$NBTB
NBT BANCORP INC Stock $nbtb

$nbtb Overview Financials Valuation SEC Filings Company Website

2023 Q1 Form 10-K Financial Statement

#000114036123009417 Filed on March 01, 2023

Income Statement

Concept	2023 Q1	2022 Q4	2022
Revenue	$114.2M		$150.7M
YoY Change	35.62%		-55.67%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development	$9.007M		$35.71M
YoY Change	5.38%		110.21%
% of Gross Profit
Depreciation & Amortization	$3.115M	$3.112M	$12.42M
YoY Change	1.93%	-2.75%	-2.22%
% of Gross Profit
Operating Expenses	$9.007M		$35.71M
YoY Change	5.38%		110.21%
Operating Profit
YoY Change
Interest Expense	$19.13M		$21.88M
YoY Change	396.39%		16.46%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$43.24M	$46.68M	$196.2M
YoY Change	-13.97%	-2.94%	-1.85%
Income Tax	$9.586M	$10.56M	$44.16M
% Of Pretax Income	22.17%	22.63%	22.51%
Net Earnings	$33.66M	$36.12M	$152.0M
YoY Change	-13.98%	-3.16%	-1.87%
Net Earnings / Revenue	29.47%		100.88%
Basic Earnings Per Share	$0.78		$3.54
Diluted Earnings Per Share	$0.78	$837.2K	$3.520M
COMMON SHARES
Basic Shares Outstanding	42.90M	42.84M	42.92M
Diluted Shares Outstanding	42.89M		43.18M

Balance Sheet

Concept	2023 Q1	2022 Q4	2022
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$229.8M	$197.4M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$67.87M	$69.05M	$69.05M
YoY Change	-4.45%	-4.23%	-27.32%
Goodwill	$281.2M	$281.2M
YoY Change		0.24%
Intangibles	$6.955M	$7.341M
YoY Change		-17.77%
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	$11.84B	$11.74B	$11.74B
YoY Change	-2.54%	-2.27%	-2.27%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses			$25.60M
YoY Change			-8.57%
Deferred Revenue
YoY Change
Short-Term Debt	$475.2M	$585.0M	$585.0M
YoY Change	630.87%	498.19%	496.95%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$475.2M	$585.0M	$25.60M
YoY Change	630.87%	496.95%	-8.57%
LONG-TERM LIABILITIES
Long-Term Debt	$228.0M	$202.9M	$202.9M
YoY Change	6.67%	-5.17%	-5.17%
Other Long-Term Liabilities	$243.6M	$281.9M	$281.9M
YoY Change	18.74%	30.49%	49.93%
Total Long-Term Liabilities	$471.6M	$484.8M	$484.8M
YoY Change	12.58%	12.74%	20.6%
TOTAL LIABILITIES
Total Short-Term Liabilities	$475.2M	$585.0M	$25.60M
Total Long-Term Liabilities	$471.6M	$484.8M	$484.8M
Total Liabilities	$10.63B	$10.57B	$10.57B
YoY Change	-2.9%	-1.82%	-1.82%
SHAREHOLDERS EQUITY
Retained Earnings	$979.7M	$958.4M
YoY Change		11.94%
Common Stock	$497.0K	$497.0K
YoY Change		0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.212B	$1.174B	$1.174B
YoY Change
Total Liabilities & Shareholders Equity	$11.84B	$11.74B	$11.74B
YoY Change	-2.54%	-2.27%	-2.27%

Cashflow Statement

Concept	2023 Q1	2022 Q4	2022
OPERATING ACTIVITIES
Net Income	$33.66M	$36.12M	$152.0M
YoY Change	-13.98%	-3.16%	-1.87%
Depreciation, Depletion And Amortization	$3.115M	$3.112M	$12.42M
YoY Change	1.93%	-2.75%	-2.22%
Cash From Operating Activities	$21.85M	$29.70M	$183.2M
YoY Change	-37.84%	33.19%	16.23%
INVESTING ACTIVITIES
Capital Expenditures	$1.392M	$2.260M	$7.009M
YoY Change	-206.1%	-183.7%	-191.03%
Acquisitions	$129.0K		$2.616M
YoY Change	-50.38%
Other Investing Activities	-$74.17M	-$225.0M	-$919.2M
YoY Change	-80.57%	98.61%	70.76%
Cash From Investing Activities	-$75.56M	-$227.3M	-$926.2M
YoY Change	-80.27%	95.76%	69.62%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	86.16M	73.87M	-328.7M
YoY Change	-50.17%	345.0%	-133.38%
NET CHANGE
Cash From Operating Activities	21.85M	29.70M	183.2M
Cash From Investing Activities	-75.56M	-227.3M	-926.2M
Cash From Financing Activities	86.16M	73.87M	-328.7M
Net Change In Cash	32.45M	-123.7M	-1.072B
YoY Change	-118.55%	60.24%	-279.7%
FREE CASH FLOW
Cash From Operating Activities	$21.85M	$29.70M	$183.2M
Capital Expenditures	$1.392M	$2.260M	$7.009M
Free Cash Flow	$20.46M	$27.44M	$176.2M
YoY Change	-43.89%	9.77%	6.58%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2021Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	157775000
CY2022Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	30862000
CY2021Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	33550000
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1527225000
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1687361000
CY2022Q4	us-gaap	Notes Receivable Net NotesReceivableNet	8049347000
CY2021Q4	us-gaap	Notes Receivable Net NotesReceivableNet	7406459000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	69047000
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	72093000
CY2022Q4	us-gaap	Goodwill Goodwill	281204000
CY2021Q4	us-gaap	Goodwill Goodwill	280541000
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7341000
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8927000
CY2022Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	232409000
CY2021Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	228238000
CY2022Q4	us-gaap	Other Assets OtherAssets	379797000
CY2021Q4	us-gaap	Other Assets OtherAssets	266733000
CY2022Q4	us-gaap	Assets Assets	11739296000
CY2021Q4	us-gaap	Assets Assets	12012111000
CY2022Q4	nbtb	Savings Now And Money Market SavingsNowAndMoneyMarket	5444837000
CY2021Q4	nbtb	Savings Now And Money Market SavingsNowAndMoneyMarket	6043441000
CY2022Q4	us-gaap	Time Deposits TimeDeposits	433772000
CY2022Q4	us-gaap	Deposits Deposits	9495933000
CY2021Q4	us-gaap	Deposits Deposits	10234469000
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	585012000
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	97795000
CY2022Q4	nbtb	Long Term Debt Excluding Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust And Subordinated Debt LongTermDebtExcludingJuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustAndSubordinatedDebt	4815000
CY2021Q4	nbtb	Long Term Debt Excluding Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust And Subordinated Debt LongTermDebtExcludingJuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustAndSubordinatedDebt	13995000
CY2022Q4	us-gaap	Subordinated Debt SubordinatedDebt	96927000
CY2021Q4	us-gaap	Subordinated Debt SubordinatedDebt	98490000
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	215713000
CY2022Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2500000
CY2022Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2500000
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	0
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	49651493
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	49651493
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	497000
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	497000
CY2022Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	577853000
CY2021Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	576976000
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	958433000
CY2022	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	332768000
CY2021	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	302175000
CY2020	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	307859000
CY2022	us-gaap	Interest Income Debt Securities Available For Sale Operating InterestIncomeDebtSecuritiesAvailableForSaleOperating	29653000
CY2021	us-gaap	Interest Income Debt Securities Available For Sale Operating InterestIncomeDebtSecuritiesAvailableForSaleOperating	23305000
CY2020	us-gaap	Interest Income Debt Securities Available For Sale Operating InterestIncomeDebtSecuritiesAvailableForSaleOperating	22434000
CY2022	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	17582000
CY2021	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	12551000
CY2020	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	15283000
CY2022	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	4067000
CY2021	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	1845000
CY2020	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	2706000
CY2022	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	384070000
CY2021	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	339876000
CY2021	nbtb	Wealth Management WealthManagement	33718000
CY2022	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	2623000
CY2021	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	158000
CY2020	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	3408000
CY2022	nbtb	Interest Expense Long Term Debt Excluding Junior Subordinated Debentures InterestExpenseLongTermDebtExcludingJuniorSubordinatedDebentures	161000
CY2021	nbtb	Interest Expense Long Term Debt Excluding Junior Subordinated Debentures InterestExpenseLongTermDebtExcludingJuniorSubordinatedDebentures	389000
CY2020	nbtb	Interest Expense Long Term Debt Excluding Junior Subordinated Debentures InterestExpenseLongTermDebtExcludingJuniorSubordinatedDebentures	1553000
CY2022	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	5424000
CY2021	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	5437000
CY2020	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	2842000
CY2022	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	3749000
CY2021	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	2090000
CY2020	us-gaap	Interest Expense Junior Subordinated Debentures InterestExpenseJuniorSubordinatedDebentures	2731000
CY2022	us-gaap	Interest Expense InterestExpense	21880000
CY2022	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	345043000
CY2021	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	329345000
CY2020	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	264544000
CY2022	nbtb	Service Charges On Deposit Accounts ServiceChargesOnDepositAccounts	14630000
CY2021	nbtb	Service Charges On Deposit Accounts ServiceChargesOnDepositAccounts	13348000
CY2020	nbtb	Service Charges On Deposit Accounts ServiceChargesOnDepositAccounts	13201000
CY2022	nbtb	Retirement Plan Administration Fees RetirementPlanAdministrationFees	48112000
CY2021	nbtb	Retirement Plan Administration Fees RetirementPlanAdministrationFees	42188000
CY2020	nbtb	Retirement Plan Administration Fees RetirementPlanAdministrationFees	35851000
CY2022	us-gaap	Insurance Agency Management Fee InsuranceAgencyManagementFee	14696000
CY2021	us-gaap	Insurance Agency Management Fee InsuranceAgencyManagementFee	14083000
CY2022	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6044000
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6217000
CY2020	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	5743000
CY2021	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	566000
CY2020	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-388000
CY2022	us-gaap	Labor And Related Expense LaborAndRelatedExpense	187830000
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	172580000
CY2022	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	6140000
CY2021	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	6006000
CY2020	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	6138000
CY2022	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3197000
CY2021	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3041000
CY2020	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	2688000
CY2022	us-gaap	Advertising Expense AdvertisingExpense	2822000
CY2021	us-gaap	Advertising Expense AdvertisingExpense	2521000
CY2020	us-gaap	Advertising Expense AdvertisingExpense	2288000
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2263000
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2808000
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3395000
CY2022	nbtb	Loan Collection And Other Real Estate Owned LoanCollectionAndOtherRealEstateOwned	2647000
CY2021	nbtb	Loan Collection And Other Real Estate Owned LoanCollectionAndOtherRealEstateOwned	2915000
CY2020	nbtb	Loan Collection And Other Real Estate Owned LoanCollectionAndOtherRealEstateOwned	3295000
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	19795000
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	20339000
CY2020	us-gaap	Other Noninterest Expense OtherNoninterestExpense	24863000
CY2022	us-gaap	Noninterest Expense NoninterestExpense	304465000
CY2021	us-gaap	Noninterest Expense NoninterestExpense	287281000
CY2020	us-gaap	Noninterest Expense NoninterestExpense	277733000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	196156000
CY2022	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesTax	128000
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000
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
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	2000
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
CY2020	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesTax	161000
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
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
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	0
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	0
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-275000
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-69000
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	0
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-206000
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
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-296000
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
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-74000
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
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-222000
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
CY2020	us-gaap	Dividends Cash DividendsCash	47207000
CY2020	nbtb	Stock Issued During Period Shares Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodSharesEmployeeBenefitPlansAndOtherStockPlans	95990
CY2020	nbtb	Stock Issued During Period Value Employee Benefit Plans And Other Stock Plans StockIssuedDuringPeriodValueEmployeeBenefitPlansAndOtherStockPlans	-1665000
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4581000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	19443000
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	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
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	1173554000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	151995000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154885000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	104388000
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	17147000
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-8257000
CY2020	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	51134000
CY2022	us-gaap	Depreciation Nonproduction DepreciationNonproduction	10155000
CY2021	us-gaap	Depreciation Nonproduction DepreciationNonproduction	9896000
CY2020	us-gaap	Depreciation Nonproduction DepreciationNonproduction	9772000
CY2022	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-3460000
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-5832000
CY2020	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-4369000
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2263000
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2808000
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3395000
CY2020	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	7382000
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	4530000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	4414000
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	4581000
CY2022	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6044000
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6217000
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
CY2020	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	168707000
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
CY2020	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	158279000
CY2022	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	0
CY2021	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	0
CY2020	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	-4284000
CY2022	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	7918000
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	11117000
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	47069000
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	145273000
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
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	6760000
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
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	336410000
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	689932000
CY2020	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	230951000
CY2022	nbtb	Proceeds From Calls Of Equity Securities ProceedsFromCallsOfEquitySecurities	0
CY2021	nbtb	Proceeds From Calls Of Equity Securities ProceedsFromCallsOfEquitySecurities	1000000
CY2020	nbtb	Proceeds From Calls Of Equity Securities ProceedsFromCallsOfEquitySecurities	2000000
CY2021	nbtb	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	0
CY2020	nbtb	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	0
CY2022	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	659949000
CY2021	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	9305000
CY2020	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	378765000
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
CY2020	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	63305000
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
CY2020	nbtb	Payments To Acquire Federal Reserve Bank Stock And Federal Home Loan Bank Stock PaymentsToAcquireFederalReserveBankStockAndFederalHomeLoanBankStock	46038000
CY2022	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1873000
CY2021	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	4413000
CY2020	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1057000
CY2022	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	0
CY2021	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	40000000
CY2020	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	0
CY2022	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	7009000
CY2021	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	7740000
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	8157000
CY2022	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	426000
CY2021	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	1290000
CY2020	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	1113000
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
CY2020	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	25114000
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
CY2020	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	184000
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
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1537000
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	14713000
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	21714000
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	7980000
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	49765000
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	47738000
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	47207000
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
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1023151000
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
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	455838000
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
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	216843000
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
CY2022	us-gaap	Interest Paid Net InterestPaidNet	20608000
CY2021	us-gaap	Interest Paid Net InterestPaidNet	20285000
CY2021Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	1111296000
CY2021Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherAssets
CY2022Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherAssets
CY2022Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherAssets
CY2021Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherAssets
CY2021Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List FinancingReceivableAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherAssets
CY2022	dei	Document Type DocumentType	10-K
CY2022	dei	Document Annual Report DocumentAnnualReport	true
CY2022Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List FinancingReceivableAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherAssets
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherAssets
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherAssets
CY2021Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherLiabilities
CY2022Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherLiabilities
CY2022	dei	Auditor Firm AuditorFirmId	185
CY2022	dei	Document Period End Date DocumentPeriodEndDate	2022-12-31
CY2022	dei	Entity File Number EntityFileNumber	0-14703
CY2022	dei	Entity Registrant Name EntityRegistrantName	NBT BANCORP INC
CY2022	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2022	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	16-1268674
CY2022	dei	Entity Address Address Line1 EntityAddressAddressLine1	52 South Broad Street
CY2022	dei	Entity Address City Or Town EntityAddressCityOrTown	Norwich
CY2022	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2022	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	13815
CY2022	dei	City Area Code CityAreaCode	607
CY2022	dei	Local Phone Number LocalPhoneNumber	337-2265
CY2022	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
CY2022	dei	Trading Symbol TradingSymbol	NBTB
CY2022	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2022	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2022	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2022	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2022	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2022	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2022	dei	Entity Small Business EntitySmallBusiness	false
CY2022	dei	Amendment Flag AmendmentFlag	false
CY2022	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2022	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
CY2022	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2022	dei	Entity Central Index Key EntityCentralIndexKey	0000790359
CY2022	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2022	dei	Document Transition Report DocumentTransitionReport	false
CY2022	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2022	dei	Entity Shell Company EntityShellCompany	false
CY2022Q2	dei	Entity Public Float EntityPublicFloat	1558025644
CY2023Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	42901522
CY2022	dei	Auditor Name AuditorName	KPMG LLP
CY2022	dei	Auditor Location AuditorLocation	Albany, New York
CY2022Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	166488000
CY2020	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	19254000
CY2022	us-gaap	Noninterest Income NoninterestIncome	155578000
CY2021	us-gaap	Noninterest Income NoninterestIncome	157794000
CY2022Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	30784000
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	812647000
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	735260000
CY2022Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	919517000
CY2021Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	733210000
CY2022Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	44713000
CY2021Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	25098000
CY2022Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	562000
CY2021Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	830000
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	8150147000
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	7498459000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	100800000
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	92000000
CY2022Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	3617324000
CY2021Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	3689556000
CY2021Q4	us-gaap	Time Deposits TimeDeposits	501472000
CY2022Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	101196000
CY2021Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	101196000
CY2022Q4	us-gaap	Other Liabilities OtherLiabilities	281859000
CY2022Q4	us-gaap	Liabilities Liabilities	10565742000
CY2021Q4	us-gaap	Liabilities Liabilities	10761658000
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Preferred Stock Value PreferredStockValue	0
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	856203000
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
CY2022Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	6793670
CY2021Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	6483481
CY2022Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	173195000
CY2021Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	159879000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	1173554000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	1250453000
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	11739296000
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	12012111000
CY2020	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	348282000
CY2022	us-gaap	Interest Expense Deposits InterestExpenseDeposits	9923000
CY2021	us-gaap	Interest Expense Deposits InterestExpenseDeposits	10714000
CY2020	us-gaap	Interest Expense Deposits InterestExpenseDeposits	22070000
CY2021	us-gaap	Interest Expense InterestExpense	18788000
CY2020	us-gaap	Interest Expense InterestExpense	32604000
CY2022	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	362190000
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	321088000
CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	315678000
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	17147000
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-8257000
CY2020	us-gaap	Noninterest Income NoninterestIncome	146276000
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	161934000
CY2022	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	35712000
CY2021	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	34717000
CY2020	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	32294000
CY2022	us-gaap	Occupancy Net OccupancyNet	26282000
CY2021	us-gaap	Occupancy Net OccupancyNet	26048000
CY2020	us-gaap	Occupancy Net OccupancyNet	25756000
CY2022	us-gaap	Professional Fees ProfessionalFees	16810000
CY2021	us-gaap	Professional Fees ProfessionalFees	16306000
CY2020	us-gaap	Professional Fees ProfessionalFees	15082000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	199858000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	133087000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44161000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44973000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28699000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	151995000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154885000
CY2020	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	51134000
CY2022	nbtb	Card Services Income CardServicesIncome	29058000
CY2021	nbtb	Card Services Income CardServicesIncome	34682000
CY2020	nbtb	Card Services Income CardServicesIncome	28611000
CY2022	nbtb	Wealth Management WealthManagement	33311000
CY2020	nbtb	Wealth Management WealthManagement	29247000
CY2020	us-gaap	Insurance Agency Management Fee InsuranceAgencyManagementFee	14757000
CY2022	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-1131000
CY2022	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	10858000
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	12992000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	104388000
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.54
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.57
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.39
CY2022	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	967000
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.52
CY2021	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	0
CY2020	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	0
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.54
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.37
CY2022	us-gaap	Net Income Loss NetIncomeLoss	151995000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154885000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	104388000
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
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	23204000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	104388000
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
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	5800000
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
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	17404000
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
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	3000
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
CY2020	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Before Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesBeforeTax	644000
CY2021	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesTax	145000
CY2020	nbtb	Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromAvailableForSaleToHeldToMaturitySecuritiesNetOfTax	483000
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	17885000
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	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
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	16000
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
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	1627000
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
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	407000
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
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	1220000
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
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	429000
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	107000
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
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	322000
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
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1542000
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
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	19443000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-14695000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	131124000
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	123831000
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1120397000
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.08
CY2020	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	263507
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	7980000
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	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-166690000
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
CY2022	nbtb	Excess Tax Benefit From Share Based Compensation ExcessTaxBenefitFromShareBasedCompensation	288000
CY2021	nbtb	Excess Tax Benefit From Share Based Compensation ExcessTaxBenefitFromShareBasedCompensation	385000
CY2020	nbtb	Excess Tax Benefit From Share Based Compensation ExcessTaxBenefitFromShareBasedCompensation	181000
CY2020	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	5743000
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	437000
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	438000
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	230000
CY2021	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	181000
CY2022	nbtb	Discount On Repurchase Of Debt Instrument DiscountOnRepurchaseOfDebtInstrument	-106000
CY2021	nbtb	Discount On Repurchase Of Debt Instrument DiscountOnRepurchaseOfDebtInstrument	0
CY2020	nbtb	Discount On Repurchase Of Debt Instrument DiscountOnRepurchaseOfDebtInstrument	0
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
CY2020	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	1989000
CY2022	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-1131000
CY2021	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	566000
CY2020	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-388000
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
CY2020	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	96000
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
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
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
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	243136000
CY2022	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	0
CY2021	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	0
CY2020	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	996000
CY2022	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	365033000
CY2021	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	299014000
CY2022	nbtb	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	1000000
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-712586000
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-738536000
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1152777000
CY2020	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1493872000
CY2022	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	487217000
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-70592000
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-486889000
CY2022	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0
CY2021	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0
CY2020	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	100000000
CY2022	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2178000
CY2022	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	2000000
CY2021	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0
CY2020	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0
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
CY2020	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	0
CY2022	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	10699000
CY2021	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	25101000
CY2020	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1017000
CY2022	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	705000
CY2021	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	0
CY2020	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	3328000
CY2021	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0
CY2022	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0
CY2021	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	0
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1064693000
CY2022Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	349496000
CY2022Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	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	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	743284000
CY2022Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	107079000
CY2020	us-gaap	Interest Paid Net InterestPaidNet	31692000
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	62795000
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	46097000
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	45790000
CY2022	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	105000
CY2022Q4	us-gaap	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	318
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	811115000
CY2022	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	0
CY2022	nbtb	Threshold Period Past Due For Loans To Be Considered Nonperforming ThresholdPeriodPastDueForLoansToBeConsideredNonperforming	P90D
CY2022	nbtb	Period Of Sustained Repayment Performance For Nonperforming Tdrs To Be Returned To Performing Status PeriodOfSustainedRepaymentPerformanceForNonperformingTdrsToBeReturnedToPerformingStatus	P6M
CY2022	nbtb	Standby Letters Of Credit Expiration Period StandbyLettersOfCreditExpirationPeriod	P1Y
CY2021	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	0
CY2022	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-1135000
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
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	140921000
CY2022	nbtb	Non Interest Income1 NonInterestIncome1	4913000
CY2021	nbtb	Non Interest Income1 NonInterestIncome1	6783000
CY2020	nbtb	Non Interest Income1 NonInterestIncome1	5355000
CY2022	us-gaap	Noninterest Income NoninterestIncome	155578000
CY2021	us-gaap	Noninterest Income NoninterestIncome	157794000
CY2020	us-gaap	Noninterest Income NoninterestIncome	146276000
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
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1694806000
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	14497000
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	21942000
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1687361000
CY2021Q4	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
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	537000
CY2022Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	1000000
CY2022	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	3000
CY2022	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0
CY2021	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0
CY2020	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0
CY2022	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	3000
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
CY2022	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0
CY2020	nbtb	Gains From Calls On Securities Available For Sale GainsFromCallsOnSecuritiesAvailableForSale	3000
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
CY2021Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	733210000
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	10040000
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	7990000
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	735260000
CY2021Q4	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
CY2022	nbtb	Gains From Calls On Securities Held To Maturity GainsFromCallsOnSecuritiesHeldToMaturity	4000
CY2021	nbtb	Gains From Calls On Securities Held To Maturity GainsFromCallsOnSecuritiesHeldToMaturity	29000
CY2020	nbtb	Gains From Calls On Securities Held To Maturity GainsFromCallsOnSecuritiesHeldToMaturity	24000
CY2020	us-gaap	Debt Securities Held To Maturity Sold Amount DebtSecuritiesHeldToMaturitySoldAmount	1000000
CY2020	nbtb	Debt Securities Held To Maturity Sold Realized Loss DebtSecuritiesHeldToMaturitySoldRealizedLoss	1000
CY2021	us-gaap	Debt Securities Held To Maturity Sold Amount DebtSecuritiesHeldToMaturitySoldAmount	0
CY2022	us-gaap	Debt Securities Held To Maturity Sold Amount DebtSecuritiesHeldToMaturitySoldAmount	0
CY2022	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-1135000
CY2021	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	537000
CY2022	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	0
CY2021Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	1000000
CY2022	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0
CY2021	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 Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	0
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	13238000
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	127
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	682000
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	675000
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	402807000
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	361295000
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	582736000
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	506036000
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	757657000
CY2022Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	659219000
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1743882000
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1527225000
CY2022Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	49986000
CY2022Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	49979000
CY2022Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	92443000
CY2022Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	89979000
CY2022Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	278664000
CY2022Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	241294000
CY2022Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	498424000
CY2022Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	431395000
CY2022Q4	us-gaap	Debt Securities Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	919517000
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	812647000
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
CY2020Q4	nbtb	Number Of Issuers Whose Holdings Exceeded Ten Percent Of Consolidated Stockholders Equity Excluding Us Government Securities NumberOfIssuersWhoseHoldingsExceededTenPercentOfConsolidatedStockholdersEquityExcludingUSGovernmentSecurities	0
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	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	393788000
CY2022Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	27889000
CY2022Q4	nbtb	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	217
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	253578000
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	8704000
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	22
CY2021Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	800000
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	21942000
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	149
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	211184000
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	3311000
CY2021Q4	nbtb	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	56
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	104585000
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	4679000
CY2021Q4	nbtb	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	14
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	315769000
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	7990000
CY2021Q4	us-gaap	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	70
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	415
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	149
CY2022Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	4200000
CY2021Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	3900000
CY2022	nbtb	Debt Securities Held To Maturity Accrued Interest Receivables Reversed DebtSecuritiesHeldToMaturityAccruedInterestReceivablesReversed	0
CY2021	nbtb	Debt Securities Held To Maturity Accrued Interest Receivables Reversed DebtSecuritiesHeldToMaturityAccruedInterestReceivablesReversed	0
CY2022Q4	nbtb	Debt Securities Held To Maturity Collateral Dependent DebtSecuritiesHeldToMaturityCollateralDependent	0
CY2021Q4	nbtb	Debt Securities Held To Maturity Collateral Dependent DebtSecuritiesHeldToMaturityCollateralDependent	0
CY2022Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss	3800000
CY2021Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss	2700000
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	8150147000
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	7498459000
CY2022Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-109100000
CY2021Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-23700000
CY2022Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	600000
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	9945000
CY2022Q4	nbtb	Loans Serviced For Others LoansServicedForOthers	576000000
CY2021Q4	nbtb	Loans Serviced For Others LoansServicedForOthers	575900000
CY2022Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	600000
CY2021Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	1000000
CY2021Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	3292000
CY2020Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	5936000
CY2022	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	576000
CY2021	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	182000
CY2022	nbtb	Loans And Leases Receivable Related Parties Composition Period Increase Decrease LoansAndLeasesReceivableRelatedPartiesCompositionPeriodIncreaseDecrease	-37000
CY2021	nbtb	Loans And Leases Receivable Related Parties Composition Period Increase Decrease LoansAndLeasesReceivableRelatedPartiesCompositionPeriodIncreaseDecrease	-683000
CY2022	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	1315000
CY2021	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	2143000
CY2022Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	2516000
CY2021Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	3292000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	100800000
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	92000000
CY2022Q4	srt	Financing Receivable Allowance For Credit Loss To Outstanding Percent FinancingReceivableAllowanceForCreditLossToOutstandingPercent	0.0124
CY2021Q4	srt	Financing Receivable Allowance For Credit Loss To Outstanding Percent FinancingReceivableAllowanceForCreditLossToOutstandingPercent	0.0123
CY2021	nbtb	Loans Purchased With Credit Deterioration LoansPurchasedWithCreditDeterioration	0
CY2022	nbtb	Loans Purchased With Credit Deterioration LoansPurchasedWithCreditDeterioration	0
CY2022Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses	3200000
CY2021Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses	6800000
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
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	75999000
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	27078000
CY2020	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	51134000
CY2022	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	10
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	110000000
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
CY2021Q4	nbtb	Financing Receivable Individually Evaluated For Impairment Number Of Relationships FinancingReceivableIndividuallyEvaluatedForImpairmentNumberOfRelationships	5
CY2021Q4	nbtb	Loans And Leases Receivable Individually Evaluated For Impairment LoansAndLeasesReceivableIndividuallyEvaluatedForImpairment	10200000
CY2021Q4	nbtb	Loans And Leases Receivable Allowance For Credit Losses Individually Evaluated For Impairment LoansAndLeasesReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment	0
CY2022	nbtb	Financing Receivable Individually Evaluated For Impairment Number Of Relationships Resolved FinancingReceivableIndividuallyEvaluatedForImpairmentNumberOfRelationshipsResolved	1
CY2022	nbtb	Loans And Leases Receivable Allowance For Credit Losses Reversal Individually Evaluated For Impairment LoansAndLeasesReceivableAllowanceForCreditLossesReversalIndividuallyEvaluatedForImpairment	800000
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	17233000
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	8150147000
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	30285000
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	7498459000
CY2022Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	1100000
CY2021Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	8800000
CY2022	nbtb	Threshold Period Past Due For Loans To Be Considered Nonperforming ThresholdPeriodPastDueForLoansToBeConsideredNonperforming	P90D
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
CY2021Q4	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	2045326000
CY2021Q4	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	1179768000
CY2021Q4	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	993265000
CY2021Q4	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	680836000
CY2021Q4	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	528706000
CY2021Q4	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	1294841000
CY2021Q4	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	703846000
CY2021Q4	us-gaap	Financing Receivable Revolving Converted To Term Loan FinancingReceivableRevolvingConvertedToTermLoan	71871000
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	7498459000
CY2022	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	829000
CY2022	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	928000
CY2021	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	12
CY2021	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	1159000
CY2021	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	1274000
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
CY2020	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	64
CY2020	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	3774000
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	189809000
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	184361000
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	120762000
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	112268000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	69047000
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	72093000
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	23900000
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	25600000
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	23300000
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	27600000
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	6643000
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	7176000
CY2022	us-gaap	Variable Lease Cost VariableLeaseCost	2041000
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	2090000
CY2021	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0
CY2021Q4	us-gaap	Goodwill Goodwill	280541000
CY2022	us-gaap	Short Term Lease Cost ShortTermLeaseCost	297000
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	369000
CY2022	us-gaap	Sublease Income SubleaseIncome	266000
CY2021	us-gaap	Sublease Income SubleaseIncome	466000
CY2022	us-gaap	Lease Cost LeaseCost	8715000
CY2021	us-gaap	Lease Cost LeaseCost	9169000
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	6446000
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5427000
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4195000
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3298000
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	2681000
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	6327000
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	28374000
CY2022Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	2822000
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	25552000
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y5M1D
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y10M28D
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.031
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0297
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	8371000
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	7373000
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	7377000
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1843000
CY2022	nbtb	Operating Lease Expense Net OperatingLeaseExpenseNet	7200000
CY2021	nbtb	Operating Lease Expense Net OperatingLeaseExpenseNet	7200000
CY2020	nbtb	Operating Lease Expense Net OperatingLeaseExpenseNet	8000000
CY2021Q4	us-gaap	Goodwill Goodwill	280541000
CY2022	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	663000
CY2022Q4	us-gaap	Goodwill Goodwill	281204000
CY2020Q4	us-gaap	Goodwill Goodwill	280541000
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2022Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	31340000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	32460000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	23999000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	23533000
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7341000
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8927000
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2300000
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2800000
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3400000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1900000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1600000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1200000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1000000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	700000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	1000000
CY2022	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0
CY2020	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0
CY2021	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0
CY2022Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	280996000
CY2022Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	92492000
CY2022Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	24033000
CY2022Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	21483000
CY2021Q4	nbtb	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	6744000
CY2022Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	14332000
CY2022Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	436000
CY2022Q4	us-gaap	Time Deposits TimeDeposits	433772000
CY2022Q4	nbtb	Time Deposits250000 Or More TimeDeposits250000OrMore	48400000
CY2021Q4	nbtb	Time Deposits250000 Or More TimeDeposits250000OrMore	72300000
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	585000000
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	97800000
CY2022Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	2900000000
CY2021Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	3450000000
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	10598000
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0.0253
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
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Three To Four Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate	0
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Three To Four Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate	0
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
CY2021Q4	nbtb	Federal Home Loan Bank Advances Maturities Summary Due From Nine To Ten Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromNineToTenYearsOfBalanceSheetDate	3397000
CY2021Q4	nbtb	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate From Nine To Ten Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFromNineToTenYearsOfBalanceSheetDate	0.0245
CY2022Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	4815000
CY2021Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	13995000
CY2022Q4	nbtb	Number Of Statutory Business Trusts Included In Trusts NumberOfStatutoryBusinessTrustsIncludedInTrusts	5
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	9181000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	9584000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	22479000
CY2022Q4	nbtb	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	6273000
CY2022Q4	nbtb	Minimum Assets For Bank Holding Companies To Be Subject To Same Capital Requirements As Insured Depository Institutions MinimumAssetsForBankHoldingCompaniesToBeSubjectToSameCapitalRequirementsAsInsuredDepositoryInstitutions	500000000
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	51077000
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	35483000
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	36358000
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	12934000
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	8626000
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	9768000
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	64011000
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	44109000
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	46126000
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-15862000
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	507000
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-14021000
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
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-3406000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-19850000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	864000
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-17427000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44161000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44973000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28699000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	24792000
CY2020	nbtb	Effective Income Tax Rate Reconciliation Net Increase In Cash Surrender Value Of Life Insurance Amount EffectiveIncomeTaxRateReconciliationNetIncreaseInCashSurrenderValueOfLifeInsuranceAmount	1135000
CY2022	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	2417000
CY2022Q4	nbtb	Deferred Tax Assets Tax Deferred Expense Loan Fees DeferredTaxAssetsTaxDeferredExpenseLoanFees	33389000
CY2021Q4	nbtb	Deferred Tax Assets Tax Deferred Expense Loan Fees DeferredTaxAssetsTaxDeferredExpenseLoanFees	12936000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2822000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2679000
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Trading Securities DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	53663000
CY2021Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Trading Securities DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	1482000
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	6027000
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	7109000
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	136147000
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	63013000
CY2022Q4	nbtb	Deferred Tax Liabilities Pension And Executive Retirement DeferredTaxLiabilitiesPensionAndExecutiveRetirement	13103000
CY2021Q4	nbtb	Deferred Tax Liabilities Pension And Executive Retirement DeferredTaxLiabilitiesPensionAndExecutiveRetirement	16137000
CY2022Q4	nbtb	Deferred Tax Liabilities Lease Right Of Use Asset DeferredTaxLiabilitiesLeaseRightOfUseAsset	5877000
CY2021Q4	nbtb	Deferred Tax Liabilities Lease Right Of Use Asset DeferredTaxLiabilitiesLeaseRightOfUseAsset	5681000
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	14112000
CY2021Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	13187000
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	4889000
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	4962000
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	846000
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1008000
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	38827000
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	40975000
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	97320000
CY2021Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	22038000
CY2021Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	22038000
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	15117000
CY2022	nbtb	Deferred Tax Assets Liabilities Net Increase Decrease In Net Deferred Tax Asset DeferredTaxAssetsLiabilitiesNetIncreaseDecreaseInNetDeferredTaxAsset	75282000
CY2021	nbtb	Deferred Tax Assets Liabilities Net Increase Decrease In Net Deferred Tax Asset DeferredTaxAssetsLiabilitiesNetIncreaseDecreaseInNetDeferredTaxAsset	6921000
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
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	27948000
CY2022	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	984000
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	1014000
CY2020	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	981000
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
CY2021	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	1884000
CY2020	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	1705000
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	7067000
CY2021Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.03
CY2020Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.03
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	7097000
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5026000
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	517000
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	33000
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-454000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44161000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44973000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28699000
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1545000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1178000
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3000
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	80000
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	394000
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	287000
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1942000
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1545000
CY2022Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1535000
CY2021Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1221000
CY2022	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
CY2020Q4	nbtb	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Plan Assets DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnPlanAssets	0.07
CY2022Q4	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 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
CY2022Q4	us-gaap	Capital Capital	1391182000
CY2020Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate	0.0162
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
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.07
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
CY2020	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 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
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostWeightedAverageInterestCreditingRate	0.0228
CY2022Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.04
CY2022Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2021Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2021Q4	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
CY2022Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	1100000
CY2021Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	1300000
CY2021	us-gaap	Other Postretirement Benefit Expense OtherPostretirementBenefitExpense	200000
CY2020	us-gaap	Other Postretirement Benefit Expense OtherPostretirementBenefitExpense	200000
CY2022	us-gaap	Other Postretirement Benefit Expense OtherPostretirementBenefitExpense	200000
CY2022Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1538
CY2022Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.1212
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	384182
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
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	20134000
CY2022Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	0
CY2021Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	0
CY2020Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-16000
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
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	20567000
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
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	417000
CY2022	nbtb	Preceding Period Of Retained Net Profits For Approval Of Office Of Comptroller Of Currency PrecedingPeriodOfRetainedNetProfitsForApprovalOfOfficeOfComptrollerOfCurrency	P2Y
CY2022Q4	us-gaap	Statutory Accounting Practices Statutory Amount Available For Dividend Payments StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments	145300000
CY2022	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	400000
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	14700000
CY2022	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	36.78
CY2021Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	2000000
CY2022Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	1600000
CY2022	nbtb	Permissible Capital Transition Relief Period PermissibleCapitalTransitionReliefPeriod	P5Y
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	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 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
CY2021Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	1103661000
CY2021Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0941
CY2021Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.04
CY2021Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.05
CY2021Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	1006661000
CY2021Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.1225
CY2021Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.045
CY2021Q4	nbtb	Common Equity Tier One Risk Based Capital To Risk Weighted Assets Required For Capital Adequacy Plus Buffer CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssetsRequiredForCapitalAdequacyPlusBuffer	0.07
CY2021Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Well Capitalized Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum	0.065
CY2021Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	1103661000
CY2021Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1343
CY2021Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.06
CY2021Q4	nbtb	Tier One Risk Based Capital Required For Capital Adequacy Plus Buffer To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyPlusBufferToRiskWeightedAssets	0.085
CY2021Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.08
CY2021Q4	us-gaap	Capital Capital	1292669000
CY2021Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1573
CY2021Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.08
CY2021Q4	nbtb	Capital Required For Capital Adequacy Plus Buffer To Risk Weighted Assets CapitalRequiredForCapitalAdequacyPlusBufferToRiskWeightedAssets	0.105
CY2021Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10
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
CY2020	us-gaap	Net Income Loss NetIncomeLoss	104388000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43693000
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.39
CY2022	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	264000
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	298000
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	296000
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
CY2020	us-gaap	Net Income Loss NetIncomeLoss	104388000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43989000
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.37
CY2022Q4	nbtb	Percentage Of Companys Loans Secured By Real Estate PercentageOfCompanysLoansSecuredByRealEstate	0.59
CY2022	nbtb	Guarantor Obligations Period GuarantorObligationsPeriod	P1Y
CY2022	nbtb	Maintenance Period Basis Federal Reserve Bank MaintenancePeriodBasisFederalReserveBank	P14D
CY2022Q4	nbtb	Average Reserve Balances With Federal Reserve Bank AverageReserveBalancesWithFederalReserveBank	86700000

Files In Submission

Name	View Source	Status
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2023 Q1 Form 10-K Financial Statement

#000114036123009417 Filed on March 01, 2023

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$NBTB NBT BANCORP INC Stock $nbtb

2023 Q1 Form 10-K Financial Statement

#000114036123009417 Filed on March 01, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NBTB
NBT BANCORP INC Stock $nbtb