$NWBI
Northwest Bancshares, Inc. Stock $nwbi

$nwbi Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000147126524000009 Filed on February 23, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$160.2M		$587.9M
YoY Change	18.75%		31.0%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin	$4.916M		$22.40M
YoY Change	-16.71%		-0.06%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$4.646M	$8.024M	$11.50M
YoY Change	115.69%	211.73%	-0.86%
% of Gross Profit
Operating Expenses	$4.916M		$22.40M
YoY Change	-16.71%		-0.06%
Operating Profit
YoY Change
Interest Expense	$57.00M		$152.2M
YoY Change	153.61%		441.45%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$37.74M	$36.85M	$175.1M
YoY Change	-14.2%	-18.52%	0.8%
Income Tax	$8.579M	$7.835M	$40.12M
% Of Pretax Income	22.73%	21.26%	22.92%
Net Earnings	$29.16M	$28.94M	$135.0M
YoY Change	-13.41%	-16.12%	0.97%
Net Earnings / Revenue	18.2%		22.95%
Basic Earnings Per Share	$0.23		$1.06
Diluted Earnings Per Share	$0.23	$0.23	$1.06
COMMON SHARES
Basic Shares Outstanding	127.1M shares	127.1M shares	126.7M shares
Diluted Shares Outstanding	127.6M shares		127.0M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$119.3M	$122.3M
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	$130.6M	$138.8M	$200.6M
YoY Change	-6.94%	-4.85%	-0.13%
Goodwill	$381.0M	$381.0M
YoY Change	0.0%	0.0%
Intangibles	$4.589M	$5.290M
YoY Change	-40.02%	-38.2%
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	$14.51B	$14.42B	$14.42B
YoY Change	2.23%	2.17%	2.17%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$17.40M	$13.67M	$13.67M
YoY Change	677.95%	323.06%	323.06%
Accrued Expenses		$64.72M	$64.72M
YoY Change			12.1%
Deferred Revenue
YoY Change
Short-Term Debt	$400.8M	$398.9M
YoY Change	-41.8%	-41.44%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$17.40M	$78.39M	$78.39M
YoY Change	677.95%	2326.25%	28.58%
LONG-TERM LIABILITIES
Long-Term Debt	$243.9M	$642.7M	$642.7M
YoY Change	-73.83%	-30.47%	-30.47%
Other Long-Term Liabilities	$224.1M	$166.8M	$166.8M
YoY Change	7.12%	-27.38%	-3.0%
Total Long-Term Liabilities	$468.0M	$809.5M	$809.5M
YoY Change	-58.99%	-29.86%	-26.16%
TOTAL LIABILITIES
Total Short-Term Liabilities	$17.40M	$78.39M	$78.39M
Total Long-Term Liabilities	$468.0M	$809.5M	$809.5M
Total Liabilities	$12.96B	$12.87B	$12.87B
YoY Change	2.19%	1.95%	1.95%
SHAREHOLDERS EQUITY
Retained Earnings	$678.4M	$674.7M
YoY Change	4.43%	5.14%
Common Stock	$1.027B	$1.026B
YoY Change	0.52%	0.51%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.552B	$1.551B	$1.551B
YoY Change
Total Liabilities & Shareholders Equity	$14.51B	$14.42B	$14.42B
YoY Change	2.23%	2.17%	2.17%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$29.16M	$28.94M	$135.0M
YoY Change	-13.41%	-16.12%	0.97%
Depreciation, Depletion And Amortization	$4.646M	$8.024M	$11.50M
YoY Change	115.69%	211.73%	-0.86%
Cash From Operating Activities	$70.70M	$45.16M	$92.89M
YoY Change	136.91%	-30.89%	-47.05%
INVESTING ACTIVITIES
Capital Expenditures	$5.471M	$6.947M	$8.564M
YoY Change		87.4%	98.24%
Acquisitions
YoY Change
Other Investing Activities	-$138.1M	-$54.48M	-$231.1M
YoY Change	6.11%	-64.19%	-74.69%
Cash From Investing Activities	-$143.6M	-$61.42M	-$239.7M
YoY Change	10.32%	-60.59%	-73.87%
FINANCING ACTIVITIES
Cash Dividend Paid	$25.42M		$101.7M
YoY Change	0.07%		0.2%
Common Stock Issuance & Retirement, Net			$0.00
YoY Change
Debt Paid & Issued, Net			$0.00
YoY Change			-100.0%
Cash From Financing Activities	$69.95M	-23.47M	$129.7M
YoY Change	21.76%	-121.09%	-132.59%
NET CHANGE
Cash From Operating Activities	$70.70M	45.16M	$92.89M
Cash From Investing Activities	-$143.6M	-61.42M	-$239.7M
Cash From Financing Activities	$69.95M	-23.47M	$129.7M
Net Change In Cash	-$2.941M	-39.74M	-$17.11M
YoY Change	-93.14%	-290.89%	-98.5%
FREE CASH FLOW
Cash From Operating Activities	$70.70M	$45.16M	$92.89M
Capital Expenditures	$5.471M	$6.947M	$8.564M
Free Cash Flow	$65.23M	$38.21M	$84.33M
YoY Change		-38.01%	-50.72%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2023	nwbi	Financing Receivable Modifications Number Of Contracts2 Additions FinancingReceivableModificationsNumberOfContracts2Additions	14	contract
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001471265
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Amendment Flag AmendmentFlag	false
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CY2023Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAssets
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CY2023Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilities
CY2022Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilities
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CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	001-34582
CY2023	dei	Entity Registrant Name EntityRegistrantName	NORTHWEST BANCSHARES, INC.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-0950358
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	3 Easton Oval,
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CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Columbus,
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	OH
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CY2023	dei	City Area Code CityAreaCode	814
CY2023	dei	Local Phone Number LocalPhoneNumber	726-2140
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
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CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2022	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-8000	usd
CY2021	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-176000	usd
CY2023	nwbi	Gain On Sale Of Mortgage Servicing Rights GainOnSaleOfMortgageServicingRights	8305000	usd
CY2022	nwbi	Gain On Sale Of Mortgage Servicing Rights GainOnSaleOfMortgageServicingRights	0	usd
CY2021	nwbi	Gain On Sale Of Mortgage Servicing Rights GainOnSaleOfMortgageServicingRights	0	usd
CY2023	nwbi	Gain On Sale Of Sba Loans Net GainOnSaleOfSBALoansNet	1800000	usd
CY2022	nwbi	Gain On Sale Of Sba Loans Net GainOnSaleOfSBALoansNet	0	usd
CY2021	nwbi	Gain On Sale Of Sba Loans Net GainOnSaleOfSBALoansNet	0	usd
CY2023	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	726000	usd
CY2022	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	0	usd
CY2021	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	0	usd
CY2023	us-gaap	Fees And Commissions Mortgage Banking And Servicing FeesAndCommissionsMortgageBankingAndServicing	59214000	usd
CY2022	us-gaap	Fees And Commissions Mortgage Banking And Servicing FeesAndCommissionsMortgageBankingAndServicing	55188000	usd
CY2021	us-gaap	Fees And Commissions Mortgage Banking And Servicing FeesAndCommissionsMortgageBankingAndServicing	51837000	usd
CY2023	nwbi	Fees And Commissions Trust Services And Other Income FeesAndCommissionsTrustServicesAndOtherIncome	27284000	usd
CY2022	nwbi	Fees And Commissions Trust Services And Other Income FeesAndCommissionsTrustServicesAndOtherIncome	27765000	usd
CY2021	nwbi	Fees And Commissions Trust Services And Other Income FeesAndCommissionsTrustServicesAndOtherIncome	27921000	usd
CY2023	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	0	usd
CY2022	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	0	usd
CY2021	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	3633000	usd
CY2023	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	2006000	usd
CY2022	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	603000	usd
CY2021	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	442000	usd
CY2023	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	8588000	usd
CY2022	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	7129000	usd
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6050000	usd
CY2023	nwbi	Mortgage Banking Income MortgageBankingIncome	2431000	usd
CY2022	nwbi	Mortgage Banking Income MortgageBankingIncome	4865000	usd
CY2021	nwbi	Mortgage Banking Income MortgageBankingIncome	15892000	usd
CY2023	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	usd
CY2022	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	usd
CY2021	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	25327000	usd
CY2023	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	11776000	usd
CY2022	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	15307000	usd
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	11963000	usd
CY2023	us-gaap	Noninterest Income NoninterestIncome	113823000	usd
CY2022	us-gaap	Noninterest Income NoninterestIncome	110849000	usd
CY2021	us-gaap	Noninterest Income NoninterestIncome	142889000	usd
CY2023	us-gaap	Labor And Related Expense LaborAndRelatedExpense	195691000	usd
CY2022	us-gaap	Labor And Related Expense LaborAndRelatedExpense	188359000	usd
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	193887000	usd
CY2023	us-gaap	Occupancy Net OccupancyNet	29151000	usd
CY2022	us-gaap	Occupancy Net OccupancyNet	29618000	usd
CY2021	us-gaap	Occupancy Net OccupancyNet	31073000	usd
CY2023	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	12955000	usd
CY2022	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	13318000	usd
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	13769000	usd
CY2023	nwbi	Noninterest Expense Collection Of Receivables NoninterestExpenseCollectionOfReceivables	1695000	usd
CY2022	nwbi	Noninterest Expense Collection Of Receivables NoninterestExpenseCollectionOfReceivables	1808000	usd
CY2021	nwbi	Noninterest Expense Collection Of Receivables NoninterestExpenseCollectionOfReceivables	1932000	usd
CY2023	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	58687000	usd
CY2022	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	52496000	usd
CY2021	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	55763000	usd
CY2023	us-gaap	Marketing Expense MarketingExpense	9444000	usd
CY2022	us-gaap	Marketing Expense MarketingExpense	9095000	usd
CY2021	us-gaap	Marketing Expense MarketingExpense	8237000	usd
CY2023	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	9271000	usd
CY2022	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4778000	usd
CY2021	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4975000	usd
CY2023	us-gaap	Professional Fees ProfessionalFees	17819000	usd
CY2022	us-gaap	Professional Fees ProfessionalFees	14703000	usd
CY2021	us-gaap	Professional Fees ProfessionalFees	17621000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3270000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4277000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5553000	usd
CY2023	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	456000	usd
CY2022	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	223000	usd
CY2021	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	298000	usd
CY2023	nwbi	Merger Asset Disposition And Restructuring Expense MergerAssetDispositionAndRestructuringExpense	6749000	usd
CY2022	nwbi	Merger Asset Disposition And Restructuring Expense MergerAssetDispositionAndRestructuringExpense	5617000	usd
CY2021	nwbi	Merger Asset Disposition And Restructuring Expense MergerAssetDispositionAndRestructuringExpense	3453000	usd
CY2023	us-gaap	Other Noninterest Expense OtherNoninterestExpense	6366000	usd
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	5231000	usd
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	12254000	usd
CY2023	us-gaap	Noninterest Expense NoninterestExpense	351554000	usd
CY2022	us-gaap	Noninterest Expense NoninterestExpense	329523000	usd
CY2021	us-gaap	Noninterest Expense NoninterestExpense	348815000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	175078000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	173692000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	201124000	usd
CY2023	nwbi	Federal Tax Expense Benefit FederalTaxExpenseBenefit	31332000	usd
CY2022	nwbi	Federal Tax Expense Benefit FederalTaxExpenseBenefit	30910000	usd
CY2021	nwbi	Federal Tax Expense Benefit FederalTaxExpenseBenefit	35306000	usd
CY2023	nwbi	State And Local Tax Expense Benefit StateAndLocalTaxExpenseBenefit	8789000	usd
CY2022	nwbi	State And Local Tax Expense Benefit StateAndLocalTaxExpenseBenefit	9116000	usd
CY2021	nwbi	State And Local Tax Expense Benefit StateAndLocalTaxExpenseBenefit	11495000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40121000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40026000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	46801000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	134957000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	133666000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154323000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.06
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.05
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.22
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.06
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.05
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.21
CY2023	us-gaap	Net Income Loss NetIncomeLoss	134957000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	133666000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154323000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3429000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-45321000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-10333000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	7875000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-151888000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-28873000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-1700000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	92000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-5672000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	287000	usd
CY2023	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	13547000	usd
CY2022	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-151889000	usd
CY2021	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-29160000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-110000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-374000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	0	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	0	usd
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	3961000	usd
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	7182000	usd
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	9144000	usd
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	10019000	usd
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	18884000	usd
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	23748000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-607000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-202000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	515000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-1526000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-524000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	1332000	usd
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-8493000	usd
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-18360000	usd
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-25080000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	21666000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-133529000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-4080000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	156623000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	137000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	150243000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	1538703000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154323000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-766000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-4080000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	150243000	usd
CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	14011000	usd
CY2021	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	23854000	usd
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4742000	usd
CY2021	us-gaap	Stock Granted During Period Value Sharebased Compensation Forfeited StockGrantedDuringPeriodValueSharebasedCompensationForfeited	0	usd
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.79
CY2021	us-gaap	Dividends Cash DividendsCash	100274000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	1583571000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	133666000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-38341000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-133529000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	137000	usd
CY2022	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	5173000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4074000	usd
CY2022	us-gaap	Stock Granted During Period Value Sharebased Compensation Forfeited StockGrantedDuringPeriodValueSharebasedCompensationForfeited	1000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.80
CY2022	us-gaap	Dividends Cash DividendsCash	101468000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	1491486000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	134957000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	8373000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	21666000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	156623000	usd
CY2023	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	630000	usd
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4576000	usd
CY2023	us-gaap	Stock Granted During Period Value Sharebased Compensation Forfeited StockGrantedDuringPeriodValueSharebasedCompensationForfeited	0	usd
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.80
CY2023	us-gaap	Dividends Cash DividendsCash	101669000	usd
CY2022	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	383883000	usd
CY2021	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	804690000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	1551317000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	134957000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	133666000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154323000	usd
CY2023	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	22874000	usd
CY2022	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	28315000	usd
CY2021	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-15788000	usd
CY2023	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	8307000	usd
CY2022	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	0	usd
CY2021	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	0	usd
CY2023	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-2117000	usd
CY2022	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-42000	usd
CY2021	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	1201000	usd
CY2023	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	895000	usd
CY2022	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	3512000	usd
CY2021	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	20120000	usd
CY2023	nwbi	Gain On Sale Of Small Business Administration Loans GainOnSaleOfSmallBusinessAdministrationLoans	1754000	usd
CY2022	nwbi	Gain On Sale Of Small Business Administration Loans GainOnSaleOfSmallBusinessAdministrationLoans	0	usd
CY2021	nwbi	Gain On Sale Of Small Business Administration Loans GainOnSaleOfSmallBusinessAdministrationLoans	0	usd
CY2023	nwbi	Gain On Sale Of Mortgage Servicing Rights GainOnSaleOfMortgageServicingRights	8305000	usd
CY2022	nwbi	Gain On Sale Of Mortgage Servicing Rights GainOnSaleOfMortgageServicingRights	0	usd
CY2021	nwbi	Gain On Sale Of Mortgage Servicing Rights GainOnSaleOfMortgageServicingRights	0	usd
CY2023	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	726000	usd
CY2022	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	0	usd
CY2021	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	0	usd
CY2023	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	usd
CY2022	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	usd
CY2021	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	25327000	usd
CY2023	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	24497000	usd
CY2022	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	6448000	usd
CY2021	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	6633000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	117813000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	33751000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-22163000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	21771000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	19775000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	7930000	usd
CY2023	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-3090000	usd
CY2022	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-4808000	usd
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-7757000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	4576000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	4074000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	4742000	usd
CY2023	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	100000	usd
CY2022	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	54000	usd
CY2021	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	173000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-4920000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5504000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12314000	usd
CY2023	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	198637000	usd
CY2022	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	362867000	usd
CY2021	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	752831000	usd
CY2023	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	203651000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	92890000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	175431000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	205458000	usd
CY2023	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	usd
CY2022	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	212892000	usd
CY2021	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	658817000	usd
CY2023	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	23502000	usd
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	102178000	usd
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	705146000	usd
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	65588000	usd
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	98701000	usd
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	68495000	usd
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	103424000	usd
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	231728000	usd
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	449372000	usd
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	101229000	usd
CY2022	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	59579000	usd
CY2023	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	13307000	usd
CY2022	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	5096000	usd
CY2021	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	3984000	usd
CY2023	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	13118000	usd
CY2022	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	0	usd
CY2021	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	0	usd
CY2023	nwbi	Originations Of Loans Receivable Held For Investment OriginationsOfLoansReceivableHeldForInvestment	3963743000	usd
CY2022	nwbi	Originations Of Loans Receivable Held For Investment OriginationsOfLoansReceivableHeldForInvestment	4585563000	usd
CY2021	nwbi	Originations Of Loans Receivable Held For Investment OriginationsOfLoansReceivableHeldForInvestment	3961816000	usd
CY2023	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	0	usd
CY2022	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	371121000	usd
CY2021	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	0	usd
CY2023	nwbi	Proceeds From Maturities And Principal Reductions On Loans ProceedsFromMaturitiesAndPrincipalReductionsOnLoans	3446731000	usd
CY2022	nwbi	Proceeds From Maturities And Principal Reductions On Loans ProceedsFromMaturitiesAndPrincipalReductionsOnLoans	4047147000	usd
CY2021	nwbi	Proceeds From Maturities And Principal Reductions On Loans ProceedsFromMaturitiesAndPrincipalReductionsOnLoans	4490089000	usd
CY2023	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-9997000	usd
CY2022	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	25959000	usd
CY2021	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-7564000	usd
CY2023	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	2735000	usd
CY2022	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	1633000	usd
CY2021	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	2700000	usd
CY2023	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	0	usd
CY2022	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	305000	usd
CY2021	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	305000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8564000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4320000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	17517000	usd
CY2023	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	usd
CY2022	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	usd
CY2021	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	28238000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-239680000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-917423000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-232970000	usd
CY2023	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	515354000	usd
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-836617000	usd
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	701932000	usd
CY2023	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	usd
CY2022	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	10094000	usd
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	22105000	usd
CY2023	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-282270000	usd
CY2022	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	542073000	usd
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	1432000	usd
CY2023	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	-2360000	usd
CY2022	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	3031000	usd
CY2021	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	-648000	usd
CY2023	us-gaap	Payments Of Dividends PaymentsOfDividends	101669000	usd
CY2022	us-gaap	Payments Of Dividends PaymentsOfDividends	101468000	usd
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	100274000	usd
CY2023	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	630000	usd
CY2022	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	5173000	usd
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	14011000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	23854000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	129685000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-397902000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	570494000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-17105000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1139894000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	542982000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	139365000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1279259000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	736277000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-17105000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1139894000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	542982000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	122260000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	139365000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1279259000	usd
CY2023	nwbi	Cash Paid For Interest On Deposits CashPaidForInterestOnDeposits	86316000	usd
CY2022	nwbi	Cash Paid For Interest On Deposits CashPaidForInterestOnDeposits	13399000	usd
CY2021	nwbi	Cash Paid For Interest On Deposits CashPaidForInterestOnDeposits	18711000	usd
CY2023	nwbi	Cash Paid For Interest On Deposits And Borrowings CashPaidForInterestOnDepositsAndBorrowings	141801000	usd
CY2022	nwbi	Cash Paid For Interest On Deposits And Borrowings CashPaidForInterestOnDepositsAndBorrowings	26690000	usd
CY2021	nwbi	Cash Paid For Interest On Deposits And Borrowings CashPaidForInterestOnDepositsAndBorrowings	27496000	usd
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	47996000	usd
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	39365000	usd
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	33576000	usd
CY2023	nwbi	Transfer Of Other Real Estate And Other Repossessed Personal Property TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty	4055000	usd
CY2022	nwbi	Transfer Of Other Real Estate And Other Repossessed Personal Property TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty	4076000	usd
CY2021	nwbi	Transfer Of Other Real Estate And Other Repossessed Personal Property TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty	4897000	usd
CY2023	nwbi	Sale And Financing Of Other Real Estate Owned SaleAndFinancingOfOtherRealEstateOwned	70000	usd
CY2022	nwbi	Sale And Financing Of Other Real Estate Owned SaleAndFinancingOfOtherRealEstateOwned	175000	usd
CY2021	nwbi	Sale And Financing Of Other Real Estate Owned SaleAndFinancingOfOtherRealEstateOwned	54000	usd
CY2023Q4	nwbi	Number Of Banking Locations NumberOfBankingLocations	142	bank_location
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2023Q4	us-gaap	Trading Securities TradingSecurities	0	usd
CY2022Q4	us-gaap	Trading Securities TradingSecurities	0	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestBeforeAllowanceForCreditLoss	2500000	usd
CY2022Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestBeforeAllowanceForCreditLoss	2800000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	1600000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	2000000	usd
CY2023Q4	nwbi	Debt Securities Nonaccrual Status Threshold Period Past Due DebtSecuritiesNonaccrualStatusThresholdPeriodPastDue	P90D
CY2023Q4	nwbi	Debt Securities Nonaccrual DebtSecuritiesNonaccrual	0	usd
CY2022Q4	nwbi	Debt Securities Nonaccrual DebtSecuritiesNonaccrual	0	usd
CY2023	nwbi	Financing Receivable Accrued Interest Receivable FinancingReceivableAccruedInterestReceivable	42200000	usd
CY2022	nwbi	Financing Receivable Accrued Interest Receivable FinancingReceivableAccruedInterestReceivable	30400000	usd
CY2023	nwbi	Financing Receivable Number Of Days Delinquency For Accrued Interest On Loans To Be Considered Reversal FinancingReceivableNumberOfDaysDelinquencyForAccruedInterestOnLoansToBeConsideredReversal	P90D
CY2023	nwbi	Financing Receivable Number Of Days Delinquent For Loans To Be Placed On Nonaccrual Status FinancingReceivableNumberOfDaysDelinquentForLoansToBePlacedOnNonaccrualStatus	P90D
CY2023Q4	nwbi	Financing Receivable Performance Period FinancingReceivablePerformancePeriod	P6M
CY2023	nwbi	Period To Return Troubled Debt Restructured Loans Included In Non Performing Loans To Performing Status PeriodToReturnTroubledDebtRestructuredLoansIncludedInNonPerformingLoansToPerformingStatus	P180D
CY2023Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	8800000	usd
CY2022Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	9900000	usd
CY2023Q4	nwbi	Financing Receivable Purchased With Credit Deterioration Threshold Period Past Due FinancingReceivablePurchasedWithCreditDeteriorationThresholdPeriodPastDue	P30D
CY2023Q4	nwbi	Number Of Loan Segments NumberOfLoanSegments	7	segment
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2023	us-gaap	Use Of Estimates UseOfEstimates	Use of Estimates<div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of financial statements, in conformity with accounting principles generally accepted in the United States of America, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amount of revenues and expenses during the reporting period.</span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> The estimate and assumptions that we deem important to our financial statements relate to the allowance for credit losses. This estim</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">ate and assumptions are based on management’s best estimates and judgment and we evaluate them using historical experience and other factors, including the current economic environment. We adjust our estimates and assumptions when facts and circumstances dictate. As future events cannot be determined, actual results could differ significantly from our estimates.</span></div>
CY2023	us-gaap	Comparability Of Prior Year Financial Data ComparabilityOfPriorYearFinancialData	<span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Reclassification of Prior Years’ Statements</span><div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain items previously reported have been reclassified to conform with the current year’s reporting format. These reclassifications had no effect on the reported results of operations. An adjustment has been made to the Consolidated Statements of Income and Consolidated Statements of Cash Flows for the years ended December 31, 2022 and December 31, 2021, to reclassify the provision for credit losses - unfunded commitments, previously presented in other expense, to provide additional transparency to financial statement users.</span></div>
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	6529000	usd
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	6201000	usd
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	5802000	usd
CY2023	us-gaap	Variable Lease Cost VariableLeaseCost	863000	usd
CY2022	us-gaap	Variable Lease Cost VariableLeaseCost	677000	usd
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	662000	usd
CY2023	us-gaap	Lease Cost LeaseCost	7392000	usd
CY2022	us-gaap	Lease Cost LeaseCost	6878000	usd
CY2021	us-gaap	Lease Cost LeaseCost	6464000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	61727000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	54925000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	64723000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	57737000	usd
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	5941000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	6207000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	13736000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5588000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P16Y7M6D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P15Y7M6D
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.042
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.032
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	6153000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5912000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	5856000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	5786000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	5786000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	63147000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	92640000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	27917000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	64723000	usd
CY2023	us-gaap	Lease Cost LeaseCost	7400000	usd
CY2022	us-gaap	Lease Cost LeaseCost	6900000	usd
CY2021	us-gaap	Lease Cost LeaseCost	6500000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	1240003000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	223000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	196867000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	1043359000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	814839000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	1000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	115334000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	699506000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	1431728000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	105000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	213725000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	1218108000	usd
CY2022Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	881249000	usd
CY2022Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	0	usd
CY2022Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	129865000	usd
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	751384000	usd
CY2023Q4	us-gaap	Security Owned And Pledged As Collateral Associated Liabilities Fair Value SecurityOwnedAndPledgedAsCollateralAssociatedLiabilitiesFairValue	368500000	usd
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	101200000	usd
CY2023	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	9000	usd
CY2023	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	8300000	usd
CY2022	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	59600000	usd
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	410000	usd
CY2021	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	396000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2023Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	20729000	usd
CY2023Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1	323000	usd
CY2023Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	1704010000	usd
CY2023Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	311878000	usd
CY2023Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1724739000	usd
CY2023Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1	312201000	usd
CY2022Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	448576000	usd
CY2022Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1	27487000	usd
CY2022Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	1509214000	usd
CY2022Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	316103000	usd
CY2023Q4	nwbi	Financing Receivable Nonaccrual Including Nonaccrual With No Allowance FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance	94384000	usd
CY2023Q4	nwbi	Financing Receivable Recorded Investment90 Days Or More Past Maturity And Still Accruing FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing	2698000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	10920452000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	118036000	usd
CY2022Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1957790000	usd
CY2022Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1	343590000	usd
CY2023	nwbi	Number Of Investment Positions With Unrealized Losses NumberOfInvestmentPositionsWithUnrealizedLosses	488	position
CY2023Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	814839000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	11414809000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	10920452000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	125243000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	118036000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	11289566000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	10802416000	usd
CY2023Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	68300000	usd
CY2022Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	76100000	usd
CY2023	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	0	usd
CY2023Q4	us-gaap	Derecognized Assets Securitized Or Assetbacked Financing Arrangement Assets And Any Other Financial Assets Managed Together Principal Amount Outstanding DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding	230800000	usd
CY2022Q4	us-gaap	Derecognized Assets Securitized Or Assetbacked Financing Arrangement Assets And Any Other Financial Assets Managed Together Principal Amount Outstanding DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding	1549000000	usd
CY2023Q4	nwbi	Percentage Of Financing Receivable Portfolio Secured By Properties PercentageOfFinancingReceivablePortfolioSecuredByProperties	0.38
CY2022Q4	nwbi	Percentage Of Financing Receivable Portfolio Secured By Properties PercentageOfFinancingReceivablePortfolioSecuredByProperties	0.41
CY2023Q4	us-gaap	Loans Receivable With Variable Rates Of Interest1 LoansReceivableWithVariableRatesOfInterest1	4032000000.000	usd
CY2022Q4	us-gaap	Loans Receivable With Variable Rates Of Interest1 LoansReceivableWithVariableRatesOfInterest1	3333000000	usd
CY2023Q4	us-gaap	Loans Receivable With Fixed Rates Of Interest1 LoansReceivableWithFixedRatesOfInterest1	7314000000	usd
CY2022Q4	us-gaap	Loans Receivable With Fixed Rates Of Interest1 LoansReceivableWithFixedRatesOfInterest1	7511000000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	125243000	usd
CY2023	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	18664000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	21024000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	9141000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	118036000	usd
CY2020	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	8000000	usd
CY2023	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	726000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	118036000	usd
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	17860000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	20931000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	18866000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	102241000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	102241000	usd
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-11883000	usd
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	34137000	usd
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	13834000	usd
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	134427000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	11414809000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	125243000	usd
CY2022Q4	nwbi	Financing Receivable Nonaccrual Including Nonaccrual With No Allowance FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance	81236000	usd
CY2022Q4	nwbi	Financing Receivable Recorded Investment90 Days Or More Past Maturity And Still Accruing FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing	744000	usd
CY2022Q4	nwbi	Financing Receivable Troubled Debt Restructuring Excluding Nonaccrual FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual	40681000	usd
CY2022Q4	nwbi	Financing Receivable Allowance For Credit Loss Modifications FinancingReceivableAllowanceForCreditLossModifications	2400000	usd
CY2022Q4	nwbi	Financing Receivable Modifications Recorded Investment Additional Commitment FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment	404000	usd
CY2022Q4	nwbi	Financing Receivable Modifications Recorded Investment Non Accrual FinancingReceivableModificationsRecordedInvestmentNonAccrual	29200000	usd
CY2022Q4	nwbi	Financing Receivable Nonaccrual Including Nonaccrual With No Allowance FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance	81236000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	68835000	usd
CY2023Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	25549000	usd
CY2023Q4	nwbi	Financing Receivable Nonaccrual Including Nonaccrual With No Allowance FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance	94384000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	2698000	usd
CY2021Q4	nwbi	Financing Receivable Nonaccrual Including Nonaccrual With No Allowance FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance	158471000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	38722000	usd
CY2022Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	42514000	usd
CY2022Q4	nwbi	Financing Receivable Nonaccrual Including Nonaccrual With No Allowance FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance	81236000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	744000	usd
CY2022	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	678000	usd
CY2023Q4	nwbi	Financing Receivable Amortized Cost Of Collateral Dependent Loans FinancingReceivableAmortizedCostOfCollateralDependentLoans	67084000	usd
CY2022Q4	nwbi	Financing Receivable Amortized Cost Of Collateral Dependent Loans FinancingReceivableAmortizedCostOfCollateralDependentLoans	58110000	usd
CY2023	us-gaap	Financing Receivable Modification To Total Financing Receivables Excluding Accrued Interest Percent FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent	0.0001
CY2023Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	31000	usd
CY2023	us-gaap	Financing Receivable Modified Weighted Average Interest Rate Decrease From Modification FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification	0.17
CY2023	us-gaap	Financing Receivable Modified Weighted Average Term Increase From Modification FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification	P113M
CY2023Q4	nwbi	Financing Receivable Modified Payment Deferral Period FinancingReceivableModifiedPaymentDeferralPeriod	P0Y6M
CY2023Q4	nwbi	Financing Receivable Modified Threshold Period Past Due FinancingReceivableModifiedThresholdPeriodPastDue	P90D
CY2023	nwbi	Financing Receivable Modifications Recorded Investment Additions FinancingReceivableModificationsRecordedInvestmentAdditions	30894000	usd
CY2023	nwbi	Financing Receivable Modifications Number Of Contracts Remodified FinancingReceivableModificationsNumberOfContractsRemodified	11	contract
CY2023	nwbi	Financing Receivable Modifications Recorded Investment Re Modifications FinancingReceivableModificationsRecordedInvestmentReModifications	8391000	usd
CY2023	nwbi	Financing Receivable Modifications Number Of Contracts Net Paydowns FinancingReceivableModificationsNumberOfContractsNetPaydowns	0	usd
CY2023	nwbi	Financing Receivable Modifications Recorded Investment Net Paydowns FinancingReceivableModificationsRecordedInvestmentNetPaydowns	11870000	usd
CY2023Q4	nwbi	Financing Receivable Modifications Outstanding Number Of Contracts FinancingReceivableModificationsOutstandingNumberOfContracts	123	contract
CY2023Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	40681000	usd
CY2023Q4	nwbi	Financing Receivable Modifications Recorded Investment Accrual FinancingReceivableModificationsRecordedInvestmentAccrual	11442000	usd
CY2023Q4	nwbi	Financing Receivable Modifications Recorded Investment Non Accrual FinancingReceivableModificationsRecordedInvestmentNonAccrual	29239000	usd
CY2023	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	25	contract
CY2023	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	39285000	usd
CY2023	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	21910000	usd
CY2023	nwbi	Financing Receivable Modification Allowance For Credit Losses FinancingReceivableModificationAllowanceForCreditLosses	165000	usd
CY2022	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	18	contract
CY2022	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	16433000	usd
CY2022	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	14623000	usd
CY2022	nwbi	Financing Receivable Modification Allowance For Credit Losses FinancingReceivableModificationAllowanceForCreditLosses	1953000	usd
CY2023	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	25	contract
CY2023	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	21910000	usd
CY2022	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	18	contract
CY2022	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	14623000	usd
CY2023	nwbi	Financing Receivable Modifications Number Of Contracts Remodified FinancingReceivableModificationsNumberOfContractsRemodified	11	contract
CY2023	nwbi	Financing Receivable Remodifications Post Modification Recorded Investment FinancingReceivableRemodificationsPostModificationRecordedInvestment	588000	usd
CY2022	nwbi	Financing Receivable Modifications Number Of Contracts Remodified FinancingReceivableModificationsNumberOfContractsRemodified	9	contract
CY2022	nwbi	Financing Receivable Remodifications Post Modification Recorded Investment FinancingReceivableRemodificationsPostModificationRecordedInvestment	7370000	usd
CY2023	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	contract
CY2021	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	contract
CY2022	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	1	contract
CY2022	nwbi	Financing Receivable Modification That Subsequently Defaulted Pre Modification Recorded Investment FinancingReceivableModificationThatSubsequentlyDefaultedPreModificationRecordedInvestment	4167000	usd
CY2022	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	3823000	usd
CY2022	nwbi	Increase Decrease In Financing Receivable Modifications Recorded Investment Reserve IncreaseDecreaseInFinancingReceivableModificationsRecordedInvestmentReserve	0	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss Fee And Loan In Process FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess	11414809000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	2698000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss Fee And Loan In Process FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess	10920452000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	744000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	1684565000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	2448570000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	1785396000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	1190115000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear	762754000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	2364506000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	1099359000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Converted To Term Loan FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan	79544000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	11414809000	usd
CY2023	nwbi	Financing Receivable Excluding Accrued Interest Revolving Converted To Term Loan During The Period FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanDuringThePeriod	18900000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	2630339000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	2099871000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	1415571000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	914933000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear	575318000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	2274805000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	939858000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Converted To Term Loan FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan	69757000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	10920452000	usd
CY2022	nwbi	Financing Receivable Excluding Accrued Interest Revolving Converted To Term Loan During The Period FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanDuringThePeriod	20700000	usd
CY2023Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	1430775000	usd
CY2022Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	1388311000	usd
CY2021Q4	nwbi	Servicing Asset At Amortized Value Gross ServicingAssetAtAmortizedValueGross	10166000	usd
CY2021Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	11000	usd
CY2021Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	10155000	usd
CY2022	nwbi	Servicing Asset At Amortized Cost Additions Gross ServicingAssetAtAmortizedCostAdditionsGross	1282000	usd
CY2022	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	-4000	usd
CY2022	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	1286000	usd
CY2022	nwbi	Servicing Assets At Amortized Cost Amortization Gross ServicingAssetsAtAmortizedCostAmortizationGross	3646000	usd
CY2022	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	3646000	usd
CY2022Q4	nwbi	Servicing Asset At Amortized Value Gross ServicingAssetAtAmortizedValueGross	7802000	usd
CY2022Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	7000	usd
CY2022Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	7795000	usd
CY2023	nwbi	Servicing Asset At Amortized Cost Additions Gross ServicingAssetAtAmortizedCostAdditionsGross	788000	usd
CY2023	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	1000	usd
CY2023	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	787000	usd
CY2023	nwbi	Servicing Asset At Amortized Cost Additions Msr Sale ServicingAssetAtAmortizedCostAdditionsMSRSale	5930000	usd
CY2023	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Sales ValuationAllowanceForImpairmentOfRecognizedServicingAssetsSales	0	usd
CY2023	us-gaap	Servicing Asset At Amortized Value Disposals ServicingAssetAtAmortizedValueDisposals	5930000	usd
CY2023	nwbi	Servicing Assets At Amortized Cost Amortization Gross ServicingAssetsAtAmortizedCostAmortizationGross	1551000	usd
CY2023	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	1551000	usd
CY2023Q4	nwbi	Servicing Asset At Amortized Value Gross ServicingAssetAtAmortizedValueGross	1109000	usd
CY2023Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	8000	usd
CY2023Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	1101000	usd
CY2023Q4	nwbi	Accrued Interest Receivable On Investments AccruedInterestReceivableOnInvestments	1795000	usd
CY2022Q4	nwbi	Accrued Interest Receivable On Investments AccruedInterestReceivableOnInvestments	1722000	usd
CY2023Q4	nwbi	Accrued Interest Receivable On Fhld Dividends AccruedInterestReceivableOnFHLDDividends	637000	usd
CY2022Q4	nwbi	Accrued Interest Receivable On Fhld Dividends AccruedInterestReceivableOnFHLDDividends	391000	usd
CY2023Q4	nwbi	Accrued Interest Receivable On Mortgage Backed Securities AccruedInterestReceivableOnMortgageBackedSecurities	2743000	usd
CY2022Q4	nwbi	Accrued Interest Receivable On Mortgage Backed Securities AccruedInterestReceivableOnMortgageBackedSecurities	3020000	usd
CY2023Q4	nwbi	Accrued Interest Receivable On Loans AccruedInterestReceivableOnLoans	42178000	usd
CY2022Q4	nwbi	Accrued Interest Receivable On Loans AccruedInterestReceivableOnLoans	30395000	usd
CY2023Q4	us-gaap	Time Deposits TimeDeposits	2602881000	usd
CY2022Q4	us-gaap	Time Deposits TimeDeposits	1052285000	usd
CY2023Q4	us-gaap	Deposits Deposits	11979902000	usd
CY2022Q4	us-gaap	Deposits Deposits	11464548000	usd
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	483900000	usd
CY2022Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	0	usd
CY2023Q4	us-gaap	Interest Receivable InterestReceivable	47353000	usd
CY2022Q4	us-gaap	Interest Receivable InterestReceivable	35528000	usd
CY2023	nwbi	Federal Home Loan Bank Stock Dividend Received FederalHomeLoanBankStockDividendReceived	2900000	usd
CY2022	nwbi	Federal Home Loan Bank Stock Dividend Received FederalHomeLoanBankStockDividendReceived	730000	usd
CY2023Q4	nwbi	Number Of Subclasses Of Federal Home Loan Bank Of Pittsburgh Capital Stock Required To Invest In For Membership NumberOfSubclassesOfFederalHomeLoanBankOfPittsburghCapitalStockRequiredToInvestInForMembership	2	subclass
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	321408000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	325697000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	182570000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	179788000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	138838000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	145909000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	11500000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	11600000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	12100000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	5290000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	8560000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5553000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4277000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3270000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	2452000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1662000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	871000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	305000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	380997000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	380997000	usd
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023Q4	us-gaap	Noninterest Bearing Domestic Deposit Checking NoninterestBearingDomesticDepositChecking	2669023000	usd
CY2022Q4	us-gaap	Noninterest Bearing Domestic Deposit Checking NoninterestBearingDomesticDepositChecking	2993243000	usd
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	2634546000	usd
CY2022Q4	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	2686431000	usd
CY2023Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	1968218000	usd
CY2022Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	2457569000	usd
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	2105234000	usd
CY2022Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	2275020000	usd
CY2023Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	950300000	usd
CY2022Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	355000000	usd
CY2023Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	1835000000	usd
CY2022Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	4031000000.000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	2464022000	usd
CY2022Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	754564000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	70679000	usd
CY2022Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	186803000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	27550000	usd
CY2022Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	46500000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	23590000	usd
CY2022Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	26734000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	13997000	usd
CY2022Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	33691000	usd
CY2023Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	3043000	usd
CY2022Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	3993000	usd
CY2023Q4	us-gaap	Time Deposits TimeDeposits	2602881000	usd
CY2022Q4	us-gaap	Time Deposits TimeDeposits	1052285000	usd
CY2023	us-gaap	Interest Expense Domestic Deposit Liabilities Checking InterestExpenseDomesticDepositLiabilitiesChecking	11606000	usd
CY2022	us-gaap	Interest Expense Domestic Deposit Liabilities Checking InterestExpenseDomesticDepositLiabilitiesChecking	1517000	usd
CY2021	us-gaap	Interest Expense Domestic Deposit Liabilities Checking InterestExpenseDomesticDepositLiabilitiesChecking	1660000	usd
CY2023	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	24734000	usd
CY2022	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	3381000	usd
CY2021	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	2597000	usd
CY2023	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	8822000	usd
CY2022	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	2339000	usd
CY2021	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	2413000	usd
CY2023	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	60181000	usd
CY2022	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	6883000	usd
CY2021	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	12452000	usd
CY2023	us-gaap	Interest Expense Deposits InterestExpenseDeposits	105343000	usd
CY2022	us-gaap	Interest Expense Deposits InterestExpenseDeposits	14120000	usd
CY2021	us-gaap	Interest Expense Deposits InterestExpenseDeposits	19122000	usd
CY2023	us-gaap	Interest Expense Domestic Deposit Liabilities Brokered InterestExpenseDomesticDepositLiabilitiesBrokered	7800000	usd
CY2022	us-gaap	Interest Expense Domestic Deposit Liabilities Brokered InterestExpenseDomesticDepositLiabilitiesBrokered	0	usd
CY2021	us-gaap	Interest Expense Domestic Deposit Liabilities Brokered InterestExpenseDomesticDepositLiabilitiesBrokered	0	usd
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	398895000	usd
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	681166000	usd
CY2023Q4	us-gaap	Subordinated Debt SubordinatedDebt	114200000	usd
CY2022Q4	us-gaap	Subordinated Debt SubordinatedDebt	113800000	usd
CY2023Q4	nwbi	Number Of Statutory Business Trusts NumberOfStatutoryBusinessTrusts	7	business_trust
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40121000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40026000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	46801000	usd
CY2023	nwbi	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Available For Sale Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesAvailableForSaleArisingDuringPeriodTax	3429000	usd
CY2022	nwbi	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Available For Sale Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesAvailableForSaleArisingDuringPeriodTax	-45321000	usd
CY2021	nwbi	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Available For Sale Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesAvailableForSaleArisingDuringPeriodTax	-10425000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-3354000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-6980000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-9659000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-110000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	0	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	0	usd
CY2023	nwbi	Income Tax Expense Benefit Unallocated IncomeTaxExpenseBenefitUnallocated	46794000	usd
CY2022	nwbi	Income Tax Expense Benefit Unallocated IncomeTaxExpenseBenefitUnallocated	1685000	usd
CY2021	nwbi	Income Tax Expense Benefit Unallocated IncomeTaxExpenseBenefitUnallocated	46035000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	36599000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	36235000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	24554000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	8442000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	9295000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	9933000	usd
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	45041000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	45530000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	34487000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-5267000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-5325000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	10752000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	347000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-179000	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1562000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-4920000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5504000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12314000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40121000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40026000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	46801000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.012
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.011
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.009
CY2023	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.040
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.040
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.045
CY2023	nwbi	Effective Income Tax Rate Reconciliation Tax Exempt Income Related To Bank Owned Life Insurance Percent EffectiveIncomeTaxRateReconciliationTaxExemptIncomeRelatedToBankOwnedLifeInsurancePercent	0.010
CY2022	nwbi	Effective Income Tax Rate Reconciliation Tax Exempt Income Related To Bank Owned Life Insurance Percent EffectiveIncomeTaxRateReconciliationTaxExemptIncomeRelatedToBankOwnedLifeInsurancePercent	0.009
CY2021	nwbi	Effective Income Tax Rate Reconciliation Tax Exempt Income Related To Bank Owned Life Insurance Percent EffectiveIncomeTaxRateReconciliationTaxExemptIncomeRelatedToBankOwnedLifeInsurancePercent	0.006
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	0
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	0.001
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.001
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.004
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.005
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.004
CY2023	nwbi	Effective Income Tax Rate Reconciliation Low Income Housing And Historic Tax Credits EffectiveIncomeTaxRateReconciliationLowIncomeHousingAndHistoricTaxCredits	0
CY2022	nwbi	Effective Income Tax Rate Reconciliation Low Income Housing And Historic Tax Credits EffectiveIncomeTaxRateReconciliationLowIncomeHousingAndHistoricTaxCredits	0.002
CY2021	nwbi	Effective Income Tax Rate Reconciliation Low Income Housing And Historic Tax Credits EffectiveIncomeTaxRateReconciliationLowIncomeHousingAndHistoricTaxCredits	0.002
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.005
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.006
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.229
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.230
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.233
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	5001000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	4804000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	28483000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	27105000	usd
CY2023Q4	nwbi	Deferred Tax Assets Other Reserves DeferredTaxAssetsOtherReserves	4511000	usd
CY2022Q4	nwbi	Deferred Tax Assets Other Reserves DeferredTaxAssetsOtherReserves	3554000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	477000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	502000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1134000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	652000	usd
CY2023Q4	nwbi	Deferred Tax Assets Expense Compensation And Pension Benefits And Other Postretirement Benefits DeferredTaxAssetsExpenseCompensationAndPensionBenefitsAndOtherPostretirementBenefits	0	usd
CY2022Q4	nwbi	Deferred Tax Assets Expense Compensation And Pension Benefits And Other Postretirement Benefits DeferredTaxAssetsExpenseCompensationAndPensionBenefitsAndOtherPostretirementBenefits	2767000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	45985000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	49414000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	35000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	95000	usd
CY2023Q4	nwbi	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	14593000	usd
CY2022Q4	nwbi	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	13101000	usd
CY2023Q4	nwbi	Deferred Tax Assets Purchase Accounting DeferredTaxAssetsPurchaseAccounting	698000	usd
CY2022Q4	nwbi	Deferred Tax Assets Purchase Accounting DeferredTaxAssetsPurchaseAccounting	696000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1058000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1592000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2431000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1877000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	104406000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	106159000	usd
CY2023Q4	nwbi	Deferred Tax Liabilities Pension Costs DeferredTaxLiabilitiesPensionCosts	6543000	usd
CY2022Q4	nwbi	Deferred Tax Liabilities Pension Costs DeferredTaxLiabilitiesPensionCosts	6231000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	18041000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	17400000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	242000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	1768000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	5567000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	6518000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	2412000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	3055000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	13917000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	12463000	usd
CY2023Q4	nwbi	Deferred Tax Liabilities Unrealized Gains On Available For Sale Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities	587000	usd
CY2022Q4	nwbi	Deferred Tax Liabilities Unrealized Gains On Available For Sale Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities	0	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	134000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	123000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2388000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2369000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	49831000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	49927000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	54575000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	56232000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	473000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	241000	usd
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	331000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	623000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	252000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	37000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	74000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	28000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	173000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	58000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	8000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	46000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1080000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	473000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	241000	usd
CY2022Q4	us-gaap	Bad Debt Reserve For Tax Purposes Of Qualified Lender BadDebtReserveForTaxPurposesOfQualifiedLender	39100000	usd
CY2023Q4	us-gaap	Bad Debt Reserve For Tax Purposes Of Qualified Lender BadDebtReserveForTaxPurposesOfQualifiedLender	39100000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	134957000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	133666000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	154323000	usd
CY2023	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	339000	usd
CY2022	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	585000	usd
CY2021	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1010000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	134618000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	134618000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	133081000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	133081000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	153313000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	153313000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	126668671	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	126167892	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	126181586	shares
CY2023	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	319501	shares
CY2022	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	556201	shares
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	828251	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	126988172	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	126724093	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	127009837	shares
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.06
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.05
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.22
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.06
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.05
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.21
CY2023	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2023	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.04
CY2020Q3	nwbi	Defined Benefit Plan Soft Freeze Hours Threshold DefinedBenefitPlanSoftFreezeHoursThreshold	1000	hour
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4400000	usd
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3600000	usd
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4600000	usd
CY2023	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1100000	usd
CY2022	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	893000	usd
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	5500000	usd
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3657580	shares
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	14.25
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4380310	shares
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	14.05
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	5243172	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	13.72
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2023Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	216596000	usd
CY2023Q4	nwbi	Defined Benefit Plan Plan Assets Amount Including Accrued Interest And Dividends DefinedBenefitPlanPlanAssetsAmountIncludingAccruedInterestAndDividends	217000000	usd
CY2022Q4	nwbi	Defined Benefit Plan Plan Assets Amount Including Accrued Interest And Dividends DefinedBenefitPlanPlanAssetsAmountIncludingAccruedInterestAndDividends	203000000	usd
CY2022	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	693972	shares
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	13.68
CY2023	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	63315	shares
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	11.46
CY2022	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	465920	shares
CY2022	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	12.14
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1219581	shares
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	12.28
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	385260	shares
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	13.80
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	256810	shares
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	14.64
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	337253	shares
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	14.59
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3209005	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	14.36
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3657580	shares
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	14.25
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4380310	shares
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	14.05
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	2601367	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	14.52
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	2556235	shares
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	14.43
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	2618733	shares
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	14.15
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.64
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	115000	usd
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	839000	usd
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	2300000	usd
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	748000	usd
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	5300000	usd
CY2022	nwbi	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Financial Instruments Total Unrealized Gains Losses Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisFinancialInstrumentsTotalUnrealizedGainsLossesPeriodIncreaseDecrease	0	usd
CY2023	nwbi	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Financial Instruments Total Unrealized Gains Losses Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisFinancialInstrumentsTotalUnrealizedGainsLossesPeriodIncreaseDecrease	0	usd
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	559000	usd
CY2021Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	1684000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease	82000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease	-1125000	usd
CY2023Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	641000	usd
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	559000	usd
CY2023Q4	nwbi	Capital Required To Be Well Capitalized Capital Conservation Buffer CapitalRequiredToBeWellCapitalizedCapitalConservationBuffer	0.025
CY2023Q4	nwbi	Capital Required To Be Well Capitalized Capital Conservation Buffer CapitalRequiredToBeWellCapitalizedCapitalConservationBuffer	0.025
CY2022Q4	nwbi	Capital Required To Be Well Capitalized Capital Conservation Buffer CapitalRequiredToBeWellCapitalizedCapitalConservationBuffer	0.025
CY2023	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	17520000	usd
CY2023	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-4146000	usd
CY2023	us-gaap	Aoci Including Portion Attributable To Noncontrolling Interest Period Increase Decrease AociIncludingPortionAttributableToNoncontrollingInterestPeriodIncreaseDecrease	21666000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3429000	usd
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CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-1700000	usd
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CY2022	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-133004000	usd
CY2022	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	525000	usd
CY2022	us-gaap	Aoci Including Portion Attributable To Noncontrolling Interest Period Increase Decrease AociIncludingPortionAttributableToNoncontrollingInterestPeriodIncreaseDecrease	-133529000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-45321000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	0	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	0	usd
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	7182000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	usd
CY2022	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-202000	usd
CY2021	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-5125000	usd
CY2021	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-1045000	usd
CY2021	us-gaap	Aoci Including Portion Attributable To Noncontrolling Interest Period Increase Decrease AociIncludingPortionAttributableToNoncontrollingInterestPeriodIncreaseDecrease	-4080000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-10333000	usd
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	9144000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	92000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	515000	usd
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CY2023Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	42940000	usd
CY2022Q4	us-gaap	Derivative Asset Notional Amount DerivativeAssetNotionalAmount	675750000	usd
CY2022Q4	us-gaap	Derivative Assets DerivativeAssets	27329000	usd
CY2022Q4	us-gaap	Derivative Liability Notional Amount DerivativeLiabilityNotionalAmount	767601000	usd
CY2022Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	45505000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	1573000	usd
CY2023	dei	Auditor Name AuditorName	KPMG LLP
CY2023	dei	Auditor Location AuditorLocation	Pittsburgh, PA
CY2023	dei	Auditor Firm AuditorFirmId	185

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$NWBI
Northwest Bancshares, Inc. Stock $nwbi

2024 Q1 Form 10-K Financial Statement

#000147126524000009 Filed on February 23, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWBI Northwest Bancshares, Inc. Stock $nwbi

2024 Q1 Form 10-K Financial Statement

#000147126524000009 Filed on February 23, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWBI
Northwest Bancshares, Inc. Stock $nwbi