	208054000
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	851018000
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	878528000
CY2020Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1073888000
CY2020Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1108443000
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	19161000
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	19190000
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	59201000
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	60404000
CY2020Q2	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	147566000
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	20594000
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	28000
CY2020Q2	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	5
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	3822000
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	13000
CY2020Q2	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	3
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	24416000
CY2020Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	41000
CY2020Q2	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	8
CY2020Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	990000
CY2020Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	10000
CY2020Q2	nbtb	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	1
CY2020Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	0
CY2020Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	0
CY2020Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	10000
CY2020Q2	us-gaap	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	1
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	198501000
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	718000
CY2019Q4	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	48
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	97243000
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	815000
CY2019Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	34
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	295744000
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	20297000
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	1533000
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	187000
CY2019Q4	nbtb	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	7
CY2019Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	82
CY2020Q2	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	22426000
CY2020Q2	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	25567000
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	47759000
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	442000
CY2019Q4	nbtb	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	7
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	68056000
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	629000
CY2019Q4	us-gaap	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	14
CY2020Q2	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	8
CY2020Q2	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	2600000
CY2020Q2	us-gaap	Debt Securities Held To Maturity Past Due DebtSecuritiesHeldToMaturityPastDue	0
	nbtb	Debt Securities Held To Maturity Accrued Interest Receivables Reversed DebtSecuritiesHeldToMaturityAccruedInterestReceivablesReversed	0
CY2020Q2	nbtb	Debt Securities Held To Maturity Collateral Dependent DebtSecuritiesHeldToMaturityCollateralDependent	0
CY2020Q2	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss	2300000
CY2020Q2	nbtb	Financing Receivable Individually Evaluated For Impairment Number Of Relationships FinancingReceivableIndividuallyEvaluatedForImpairmentNumberOfRelationships	0
CY2020Q1	nbtb	Financing Receivable Individually Evaluated For Impairment Number Of Relationships FinancingReceivableIndividuallyEvaluatedForImpairmentNumberOfRelationships	1
CY2020Q1	nbtb	Loans And Leases Receivable Individually Evaluated For Impairment LoansAndLeasesReceivableIndividuallyEvaluatedForImpairment	4200000
CY2020Q1	nbtb	Loans And Leases Receivable Allowance For Credit Losses Individually Evaluated For Impairment LoansAndLeasesReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment	2100000
CY2020Q2	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	7579998000
CY2020Q2	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	7627991000
CY2020Q2	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	0
	nbtb	Threshold Period Past Due For Loans To Be Considered Nonperforming ThresholdPeriodPastDueForLoansToBeConsideredNonperforming	P90D
CY2020Q2	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	1297018000
CY2020Q2	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	1491043000
CY2020Q2	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	1086557000
CY2020Q2	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	888249000
CY2020Q2	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	598519000
CY2020Q2	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	1459207000
CY2020Q2	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	790186000
CY2020Q2	us-gaap	Financing Receivable Revolving Converted To Term Loan FinancingReceivableRevolvingConvertedToTermLoan	17212000
CY2020Q2	us-gaap	Notes Receivable Gross NotesReceivableGross	7627991000
CY2020Q2	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	7
CY2020Q2	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	269000
CY2020Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	294000
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	15
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	1004000
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	1073000
CY2020Q2	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	27
CY2020Q2	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	1673000
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	40
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	2747000
CY2019Q1	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	71405000
CY2019Q2	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	8432000
CY2019Q2	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	1915000
CY2019Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	7277000
CY2019Q2	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	72165000
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	72505000
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	16886000
	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	3462000
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	13084000
CY2019Q2	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	72165000
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	72965000
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	0
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	72965000
CY2019Q4	nbtb	Financing Receivable Individually And Collectively Evaluated For Impairment FinancingReceivableIndividuallyAndCollectivelyEvaluatedForImpairment	7136098000
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	34803000
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	25174000
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	7076121000
CY2019Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	7136098000
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	18253000
CY2019Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	22541000
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	0
CY2019Q2	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	20857000
CY2019Q2	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	220000
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	20947000
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	434000
CY2019Q2	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	8
CY2019Q2	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	497000
CY2019Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	518000
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	28
CY2019Q2	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	22
CY2019Q2	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	925000
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	34
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	30555000
CY2020Q2	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0
CY2019Q2	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0
	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0
	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43637000
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43809000
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	24713000
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.70
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43637000
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43809000
CY2020Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	291000
CY2019Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	311000
CY2020Q2	us-gaap	Pro Forma Weighted Average Shares Outstanding Diluted ProFormaWeightedAverageSharesOutstandingDiluted	43928000
CY2019Q2	us-gaap	Pro Forma Weighted Average Shares Outstanding Diluted ProFormaWeightedAverageSharesOutstandingDiluted	44120000
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	24713000
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	30555000
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.69
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43735000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43797000
	us-gaap	Net Income Loss NetIncomeLoss	35081000
	us-gaap	Net Income Loss NetIncomeLoss	59682000
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.80
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.36
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43735000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43797000
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	291000
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	300000
	us-gaap	Pro Forma Weighted Average Shares Outstanding Diluted ProFormaWeightedAverageSharesOutstandingDiluted	44026000
	us-gaap	Pro Forma Weighted Average Shares Outstanding Diluted ProFormaWeightedAverageSharesOutstandingDiluted	44097000
	us-gaap	Net Income Loss NetIncomeLoss	35081000
	us-gaap	Net Income Loss NetIncomeLoss	59682000
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.35
CY2019Q4	nbtb	Loans And Leases Receivable Collateral Dependent Loans Specific Reserves LoansAndLeasesReceivableCollateralDependentLoansSpecificReserves	0
CY2020Q2	nbtb	Loans And Leases Receivable Collateral Dependent Loans Specific Reserves LoansAndLeasesReceivableCollateralDependentLoansSpecificReserves	0

Files In Submission

Name	View Source	Status
0001140361-20-017984-index-headers.html	Edgar Link	pending
0001140361-20-017984-index.html	Edgar Link	pending
0001140361-20-017984.txt	Edgar Link	pending
0001140361-20-017984-xbrl.zip	Edgar Link	pending
brhc10014081_10q.htm	Edgar Link	pending
brhc10014081_10q_htm.xml	Edgar Link	completed
brhc10014081_ex31-1q.htm	Edgar Link	pending
brhc10014081_ex31-2q.htm	Edgar Link	pending
brhc10014081_ex32-1q.htm	Edgar Link	pending
brhc10014081_ex32-2q.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
nbtb-20200630.xsd	Edgar Link	pending
nbtb-20200630_cal.xml	Edgar Link	unprocessable
nbtb-20200630_def.xml	Edgar Link	unprocessable
nbtb-20200630_lab.xml	Edgar Link	unprocessable
nbtb-20200630_pre.xml	Edgar Link	unprocessable
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$NBTB
NBT BANCORP INC Stock $nbtb

2020 Q2 Form 10-Q Financial Statement

#000114036120017984 Filed on August 10, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NBTB NBT BANCORP INC Stock $nbtb

2020 Q2 Form 10-Q Financial Statement

#000114036120017984 Filed on August 10, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NBTB
NBT BANCORP INC Stock $nbtb