$NBTB
NBT BANCORP INC Stock $nbtb

$nbtb Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000114036124010464 Filed on February 29, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$146.9M		$144.7M
YoY Change	28.68%		-3.93%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development	$9.750M		$38.16M
YoY Change	8.25%		6.86%
% of Gross Profit
Depreciation & Amortization	$5.023M	$5.029M	$15.43M
YoY Change	61.25%	61.6%	24.25%
% of Gross Profit
Operating Expenses	$9.750M		$38.16M
YoY Change	8.25%		6.86%
Operating Profit
YoY Change
Interest Expense	$51.76M		$144.6M
YoY Change	170.64%		560.74%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$43.21M	$39.78M	$153.5M
YoY Change	-0.07%	-14.78%	-21.77%
Income Tax	$9.391M	$9.338M	$34.68M
% Of Pretax Income	21.73%	23.47%	22.6%
Net Earnings	$33.82M	$30.45M	$118.8M
YoY Change	0.49%	-15.71%	-21.85%
Net Earnings / Revenue	23.02%		82.06%
Basic Earnings Per Share	$0.72		$2.67
Diluted Earnings Per Share	$0.71	$0.64	$2.65
COMMON SHARES
Basic Shares Outstanding	47.15M	47.09M	44.53M
Diluted Shares Outstanding	47.15M		44.77M

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$319.1M	$205.2M
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	$80.24M	$80.68M	$80.68M
YoY Change	18.23%	16.84%	16.84%
Goodwill	$361.9M	$361.9M
YoY Change	28.68%	28.68%
Intangibles	$38.97M	$40.44M
YoY Change	460.29%	450.92%
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	$13.44B	$13.31B	$13.31B
YoY Change	13.51%	13.37%	13.37%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses			$28.20M
YoY Change			10.16%
Deferred Revenue
YoY Change
Short-Term Debt	$267.1M	$386.7M	$386.7M
YoY Change	-43.79%	-33.91%	-33.91%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$267.1M	$386.7M	$386.7M
YoY Change	-43.79%	-33.91%	1410.36%
LONG-TERM LIABILITIES
Long-Term Debt	$251.1M	$250.7M	$250.7M
YoY Change	10.1%	23.55%	23.55%
Other Long-Term Liabilities	$284.3M	$277.0M	$277.0M
YoY Change	16.7%	-1.74%	-1.74%
Total Long-Term Liabilities	$535.4M	$527.7M	$527.7M
YoY Change	13.51%	8.85%	8.85%
TOTAL LIABILITIES
Total Short-Term Liabilities	$267.1M	$386.7M	$386.7M
Total Long-Term Liabilities	$535.4M	$527.7M	$527.7M
Total Liabilities	$12.00B	$11.88B	$11.88B
YoY Change	12.89%	12.47%	12.47%
SHAREHOLDERS EQUITY
Retained Earnings	$1.041B	$1.022B
YoY Change	6.21%	6.61%
Common Stock	$540.0K	$540.0K
YoY Change	8.65%	8.65%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.441B	$1.426B	$1.426B
YoY Change
Total Liabilities & Shareholders Equity	$13.44B	$13.31B	$13.31B
YoY Change	13.51%	13.37%	13.37%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$33.82M	$30.45M	$118.8M
YoY Change	0.49%	-15.71%	-21.85%
Depreciation, Depletion And Amortization	$5.023M	$5.029M	$15.43M
YoY Change	61.25%	61.6%	24.25%
Cash From Operating Activities	$36.75M	$35.66M	$157.5M
YoY Change	68.19%	20.05%	-14.06%
INVESTING ACTIVITIES
Capital Expenditures	$2.425M	$2.954M	$9.254M
YoY Change	74.21%	30.71%	32.03%
Acquisitions	$743.0K		-$44.56M
YoY Change	475.97%		-1803.52%
Other Investing Activities	-$10.70M	$51.13M	-$34.97M
YoY Change	-85.57%	-122.72%	-96.2%
Cash From Investing Activities	-$13.13M	$48.17M	-$44.23M
YoY Change	-82.63%	-121.2%	-95.23%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	90.29M	-551.3M	-105.4M
YoY Change	4.79%	-846.3%	-67.94%
NET CHANGE
Cash From Operating Activities	36.75M	35.66M	157.5M
Cash From Investing Activities	-13.13M	48.17M	-44.23M
Cash From Financing Activities	90.29M	-551.3M	-105.4M
Net Change In Cash	113.9M	-467.5M	7.839M
YoY Change	251.06%	277.87%	-100.73%
FREE CASH FLOW
Cash From Operating Activities	$36.75M	$35.66M	$157.5M
Capital Expenditures	$2.425M	$2.954M	$9.254M
Free Cash Flow	$34.32M	$32.70M	$148.2M
YoY Change	67.78%	19.17%	-15.9%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
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CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0000790359
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CY2023	dei	Auditor Firm AuditorFirmId	185
CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Entity File Number EntityFileNumber	0-14703
CY2023	dei	Entity Registrant Name EntityRegistrantName	NBT BANCORP INC
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	16-1268674
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	52 South Broad Street
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Norwich
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	13815
CY2023	dei	City Area Code CityAreaCode	607
CY2023	dei	Local Phone Number LocalPhoneNumber	337-2265
CY2023	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
CY2023	dei	Trading Symbol TradingSymbol	NBTB
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2022	us-gaap	Insurance Agency Management Fee InsuranceAgencyManagementFee	14696000
CY2021	us-gaap	Insurance Agency Management Fee InsuranceAgencyManagementFee	14083000
CY2023	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6750000
CY2022	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6044000
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6217000
CY2023	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-9315000
CY2022	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-1131000
CY2021	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	566000
CY2023	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	10838000
CY2022	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	10858000
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	12992000
CY2023	us-gaap	Noninterest Income NoninterestIncome	142178000
CY2022	us-gaap	Noninterest Income NoninterestIncome	155578000
CY2021	us-gaap	Noninterest Income NoninterestIncome	157794000
CY2023	us-gaap	Labor And Related Expense LaborAndRelatedExpense	194250000
CY2022	us-gaap	Labor And Related Expense LaborAndRelatedExpense	187830000
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	172580000
CY2023	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	38163000
CY2022	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	35712000
CY2021	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	34717000
CY2023	us-gaap	Occupancy Net OccupancyNet	28408000
CY2022	us-gaap	Occupancy Net OccupancyNet	26282000
CY2023	us-gaap	Professional Fees ProfessionalFees	17601000
CY2022	us-gaap	Professional Fees ProfessionalFees	16810000
CY2021	us-gaap	Professional Fees ProfessionalFees	16306000
CY2023	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	6917000
CY2022	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	6140000
CY2021	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	6006000
CY2023	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	6257000
CY2022	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3197000
CY2021	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3041000
CY2023	us-gaap	Advertising Expense AdvertisingExpense	3054000
CY2022	us-gaap	Advertising Expense AdvertisingExpense	2822000
CY2021	us-gaap	Advertising Expense AdvertisingExpense	2521000
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4734000
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2263000
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2808000
CY2023	nbtb	Loan Collection And Other Real Estate Owned LoanCollectionAndOtherRealEstateOwned	2618000
CY2022	nbtb	Loan Collection And Other Real Estate Owned LoanCollectionAndOtherRealEstateOwned	2647000
CY2021	nbtb	Loan Collection And Other Real Estate Owned LoanCollectionAndOtherRealEstateOwned	2915000
CY2023	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	9978000
CY2022	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	967000
CY2021	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0
CY2023	us-gaap	Other Noninterest Expense OtherNoninterestExpense	29684000
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	19795000
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	20339000
CY2023	us-gaap	Noninterest Expense NoninterestExpense	341664000
CY2022	us-gaap	Noninterest Expense NoninterestExpense	304465000
CY2021	us-gaap	Noninterest Expense NoninterestExpense	287281000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	153459000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	196156000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	199858000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34677000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44161000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44973000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	118782000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	151995000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154885000
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.67
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.54
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.57
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.65
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.52
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.54
CY2023	us-gaap	Net Income Loss NetIncomeLoss	118782000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	151995000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154885000
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	22987000
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-209212000
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-37432000
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	5746000
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-52303000
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-9358000
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	17241000
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-156909000
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-28074000
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-9450000
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-2363000
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-7087000
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0
CY2023	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Before Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesBeforeTax	427000
CY2022	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Before Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesBeforeTax	513000
CY2021	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Before Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesBeforeTax	577000
CY2023	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesTax	107000
CY2022	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesTax	128000
CY2021	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesTax	145000
CY2023	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesNetOfTax	320000
CY2022	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesNetOfTax	385000
CY2021	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesNetOfTax	432000
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	24648000
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-156524000
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-27642000
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	0
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	0
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-21000
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-5000
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	0
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	0
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-16000
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	0
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	0
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	16000
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	2640000
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	737000
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	1373000
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	660000
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	184000
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	343000
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	1980000
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	553000
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	1030000
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	3296000
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-14292000
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	3780000
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	824000
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-3573000
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	945000
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	2472000
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-10719000
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	2835000
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-4452000
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	10166000
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3865000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	29100000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-166690000
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-23761000
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	147882000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-14695000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	131124000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	1187618000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154885000
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.1
CY2021	us-gaap	Dividends Cash DividendsCash	47738000
CY2021	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	604637
CY2021	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	21714000
CY2021	nbtb	Stock Issued During Period Shares Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodSharesEmployeeBenefitPlansAndOtherStockPlans	143555
CY2021	nbtb	Stock Issued During Period Value Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans	-3251000
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4414000
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-23761000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	1250453000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	151995000
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.16
CY2022	us-gaap	Dividends Cash DividendsCash	49765000
CY2022	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	400000
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	14713000
CY2022	nbtb	Stock Issued During Period Shares Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodSharesEmployeeBenefitPlansAndOtherStockPlans	89811
CY2022	nbtb	Stock Issued During Period Value Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans	-2256000
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4530000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-166690000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	1173554000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	118782000
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.24
CY2023	us-gaap	Dividends Cash DividendsCash	55886000
CY2023	us-gaap	Stock Issued During Period Shares Acquisitions StockIssuedDuringPeriodSharesAcquisitions	4322999
CY2023	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	161723000
CY2023	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	155500
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	4944000
CY2023	nbtb	Stock Issued During Period Shares Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodSharesEmployeeBenefitPlansAndOtherStockPlans	84577
CY2023	nbtb	Stock Issued During Period Value Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans	-2242000
CY2023	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	5102000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	29100000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	1425691000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	118782000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	151995000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154885000
CY2023	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	25274000
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	17147000
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-8257000
CY2023	us-gaap	Depreciation Nonproduction DepreciationNonproduction	10695000
CY2022	us-gaap	Depreciation Nonproduction DepreciationNonproduction	10155000
CY2021	us-gaap	Depreciation Nonproduction DepreciationNonproduction	9896000
CY2023	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-2736000
CY2022	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-3460000
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-5832000
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4734000
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2263000
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2808000
CY2023	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	6843000
CY2022	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	6643000
CY2021	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	7176000
CY2023	nbtb	Excess Tax Benefit From Share Based Compensation ExcessTaxBenefitFromShareBasedCompensation	296000
CY2022	nbtb	Excess Tax Benefit From Share Based Compensation ExcessTaxBenefitFromShareBasedCompensation	288000
CY2021	nbtb	Excess Tax Benefit From Share Based Compensation ExcessTaxBenefitFromShareBasedCompensation	385000
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	5102000
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	4530000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	4414000
CY2023	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6750000
CY2022	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6044000
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6217000
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	437000
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	437000
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	438000
CY2023	nbtb	Discount On Repurchase Of Debt Instrument DiscountOnRepurchaseOfDebtInstrument	0
CY2022	nbtb	Discount On Repurchase Of Debt Instrument DiscountOnRepurchaseOfDebtInstrument	-106000
CY2021	nbtb	Discount On Repurchase Of Debt Instrument DiscountOnRepurchaseOfDebtInstrument	0
CY2023	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	53969000
CY2022	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	5674000
CY2021	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	55065000
CY2023	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	55960000
CY2022	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	5475000
CY2021	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	54608000
CY2023	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	156000
CY2022	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	122000
CY2021	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	361000
CY2023	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-9315000
CY2022	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-1131000
CY2021	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	566000
CY2023	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	69000
CY2022	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	259000
CY2021	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-182000
CY2023	nbtb	Impairment Of Minority Interest Equity Investment ImpairmentOfMinorityInterestEquityInvestment	4750000
CY2022	nbtb	Impairment Of Minority Interest Equity Investment ImpairmentOfMinorityInterestEquityInvestment	0
CY2021	nbtb	Impairment Of Minority Interest Equity Investment ImpairmentOfMinorityInterestEquityInvestment	0
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	5958000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-19850000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	864000
CY2023	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	27907000
CY2022	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-11932000
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	11981000
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	157457000
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	183223000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	159185000
CY2023	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-44564000
CY2022	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2616000
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1550000
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	116453000
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	213722000
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	395386000
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	124577000
CY2022	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0
CY2023	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	0
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	264569000
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	775963000
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	100954000
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	177554000
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	181620000
CY2023	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	88022000
CY2022	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	365033000
CY2021	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	299014000
CY2023	nbtb	Proceeds From Calls Of Equity Securities ProceedsFromCallsOfEquitySecurities	0
CY2022	nbtb	Proceeds From Calls Of Equity Securities ProceedsFromCallsOfEquitySecurities	0
CY2021	nbtb	Proceeds From Calls Of Equity Securities ProceedsFromCallsOfEquitySecurities	1000000
CY2023	nbtb	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	11000
CY2022	nbtb	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	1000000
CY2021	nbtb	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	0
CY2023	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	338111000
CY2022	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	659949000
CY2021	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	9305000
CY2023	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	91535000
CY2022	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	36125000
CY2021	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	2422000
CY2023	nbtb	Payments To Acquire Federal Reserve Bank Stock And Federal Home Loan Bank Stock PaymentsToAcquireFederalReserveBankStockAndFederalHomeLoanBankStock	90945000
CY2022	nbtb	Payments To Acquire Federal Reserve Bank Stock And Federal Home Loan Bank Stock PaymentsToAcquireFederalReserveBankStockAndFederalHomeLoanBankStock	55740000
CY2021	nbtb	Payments To Acquire Federal Reserve Bank Stock And Federal Home Loan Bank Stock PaymentsToAcquireFederalReserveBankStockAndFederalHomeLoanBankStock	167000
CY2023	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	3766000
CY2022	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1873000
CY2021	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	4413000
CY2023	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	0
CY2022	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	0
CY2021	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	40000000
CY2023	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	9254000
CY2022	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	7009000
CY2021	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	7740000
CY2023	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	268000
CY2022	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	426000
CY2021	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	1290000
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-44226000
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-926216000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-547608000
CY2023	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	164085000
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-738536000
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1152777000
CY2023	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-231743000
CY2022	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	487217000
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-70592000
CY2023	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0
CY2022	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	2000000
CY2021	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0
CY2023	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	25000000
CY2022	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	1519000
CY2021	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	0
CY2023	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	118000
CY2022	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	10699000
CY2021	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	25101000
CY2023	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	91000
CY2022	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	0
CY2021	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	112000
CY2023	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1877000
CY2022	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1751000
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2931000
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	4944000
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	14713000
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	21714000
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	55886000
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	49765000
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	47738000
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-105392000
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-328728000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	984813000
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	7839000
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-1071721000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	596390000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	197350000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1269071000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	672681000
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	205189000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	197350000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1269071000
CY2023	us-gaap	Interest Paid Net InterestPaidNet	130180000
CY2022	us-gaap	Interest Paid Net InterestPaidNet	20608000
CY2021	us-gaap	Interest Paid Net InterestPaidNet	20285000
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	27636000
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	62795000
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	46097000
CY2023	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	94000
CY2022	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	105000
CY2021	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	181000
CY2023	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	1415712000
CY2022	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	705000
CY2021	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	0
CY2023	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	1380386000
CY2022	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	0
CY2021	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	0
CY2023	us-gaap	Stock Issued1 StockIssued1	161723000
CY2022	us-gaap	Stock Issued1 StockIssued1	0
CY2021	us-gaap	Stock Issued1 StockIssued1	0
CY2023	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	0
CY2023	nbtb	Threshold Period Past Due For Loans To Be Considered Nonperforming ThresholdPeriodPastDueForLoansToBeConsideredNonperforming	P90D
CY2023	nbtb	Period Of Sustained Repayment Performance For Nonperforming Tdrs To Be Returned To Performing Status PeriodOfSustainedRepaymentPerformanceForNonperformingTdrsToBeReturnedToPerformingStatus	P6M
CY2023	nbtb	Standby Letters Of Credit Expiration Period StandbyLettersOfCreditExpirationPeriod	P1Y
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	144742000
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	150665000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	151011000
CY2023	nbtb	Non Interest Income1 NonInterestIncome1	-2564000
CY2022	nbtb	Non Interest Income1 NonInterestIncome1	4913000
CY2021	nbtb	Non Interest Income1 NonInterestIncome1	6783000
CY2023	us-gaap	Noninterest Income NoninterestIncome	142178000
CY2022	us-gaap	Noninterest Income NoninterestIncome	155578000
CY2021	us-gaap	Noninterest Income NoninterestIncome	157794000
CY2023	nbtb	Fair Value Of Acquired Pcd Loans FairValueOfAcquiredPCDLoans	<span style="color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 10pt; font-style: normal; font-variant: normal; font-weight: normal;">The following table provides details related to the fair value of acquired PCD loans. </span> <div style="text-align: justify; color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 10pt;"> <div style="font-family: 'Times New Roman';"><br/> </div> <table cellpadding="0" cellspacing="0" class="cfttable" style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; text-align: left; color: #000000; width: 100%;"> <tr> <td style="vertical-align: bottom; border-bottom: 2px solid rgb(0, 0, 0); font-family: 'Times New Roman'; white-space: nowrap;" valign="bottom"> <div style="text-align: left; color: rgb(0, 0, 0); font-size: 10pt; font-style: italic;">(In thousands)</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; vertical-align: bottom; border-bottom: 2px solid rgb(0, 0, 0); white-space: nowrap;" valign="bottom"> </td> <td colspan="2" style="vertical-align: bottom; font-family: 'Times New Roman'; border-bottom: 2px solid rgb(0, 0, 0); white-space: nowrap;" valign="bottom"> <div style="text-align: center; font-size: 10pt; font-weight: bold;">PCD Loans</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: left; vertical-align: bottom; border-bottom: 2px solid rgb(0, 0, 0); white-space: nowrap;" valign="bottom"> </td> </tr> <tr> <td style="vertical-align: bottom; font-family: 'Times New Roman'; width: 88%; border-bottom: #000000 solid 2px; background-color: #CCEEFF;" valign="bottom"> <div style="text-align: left; color: rgb(0, 0, 0); font-size: 10pt;">Par value of PCD loans at acquisition</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: right; vertical-align: bottom; width: 1%; border-bottom: #000000 solid 2px; background-color: #CCEEFF;" valign="bottom"> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: left; vertical-align: bottom; width: 1%; border-bottom: #000000 solid 2px; background-color: #CCEEFF;" valign="bottom"> <div style="color: rgb(0, 0, 0); font-size: 10pt; font-weight: bold;">$</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; vertical-align: bottom; text-align: right; width: 9%; border-bottom: #000000 solid 2px; background-color: #CCEEFF;" valign="bottom"> <div style="color: rgb(0, 0, 0); font-size: 10pt; font-weight: bold;">219,076</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: left; vertical-align: bottom; width: 1%; border-bottom: #000000 solid 2px; background-color: #CCEEFF; white-space: nowrap;" valign="bottom"> </td> </tr> <tr> <td style="vertical-align: bottom; font-family: 'Times New Roman'; width: 88%;" valign="bottom"> <div style="text-align: left; color: rgb(0, 0, 0); font-size: 10pt;">Allowance for credit losses at acquisition</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: right; vertical-align: bottom; width: 1%;" valign="bottom"> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: left; vertical-align: bottom; width: 1%;" valign="bottom"> </td> <td colspan="1" style="font-family: 'Times New Roman'; vertical-align: bottom; text-align: right; width: 9%;" valign="bottom"> <div style="color: rgb(0, 0, 0); font-size: 10pt; font-weight: bold;">5,772</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: left; vertical-align: bottom; width: 1%; white-space: nowrap;" valign="bottom"> </td> </tr> <tr> <td style="vertical-align: bottom; font-family: 'Times New Roman'; width: 88%; border-bottom: #000000 solid 2px; background-color: #CCEEFF;" valign="bottom"> <div style="text-align: left; color: rgb(0, 0, 0); font-size: 10pt;">Discount at acquisition</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: right; vertical-align: bottom; width: 1%; border-bottom: #000000 solid 2px; background-color: #CCEEFF;" valign="bottom"> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: left; vertical-align: bottom; width: 1%; border-bottom: #000000 solid 2px; background-color: #CCEEFF;" valign="bottom"> </td> <td colspan="1" style="font-family: 'Times New Roman'; vertical-align: bottom; text-align: right; width: 9%; border-bottom: #000000 solid 2px; background-color: #CCEEFF;" valign="bottom"> <div style="color: rgb(0, 0, 0); font-size: 10pt; font-weight: bold;">(24,512</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: left; vertical-align: bottom; width: 1%; border-bottom: #000000 solid 2px; background-color: #CCEEFF; white-space: nowrap;" valign="bottom"> <div style="color: rgb(0, 0, 0); font-size: 10pt; font-weight: bold;">)</div> </td> </tr> <tr> <td style="vertical-align: bottom; font-family: 'Times New Roman'; width: 88%; border-bottom: #000000 double 4px;" valign="bottom"> <div style="text-align: left; color: rgb(0, 0, 0); font-size: 10pt;">Fair value of PCD loans at acquisition</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: right; vertical-align: bottom; width: 1%; border-bottom: #000000 double 4px;" valign="bottom"> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: left; vertical-align: bottom; width: 1%; border-bottom: #000000 double 4px;" valign="bottom"> <div style="color: rgb(0, 0, 0); font-size: 10pt; font-weight: bold;">$</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; vertical-align: bottom; text-align: right; width: 9%; border-bottom: #000000 double 4px;" valign="bottom"> <div style="color: rgb(0, 0, 0); font-size: 10pt; font-weight: bold;">200,336</div> </td> <td colspan="1" style="font-family: 'Times New Roman'; text-align: left; vertical-align: bottom; width: 1%; border-bottom: #000000 double 4px; white-space: nowrap;" valign="bottom"> </td> </tr> </table> </div>
CY2023	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	542241000
CY2022	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	578543000
CY2023	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	112330000
CY2022	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	168101000
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1615078000
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	47000
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	184267000
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1430858000
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1743882000
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	38000
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	216695000
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1527225000
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2022Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2023	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	4500000
CY2022	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0
CY2021	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0
CY2022	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0
CY2023Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	905267000
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	271000
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	91014000
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	814524000
CY2022Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	919517000
CY2022Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	209000
CY2022Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	107079000
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	812647000
CY2023Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	0
CY2022Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	0
CY2023	nbtb	Gains From Calls On Securities Held To Maturity GainsFromCallsOnSecuritiesHeldToMaturity	0
CY2022	nbtb	Gains From Calls On Securities Held To Maturity GainsFromCallsOnSecuritiesHeldToMaturity	4000
CY2021	nbtb	Gains From Calls On Securities Held To Maturity GainsFromCallsOnSecuritiesHeldToMaturity	29000
CY2023	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	135000
CY2022	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-1135000
CY2023	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	0
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CY2023	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	135000
CY2022	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-1135000
CY2022Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	1000000
CY2023Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	1000000
CY2022	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	0
CY2023	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0
CY2023	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0
CY2023	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	0
CY2022	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0
CY2022	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	50389000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	49462000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	536097000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	483546000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	356944000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	315359000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	671648000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	582491000
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1615078000
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1430858000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	92757000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	92724000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	113075000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	109686000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	262943000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	231113000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	436492000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	381001000
CY2023Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	905267000
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	814524000
CY2023Q4	nbtb	Number Of Issuers Whose Holdings Exceeded Ten Percent Of Consolidated Stockholders Equity Excluding Us Government Securities NumberOfIssuersWhoseHoldingsExceededTenPercentOfConsolidatedStockholdersEquityExcludingUSGovernmentSecurities	0
CY2021Q4	nbtb	Number Of Issuers Whose Holdings Exceeded Ten Percent Of Consolidated Stockholders Equity Excluding Us Government Securities NumberOfIssuersWhoseHoldingsExceededTenPercentOfConsolidatedStockholdersEquityExcludingUSGovernmentSecurities	0
CY2022Q4	nbtb	Number Of Issuers Whose Holdings Exceeded Ten Percent Of Consolidated Stockholders Equity Excluding Us Government Securities NumberOfIssuersWhoseHoldingsExceededTenPercentOfConsolidatedStockholdersEquityExcludingUSGovernmentSecurities	0
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	2765000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	82000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	10
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	1422826000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	184185000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	378
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1425591000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	184267000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	388
CY2023Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Less Than12 Months Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsLessThan12MonthsFairValue	26643000
CY2023Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Less Than12 Months Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss	492000
CY2023Q4	nbtb	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	22
CY2023Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions12 Months Or Longer Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositions12MonthsOrLongerFairValue	675260000
CY2023Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions12 Months Or Longer Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositions12MonthsOrLongerAccumulatedLoss	90522000
CY2023Q4	nbtb	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	280
CY2023Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsFairValue	701903000
CY2023Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsAccumulatedLoss	91014000
CY2023Q4	nbtb	Debt Securities Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions DebtSecuritiesHeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	302
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	509788000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	36681000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	245
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	1012964000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	180014000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	170
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1522752000
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	216695000
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	415
CY2022Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Less Than12 Months Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsLessThan12MonthsFairValue	393788000
CY2022Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Less Than12 Months Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsLessThan12MonthsAccumulatedLoss	27889000
CY2022Q4	nbtb	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	217
CY2022Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions12 Months Or Longer Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositions12MonthsOrLongerFairValue	349496000
CY2022Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions12 Months Or Longer Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositions12MonthsOrLongerAccumulatedLoss	79190000
CY2022Q4	nbtb	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	101
CY2022Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Fair Value DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsFairValue	743284000
CY2022Q4	nbtb	Debt Securities Held To Maturity Continuous Unrealized Loss Positions Accumulated Loss DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionsAccumulatedLoss	107079000
CY2022Q4	nbtb	Debt Securities Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions DebtSecuritiesHeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	318
CY2023	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	2134000
CY2022	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	1315000
CY2023Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	1087000
CY2022Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	2516000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	388
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	415
CY2023Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	3900000
CY2022Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	4200000
CY2022Q4	us-gaap	Debt Securities Held To Maturity Nonaccrual DebtSecuritiesHeldToMaturityNonaccrual	0
CY2023Q4	us-gaap	Debt Securities Held To Maturity Nonaccrual DebtSecuritiesHeldToMaturityNonaccrual	0
CY2023	nbtb	Debt Securities Held To Maturity Accrued Interest Receivables Reversed DebtSecuritiesHeldToMaturityAccruedInterestReceivablesReversed	0
CY2022	nbtb	Debt Securities Held To Maturity Accrued Interest Receivables Reversed DebtSecuritiesHeldToMaturityAccruedInterestReceivablesReversed	0
CY2023Q4	nbtb	Debt Securities Held To Maturity Collateral Dependent DebtSecuritiesHeldToMaturityCollateralDependent	0
CY2022Q4	nbtb	Debt Securities Held To Maturity Collateral Dependent DebtSecuritiesHeldToMaturityCollateralDependent	0
CY2023Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss	4700000
CY2022Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss	3800000
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	9650713000
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	8150147000
CY2023Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	-98200000
CY2022Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	-109100000
CY2023Q4	nbtb	Loans Serviced For Others LoansServicedForOthers	856900000
CY2022Q4	nbtb	Loans Serviced For Others LoansServicedForOthers	592700000
CY2023Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	1000000
CY2022Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	600000
CY2022Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	2516000
CY2021Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	3292000
CY2023	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	705000
CY2022	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	576000
CY2023	nbtb	Loans And Leases Receivable Related Parties Composition Period Increase Decrease LoansAndLeasesReceivableRelatedPartiesCompositionPeriodIncreaseDecrease	0
CY2022	nbtb	Loans And Leases Receivable Related Parties Composition Period Increase Decrease LoansAndLeasesReceivableRelatedPartiesCompositionPeriodIncreaseDecrease	-37000
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	114400000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	100800000
CY2023Q4	srt	Financing Receivable Allowance For Credit Loss To Outstanding Percent FinancingReceivableAllowanceForCreditLossToOutstandingPercent	0.0119
CY2022Q4	srt	Financing Receivable Allowance For Credit Loss To Outstanding Percent FinancingReceivableAllowanceForCreditLossToOutstandingPercent	0.0124
CY2022	nbtb	Loans Purchased With Credit Deterioration LoansPurchasedWithCreditDeterioration	0
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Purchased With Credit Deterioration Allowance For Credit Loss At Acquisition Date FinancingReceivableExcludingAccruedInterestPurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate	31000
CY2022	us-gaap	Financing Receivable Excluding Accrued Interest Purchased With Credit Deterioration Allowance For Credit Loss At Acquisition Date FinancingReceivableExcludingAccruedInterestPurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate	3200000
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	92000000
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	18643000
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	10296000
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	17147000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	100800000
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	110000000
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	20106000
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	10363000
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-8257000
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	92000000
CY2023Q4	nbtb	Financing Receivable Individually Evaluated For Impairment Number Of Relationships FinancingReceivableIndividuallyEvaluatedForImpairmentNumberOfRelationships	2
CY2023Q4	nbtb	Loans And Leases Receivable Individually Evaluated For Impairment LoansAndLeasesReceivableIndividuallyEvaluatedForImpairment	17300000
CY2023Q4	nbtb	Loans And Leases Receivable Allowance For Credit Losses Individually Evaluated For Impairment LoansAndLeasesReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment	0
CY2022Q4	nbtb	Financing Receivable Individually Evaluated For Impairment Number Of Relationships FinancingReceivableIndividuallyEvaluatedForImpairmentNumberOfRelationships	2
CY2022Q4	nbtb	Loans And Leases Receivable Individually Evaluated For Impairment LoansAndLeasesReceivableIndividuallyEvaluatedForImpairment	2400000
CY2022Q4	nbtb	Loans And Leases Receivable Allowance For Credit Losses Individually Evaluated For Impairment LoansAndLeasesReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment	0
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	34213000
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	9650713000
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	17233000
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	8150147000
CY2023Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	17300000
CY2022Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	1100000
CY2023	nbtb	Threshold Period Past Due For Loans To Be Considered Nonperforming ThresholdPeriodPastDueForLoansToBeConsideredNonperforming	P90D
CY2023Q4	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	1444621000
CY2023Q4	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	1989711000
CY2023Q4	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	1688309000
CY2023Q4	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	1019863000
CY2023Q4	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	692961000
CY2023Q4	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	1840266000
CY2023Q4	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	920868000
CY2023Q4	us-gaap	Financing Receivable Revolving Converted To Term Loan FinancingReceivableRevolvingConvertedToTermLoan	54114000
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	9650713000
CY2023	us-gaap	Financing Receivable Year One Originated Current Fiscal Year Writeoff FinancingReceivableYearOneOriginatedCurrentFiscalYearWriteoff	1161000
CY2023	us-gaap	Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff FinancingReceivableYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff	9878000
CY2023	us-gaap	Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff FinancingReceivableYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff	9586000
CY2023	us-gaap	Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff FinancingReceivableYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff	1830000
CY2023	us-gaap	Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff FinancingReceivableYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff	1805000
CY2023	us-gaap	Financing Receivable Originated More Than Five Years Before Current Fiscal Year Writeoff FinancingReceivableOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff	2518000
CY2023	us-gaap	Financing Receivable Revolving Writeoff FinancingReceivableRevolvingWriteoff	0
CY2023	us-gaap	Financing Receivable Revolving Converted To Term Loan Writeoff FinancingReceivableRevolvingConvertedToTermLoanWriteoff	0
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	26778000
CY2022Q4	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	1952599000
CY2022Q4	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	1615395000
CY2022Q4	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	1012149000
CY2022Q4	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	774792000
CY2022Q4	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	518993000
CY2022Q4	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	1414638000
CY2022Q4	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	800156000
CY2022Q4	us-gaap	Financing Receivable Revolving Converted To Term Loan FinancingReceivableRevolvingConvertedToTermLoan	61425000
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	8150147000
CY2022	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	10
CY2022	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	829000
CY2022	nbtb	Financing Receivable Modifications Post Modification Recorded Investment1 FinancingReceivableModificationsPostModificationRecordedInvestment1	928000
CY2022	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	53
CY2022	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	3727000
CY2021	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	52
CY2021	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	2866000
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	243492000
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	189809000
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	162817000
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	120762000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	80675000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	69047000
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	26700000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	28200000
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	23900000
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	25600000
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	6843000
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	6643000
CY2023	us-gaap	Variable Lease Cost VariableLeaseCost	2457000
CY2022	us-gaap	Variable Lease Cost VariableLeaseCost	2041000
CY2023	us-gaap	Short Term Lease Cost ShortTermLeaseCost	415000
CY2022	us-gaap	Short Term Lease Cost ShortTermLeaseCost	297000
CY2023	us-gaap	Sublease Income SubleaseIncome	286000
CY2022	us-gaap	Sublease Income SubleaseIncome	266000
CY2023	us-gaap	Lease Cost LeaseCost	9429000
CY2022	us-gaap	Lease Cost LeaseCost	8715000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	7102000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5778000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4856000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4065000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	2739000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	7528000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	32068000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	3842000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	28226000
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y6M18D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y5M1D
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0368
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.031
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	6138000
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	8371000
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	8797000
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	7377000
CY2023	nbtb	Operating Lease Expense Net OperatingLeaseExpenseNet	7900000
CY2022	nbtb	Operating Lease Expense Net OperatingLeaseExpenseNet	7200000
CY2021	nbtb	Operating Lease Expense Net OperatingLeaseExpenseNet	7200000
CY2022Q4	us-gaap	Goodwill Goodwill	281204000
CY2023	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	80647000
CY2023Q4	us-gaap	Goodwill Goodwill	361851000
CY2021Q4	us-gaap	Goodwill Goodwill	280541000
CY2022	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	663000
CY2022Q4	us-gaap	Goodwill Goodwill	281204000
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	63014000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	31340000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	22571000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	23999000
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	40443000
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7341000
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4700000
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2300000
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2800000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	8100000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	7100000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	6200000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	5200000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	4200000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	9700000
CY2023	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0
CY2022	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0
CY2021	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0
CY2023Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	1206689000
CY2023Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	57989000
CY2023Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	32950000
CY2023Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	19217000
CY2023Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	7209000
CY2023Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	655000
CY2023Q4	us-gaap	Time Deposits TimeDeposits	1324709000
CY2023Q4	nbtb	Time Deposits250000 Or More TimeDeposits250000OrMore	263100000
CY2022Q4	nbtb	Time Deposits250000 Or More TimeDeposits250000OrMore	48400000
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	386700000
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	585000000
CY2023Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	2870000000
CY2022Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	2900000000
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From One To Two Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate	26603000
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate One To Two Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate	0.0435
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Two To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate	1519000
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Two To Three Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate	0.0439
CY2023Q4	nbtb	Federal Home Loan Bank Advances Maturities Summary Due From Seven To Eight Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromSevenToEightYearsOfBalanceSheetDate	3193000
CY2023Q4	nbtb	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate From Seven To Eight Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFromSevenToEightYearsOfBalanceSheetDate	0.0245
CY2022Q4	nbtb	Federal Home Loan Bank Advances Maturities Summary Due From Eight To Nine Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromEightToNineYearsOfBalanceSheetDate	3296000
CY2022Q4	nbtb	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate From Eight To Nine Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFromEightToNineYearsOfBalanceSheetDate	0.0245
CY2023Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	29796000
CY2022Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	4815000
CY2023Q4	nbtb	Number Of Statutory Business Trusts Included In Trusts NumberOfStatutoryBusinessTrustsIncludedInTrusts	5
CY2023Q4	nbtb	Minimum Assets For Bank Holding Companies To Be Subject To Same Capital Requirements As Insured Depository Institutions MinimumAssetsForBankHoldingCompaniesToBeSubjectToSameCapitalRequirementsAsInsuredDepositoryInstitutions	500000000
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	22829000
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	51077000
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	35483000
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5890000
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	12934000
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	8626000
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	28719000
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	64011000
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	44109000
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	4593000
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-15862000
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	507000
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1365000
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-3988000
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	357000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	5958000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-19850000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	864000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34677000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44161000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44973000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	28039000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	24792000
CY2023Q4	nbtb	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	6917000
CY2022Q4	nbtb	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	6273000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	9915000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	9181000
CY2023Q4	nbtb	Deferred Tax Assets Purchase Accounting Fair Value Adjustments DeferredTaxAssetsPurchaseAccountingFairValueAdjustments	18306000
CY2022Q4	nbtb	Deferred Tax Assets Purchase Accounting Fair Value Adjustments DeferredTaxAssetsPurchaseAccountingFairValueAdjustments	125000
CY2023Q4	nbtb	Deferred Tax Assets Tax Deferred Expense Loan Fees DeferredTaxAssetsTaxDeferredExpenseLoanFees	30778000
CY2022Q4	nbtb	Deferred Tax Assets Tax Deferred Expense Loan Fees DeferredTaxAssetsTaxDeferredExpenseLoanFees	33389000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	3006000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2822000
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5732000
CY2023Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Trading Securities DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	45446000
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Trading Securities DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	53663000
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	9362000
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5902000
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	151769000
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	136147000
CY2023Q4	nbtb	Deferred Tax Liabilities Pension And Executive Retirement DeferredTaxLiabilitiesPensionAndExecutiveRetirement	14742000
CY2022Q4	nbtb	Deferred Tax Liabilities Pension And Executive Retirement DeferredTaxLiabilitiesPensionAndExecutiveRetirement	13103000
CY2023Q4	nbtb	Deferred Tax Liabilities Lease Right Of Use Asset DeferredTaxLiabilitiesLeaseRightOfUseAsset	6551000
CY2022Q4	nbtb	Deferred Tax Liabilities Lease Right Of Use Asset DeferredTaxLiabilitiesLeaseRightOfUseAsset	5877000
CY2023Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	22850000
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	14112000
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2746000
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	4889000
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1669000
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	846000
CY2023Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	48558000
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	38827000
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	103211000
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	97320000
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	97320000
CY2021Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	22038000
CY2023	nbtb	Deferred Tax Assets Liabilities Net Increase Decrease In Net Deferred Tax Asset DeferredTaxAssetsLiabilitiesNetIncreaseDecreaseInNetDeferredTaxAsset	5891000
CY2022	nbtb	Deferred Tax Assets Liabilities Net Increase Decrease In Net Deferred Tax Asset DeferredTaxAssetsLiabilitiesNetIncreaseDecreaseInNetDeferredTaxAsset	75282000
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	32226000
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	41193000
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	41971000
CY2023	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	1442000
CY2022	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	984000
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	1014000
CY2023	nbtb	Effective Income Tax Rate Reconciliation Net Increase In Cash Surrender Value Of Life Insurance Amount EffectiveIncomeTaxRateReconciliationNetIncreaseInCashSurrenderValueOfLifeInsuranceAmount	1367000
CY2022	nbtb	Effective Income Tax Rate Reconciliation Net Increase In Cash Surrender Value Of Life Insurance Amount EffectiveIncomeTaxRateReconciliationNetIncreaseInCashSurrenderValueOfLifeInsuranceAmount	1215000
CY2021	nbtb	Effective Income Tax Rate Reconciliation Net Increase In Cash Surrender Value Of Life Insurance Amount EffectiveIncomeTaxRateReconciliationNetIncreaseInCashSurrenderValueOfLifeInsuranceAmount	1230000
CY2023	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	2855000
CY2022	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	2417000
CY2021	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	1884000
CY2023Q4	nbtb	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Plan Assets DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnPlanAssets	0.067
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	7067000
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	7097000
CY2023	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2383000
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	517000
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	33000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34677000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44161000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44973000
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1942000
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1545000
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	647000
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3000
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	104000
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	394000
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	394000
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2879000
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1942000
CY2023Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2274000
CY2022Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1535000
CY2023	nbtb	Transition Obligation Period Of Recognition TransitionObligationPeriodOfRecognition	P20Y
CY2022Q4	nbtb	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Plan Assets DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnPlanAssets	0.067
CY2021Q4	nbtb	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Plan Assets DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnPlanAssets	0.067
CY2023Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.03
CY2022Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.03
CY2021Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.03
CY2023Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate	0.0466
CY2022Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate	0.0399
CY2021Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate	0.0194
CY2023	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.067
CY2022	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.067
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.07
CY2023	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.03
CY2022	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.03
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.03
CY2023	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostWeightedAverageInterestCreditingRate	0.0399
CY2022	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostWeightedAverageInterestCreditingRate	0.0194
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostWeightedAverageInterestCreditingRate	0.0162
CY2023Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.04
CY2023Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2022Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2023Q4	nbtb	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Plan Assets DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnPlanAssets	0.067
CY2022Q4	nbtb	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Plan Assets DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnPlanAssets	0.067
CY2023Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	900000
CY2022Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	1100000
CY2022	us-gaap	Other Postretirement Benefit Expense OtherPostretirementBenefitExpense	200000
CY2023	us-gaap	Other Postretirement Benefit Expense OtherPostretirementBenefitExpense	200000
CY2021	us-gaap	Other Postretirement Benefit Expense OtherPostretirementBenefitExpense	200000
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	182418
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	21983000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	26435000
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	16269000
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-138951000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-163599000
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-7075000
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-160934000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-190034000
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-23344000
CY2023	nbtb	Preceding Period Of Retained Net Profits For Approval Of Office Of Comptroller Of Currency PrecedingPeriodOfRetainedNetProfitsForApprovalOfOfficeOfComptrollerOfCurrency	P2Y
CY2023Q4	us-gaap	Statutory Accounting Practices Statutory Amount Available For Dividend Payments StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments	106600000
CY2023	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	155500
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	4900000
CY2023	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	31.79
CY2023Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	2000000
CY2023Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	2000000
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CY2023Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	1301560000
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CY2023Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.05
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CY2023Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.045
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CY2023Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.125
CY2023Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.06
CY2023Q4	nbtb	Tier One Risk Based Capital Required For Capital Adequacy Plus Buffer To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyPlusBufferToRiskWeightedAssets	0.085
CY2023Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.08
CY2023Q4	us-gaap	Capital Capital	1534826000
CY2023Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1475
CY2023Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.08
CY2023Q4	nbtb	Capital Required For Capital Adequacy Plus Buffer To Risk Weighted Assets CapitalRequiredForCapitalAdequacyPlusBufferToRiskWeightedAssets	0.105
CY2023Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10
CY2022Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	1193336000
CY2022Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1032
CY2022Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.04
CY2022Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.05
CY2022Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	1096336000
CY2022Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.1212
CY2022Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.045
CY2022Q4	nbtb	Common Equity Tier One Risk Based Capital To Risk Weighted Assets Required For Capital Adequacy Plus Buffer CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssetsRequiredForCapitalAdequacyPlusBuffer	0.07
CY2022Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Well Capitalized Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum	0.065
CY2022Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	1193336000
CY2022Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1319
CY2022Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.06
CY2022Q4	nbtb	Tier One Risk Based Capital Required For Capital Adequacy Plus Buffer To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyPlusBufferToRiskWeightedAssets	0.085
CY2022Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.08
CY2022Q4	us-gaap	Capital Capital	1391182000
CY2022Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1538
CY2022Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.08
CY2022Q4	nbtb	Capital Required For Capital Adequacy Plus Buffer To Risk Weighted Assets CapitalRequiredForCapitalAdequacyPlusBufferToRiskWeightedAssets	0.105
CY2022Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10
CY2023	us-gaap	Net Income Loss NetIncomeLoss	118782000
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44528000
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.67
CY2022	us-gaap	Net Income Loss NetIncomeLoss	151995000
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42917000
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.54
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154885000
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43421000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.57
CY2023	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	242000
CY2022	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	264000
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	298000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	118782000
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44770000
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.65
CY2022	us-gaap	Net Income Loss NetIncomeLoss	151995000
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43181000
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.52
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154885000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43719000
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.54
CY2023Q4	nbtb	Percentage Of Companys Loans Secured By Real Estate PercentageOfCompanysLoansSecuredByRealEstate	0.63
CY2023	nbtb	Guarantor Obligations Period GuarantorObligationsPeriod	P1Y
CY2023	nbtb	Maintenance Period Basis Federal Reserve Bank MaintenancePeriodBasisFederalReserveBank	P14D
CY2023Q4	nbtb	Average Reserve Balances With Federal Reserve Bank AverageReserveBalancesWithFederalReserveBank	99600000
CY2023Q4	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false

Files In Submission

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$NBTB
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2024 Q1 Form 10-K Financial Statement

#000114036124010464 Filed on February 29, 2024

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$NBTB NBT BANCORP INC Stock $nbtb

2024 Q1 Form 10-K Financial Statement

#000114036124010464 Filed on February 29, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NBTB
NBT BANCORP INC Stock $nbtb