$NWBI
Northwest Bancshares, Inc. Stock $nwbi

$nwbi Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-Q Financial Statement

#000147126520000127 Filed on November 06, 2020

Income Statement

Concept	2020 Q4	2020 Q3	2019 Q3
Revenue	$111.7M	$113.4M	$106.9M
YoY Change	8.04%	6.13%	11.78%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin		$6.773M	$4.570M
YoY Change		48.21%	-16.25%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	-$1.900M	$2.600M	-$500.0K
YoY Change	-165.52%	-620.0%	-155.56%
% of Gross Profit
Operating Expenses		$6.773M	$4.570M
YoY Change		48.21%	-16.25%
Operating Profit
YoY Change
Interest Expense	$8.841M	$9.880M	$15.93M
YoY Change	-38.91%	-37.98%	62.75%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$44.39M	$46.52M	$43.21M
YoY Change	37.16%	7.66%	24.25%
Income Tax	$9.327M	$8.467M	$9.793M
% Of Pretax Income	21.01%	18.2%	22.67%
Net Earnings	$35.10M	$38.05M	$33.40M
YoY Change	37.11%	13.92%	20.58%
Net Earnings / Revenue	31.42%	33.55%	31.25%
Basic Earnings Per Share	$0.28	$0.30	$0.32
Diluted Earnings Per Share	$0.28	$0.30	$0.31
COMMON SHARES
Basic Shares Outstanding	127.8M shares	126.9M shares	105.5M shares
Diluted Shares Outstanding		126.9M shares	106.3M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$736.3M	$656.7M	$107.6M
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	$161.5M	$166.9M	$148.8M
YoY Change	9.58%	12.18%	2.89%
Goodwill	$382.3M	$386.0M	$344.7M
YoY Change	10.45%	11.99%	12.13%
Intangibles	$19.94M	$21.60M	$22.41M
YoY Change	-13.61%	-3.61%	5.87%
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$13.81B	$13.79B	$10.58B
YoY Change	31.56%	30.32%	10.5%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.000M	$1.000M	$1.000M
YoY Change	100.0%	0.0%	0.0%
Accrued Expenses			$52.00M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$159.7M	$398.2M
YoY Change	-35.16%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$2.000M	$1.000M	$53.00M
YoY Change	-96.23%	-98.11%	5200.0%
LONG-TERM LIABILITIES
Long-Term Debt	$412.0M	$527.0M	$377.0M
YoY Change	11.96%	39.79%	30.0%
Other Long-Term Liabilities	$254.0M	$257.0M	$117.0M
YoY Change	100.0%	119.66%	30.0%
Total Long-Term Liabilities	$666.0M	$784.0M	$494.0M
YoY Change	34.55%	58.7%	30.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.000M	$1.000M	$53.00M
Total Long-Term Liabilities	$666.0M	$784.0M	$494.0M
Total Liabilities	$12.27B	$12.24B	$9.229B
YoY Change	34.21%	32.65%	10.73%
SHAREHOLDERS EQUITY
Retained Earnings	$555.5M	$544.7M	$577.0M
YoY Change	-4.79%	-5.6%	6.57%
Common Stock	$1.017B	$1.025B	$802.4M
YoY Change	26.02%	27.75%	7.87%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.539B	$1.547B	$1.352B
YoY Change
Total Liabilities & Shareholders Equity	$13.81B	$13.79B	$10.58B
YoY Change	31.56%	30.32%	10.5%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2019 Q3
OPERATING ACTIVITIES
Net Income	$35.10M	$38.05M	$33.40M
YoY Change	37.11%	13.92%	20.58%
Depreciation, Depletion And Amortization	-$1.900M	$2.600M	-$500.0K
YoY Change	-165.52%	-620.0%	-155.56%
Cash From Operating Activities	-$13.40M	$66.40M	$29.70M
YoY Change	-179.76%	123.57%	-25.19%
INVESTING ACTIVITIES
Capital Expenditures	-$1.500M	-$3.000M	-$2.800M
YoY Change	-6.25%	7.14%	64.71%
Acquisitions
YoY Change
Other Investing Activities	$83.20M	-$143.9M	-$58.90M
YoY Change	156.0%	144.31%	-25.25%
Cash From Investing Activities	$81.70M	-$146.9M	-$61.70M
YoY Change	164.4%	138.09%	-23.45%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	11.20M	-100.0M	32.50M
YoY Change	-111.86%	-407.69%	-279.56%
NET CHANGE
Cash From Operating Activities	-13.40M	66.40M	29.70M
Cash From Investing Activities	81.70M	-146.9M	-61.70M
Cash From Financing Activities	11.20M	-100.0M	32.50M
Net Change In Cash	79.50M	-180.5M	500.0K
YoY Change	-270.24%	-36200.0%	-100.85%
FREE CASH FLOW
Cash From Operating Activities	-$13.40M	$66.40M	$29.70M
Capital Expenditures	-$1.500M	-$3.000M	-$2.800M
Free Cash Flow	-$11.90M	$69.40M	$32.50M
YoY Change	-164.67%	113.54%	-21.5%

Facts In Submission

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	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
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	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
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	dei	Entity File Number EntityFileNumber	001-34582
	dei	Entity Registrant Name EntityRegistrantName	NORTHWEST BANCSHARES, INC.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-0950358
	dei	Entity Address Address Line1 EntityAddressAddressLine1	100 Liberty Street
	dei	Entity Address City Or Town EntityAddressCityOrTown	Warren,
	dei	Entity Address State Or Province EntityAddressStateOrProvince	PA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	16365
	dei	City Area Code CityAreaCode	814
	dei	Local Phone Number LocalPhoneNumber	726-2140
	dei	Entity Shell Company EntityShellCompany	false
	dei	Security12b Title Security12bTitle	Common Stock, 0.01 Par Value
	dei	Trading Symbol TradingSymbol	NWBI
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
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CY2020Q3	nwbi	Fees And Commissions Trust Services And Other Income FeesAndCommissionsTrustServicesAndOtherIncome	5376000	USD
CY2019Q3	nwbi	Fees And Commissions Trust Services And Other Income FeesAndCommissionsTrustServicesAndOtherIncome	4609000	USD
	nwbi	Fees And Commissions Trust Services And Other Income FeesAndCommissionsTrustServicesAndOtherIncome	15200000	USD
	nwbi	Fees And Commissions Trust Services And Other Income FeesAndCommissionsTrustServicesAndOtherIncome	13248000	USD
CY2020Q3	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	2331000	USD
CY2019Q3	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	1887000	USD
	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	7098000	USD
	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	6210000	USD
CY2020Q3	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-32000	USD
CY2019Q3	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-227000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-220000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-139000	USD
CY2020Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1576000	USD
CY2019Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1095000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3860000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3297000	USD
CY2020Q3	nwbi	Mortgage Banking Income MortgageBankingIncome	11055000	USD
CY2019Q3	nwbi	Mortgage Banking Income MortgageBankingIncome	1921000	USD
	nwbi	Mortgage Banking Income MortgageBankingIncome	24271000	USD
	nwbi	Mortgage Banking Income MortgageBankingIncome	2325000	USD
CY2020Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2022000	USD
CY2019Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2500000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5931000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	6464000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	36670000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	26169000	USD
	us-gaap	Noninterest Income NoninterestIncome	100142000	USD
	us-gaap	Noninterest Income NoninterestIncome	71194000	USD
CY2020Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	47371000	USD
CY2019Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	40816000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	130166000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	121012000	USD
CY2020Q3	us-gaap	Occupancy Net OccupancyNet	8342000	USD
CY2019Q3	us-gaap	Occupancy Net OccupancyNet	7061000	USD
	us-gaap	Occupancy Net OccupancyNet	23008000	USD
	us-gaap	Occupancy Net OccupancyNet	21666000	USD
CY2020Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	4626000	USD
CY2019Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	3197000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	11719000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	10036000	USD
CY2020Q3	nwbi	Noninterest Expense Collection Of Receivables NoninterestExpenseCollectionOfReceivables	1264000	USD
CY2019Q3	nwbi	Noninterest Expense Collection Of Receivables NoninterestExpenseCollectionOfReceivables	747000	USD
	nwbi	Noninterest Expense Collection Of Receivables NoninterestExpenseCollectionOfReceivables	2382000	USD
	nwbi	Noninterest Expense Collection Of Receivables NoninterestExpenseCollectionOfReceivables	1994000	USD
CY2020Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	15042000	USD
CY2019Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	11122000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	37864000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	32190000	USD
CY2020Q3	us-gaap	Marketing Expense MarketingExpense	2147000	USD
CY2019Q3	us-gaap	Marketing Expense MarketingExpense	1373000	USD
	us-gaap	Marketing Expense MarketingExpense	5701000	USD
	us-gaap	Marketing Expense MarketingExpense	5988000	USD
CY2020Q3	nwbi	Federal Deposit Insurance Corporation Premium Expense Net FederalDepositInsuranceCorporationPremiumExpenseNet	1498000	USD
CY2019Q3	nwbi	Federal Deposit Insurance Corporation Premium Expense Net FederalDepositInsuranceCorporationPremiumExpenseNet	-702000	USD
	nwbi	Federal Deposit Insurance Corporation Premium Expense Net FederalDepositInsuranceCorporationPremiumExpenseNet	3116000	USD
	nwbi	Federal Deposit Insurance Corporation Premium Expense Net FederalDepositInsuranceCorporationPremiumExpenseNet	685000	USD
CY2020Q3	us-gaap	Professional Fees ProfessionalFees	3246000	USD
CY2019Q3	us-gaap	Professional Fees ProfessionalFees	3032000	USD
	us-gaap	Professional Fees ProfessionalFees	8883000	USD
	us-gaap	Professional Fees ProfessionalFees	8754000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1781000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1702000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5192000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4909000	USD
CY2020Q3	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	111000	USD
CY2019Q3	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	119000	USD
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	295000	USD
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	406000	USD
CY2020Q3	nwbi	Business Combination Acquisition And Integration Costs BusinessCombinationAcquisitionAndIntegrationCosts	1414000	USD
CY2019Q3	nwbi	Business Combination Acquisition And Integration Costs BusinessCombinationAcquisitionAndIntegrationCosts	23000	USD
	nwbi	Business Combination Acquisition And Integration Costs BusinessCombinationAcquisitionAndIntegrationCosts	13551000	USD
	nwbi	Business Combination Acquisition And Integration Costs BusinessCombinationAcquisitionAndIntegrationCosts	3054000	USD
CY2020Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	27000	USD
CY2019Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	2106000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	12766000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	8838000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	86869000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	70596000	USD
	us-gaap	Noninterest Expense NoninterestExpense	254643000	USD
	us-gaap	Noninterest Expense NoninterestExpense	219532000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	46517000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	43207000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	48134000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	108747000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8467000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9793000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8345000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23906000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	38050000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33414000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	39789000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	84841000	USD
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.30
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.30
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.32
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	38050000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33414000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	39789000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	84841000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	107000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	525000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	5286000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	4549000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	676000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1315000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	13623000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	11376000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-1000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	3000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	675000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1314000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	13624000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	11373000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-209000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-946000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-375000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-375000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-946000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-946000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	99000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	83000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	297000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	250000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-250000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-208000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-748000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-626000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1871000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1522000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	14372000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	11999000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	39921000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	34936000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	54161000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	96840000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	1530849000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	38050000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	581000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1871000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	39921000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	743000	USD
CY2020Q3	us-gaap	Stock Granted During Period Value Sharebased Compensation Forfeited StockGrantedDuringPeriodValueSharebasedCompensationForfeited	-1000	USD
CY2020Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.19
CY2020Q3	us-gaap	Dividends Cash DividendsCash	24283000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	1547231000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	1333588000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33414000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	608000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1522000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	34936000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	757000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1684000	USD
CY2019Q3	us-gaap	Stock Granted During Period Value Sharebased Compensation Forfeited StockGrantedDuringPeriodValueSharebasedCompensationForfeited	0	USD
CY2019Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.18
CY2019Q3	us-gaap	Dividends Cash DividendsCash	19195000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	1351770000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1353285000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	39789000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	5749000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	14372000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	54161000	USD
	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	213406000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1006000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3769000	USD
	us-gaap	Stock Granted During Period Value Sharebased Compensation Forfeited StockGrantedDuringPeriodValueSharebasedCompensationForfeited	0	USD
	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	105000	USD
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.57
	us-gaap	Dividends Cash DividendsCash	68852000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	1547231000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1257638000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	84841000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	4799000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	11999000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	96840000	USD
	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	43288000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	6783000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5418000	USD
	us-gaap	Stock Granted During Period Value Sharebased Compensation Forfeited StockGrantedDuringPeriodValueSharebasedCompensationForfeited	0	USD
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.54
	us-gaap	Dividends Cash DividendsCash	56971000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	1351770000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	39789000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	84841000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	86205000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	14436000	USD
	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	2322000	USD
	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	490000	USD
	nwbi	Increase Decrease In Mortgage Banking IncreaseDecreaseInMortgageBanking	16676000	USD
	nwbi	Increase Decrease In Mortgage Banking IncreaseDecreaseInMortgageBanking	0	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	6625000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	927000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	28825000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	64306000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	79299000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	74974000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-2240000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-677000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	3769000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5418000	USD
	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	272000	USD
	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	548000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-15812000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1706000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	472121000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	31776000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	471367000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	23764000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	153810000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	110719000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	730096000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	123655000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	2694000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	3788000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	284532000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	178775000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	8000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	32389000	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	596000	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	2638000	USD
	nwbi	Originations Of Loans Receivable Held For Investment OriginationsOfLoansReceivableHeldForInvestment	3640293000	USD
	nwbi	Originations Of Loans Receivable Held For Investment OriginationsOfLoansReceivableHeldForInvestment	2724061000	USD
	nwbi	Proceeds From Maturities And Principal Reductions On Loans ProceedsFromMaturitiesAndPrincipalReductionsOnLoans	3132329000	USD
	nwbi	Proceeds From Maturities And Principal Reductions On Loans ProceedsFromMaturitiesAndPrincipalReductionsOnLoans	2288521000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	50791000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	46783000	USD
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-4684000	USD
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	5313000	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	1062000	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	3274000	USD
	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	455000	USD
	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	456000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	10808000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	9302000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-261712000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	25834000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-642334000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-331541000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1247573000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	307942000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	123247000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	112253000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-89504000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	20868000	USD
	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	-16790000	USD
	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	-18987000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	68852000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	56971000	USD
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1006000	USD
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	6783000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1084427000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	259635000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	595903000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	38813000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	60846000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	68789000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	595903000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	38813000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	656749000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	107602000	USD
	nwbi	Cash Paid For Interest On Deposits CashPaidForInterestOnDeposits	27668000	USD
	nwbi	Cash Paid For Interest On Deposits CashPaidForInterestOnDeposits	32893000	USD
	nwbi	Cash Paid For Interest On Deposits And Borrowings CashPaidForInterestOnDepositsAndBorrowings	33639000	USD
	nwbi	Cash Paid For Interest On Deposits And Borrowings CashPaidForInterestOnDepositsAndBorrowings	39632000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	21800000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	15052000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	2090599000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	580407000	USD
	us-gaap	Stock Issued1 StockIssued1	213406000	USD
	us-gaap	Stock Issued1 StockIssued1	43288000	USD
	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	42500000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Net Nonmonetary Assets Acquired Liabilities Assumed1 NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1	1877193000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Net Nonmonetary Assets Acquired Liabilities Assumed1 NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1	494619000	USD
	nwbi	Transfer Of Other Real Estate And Other Repossessed Personal Property TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty	4216000	USD
	nwbi	Transfer Of Other Real Estate And Other Repossessed Personal Property TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty	4349000	USD
	nwbi	Sale And Financing Of Other Real Estate Owned SaleAndFinancingOfOtherRealEstateOwned	0	USD
	nwbi	Sale And Financing Of Other Real Estate Owned SaleAndFinancingOfOtherRealEstateOwned	44000	USD
CY2020Q3	nwbi	Number Of Banking Locations NumberOfBankingLocations	213	bank
CY2020Q2	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	9.71
CY2020Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.13
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	743000	USD
CY2019Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1700000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3800000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5400000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2020Q3	nwbi	Debt Securities Held To Maturity Accrued Interest Receivable DebtSecuritiesHeldToMaturityAccruedInterestReceivable	1400000	USD
CY2019Q4	nwbi	Debt Securities Held To Maturity Accrued Interest Receivable DebtSecuritiesHeldToMaturityAccruedInterestReceivable	1500000	USD
CY2020Q3	nwbi	Debt Securities Available For Sale Accrued Interest Receivable DebtSecuritiesAvailableForSaleAccruedInterestReceivable	1700000	USD
CY2020Q3	nwbi	Debt Securities Available For Sale Accrued Interest Receivable DebtSecuritiesAvailableForSaleAccruedInterestReceivable	1700000	USD
CY2019Q4	nwbi	Debt Securities Available For Sale Accrued Interest Receivable DebtSecuritiesAvailableForSaleAccruedInterestReceivable	900000	USD
CY2020Q3	nwbi	Financing Receivable Accrued Interest Receivable FinancingReceivableAccruedInterestReceivable	33500000	USD
CY2019Q4	nwbi	Financing Receivable Accrued Interest Receivable FinancingReceivableAccruedInterestReceivable	23300000	USD
CY2020Q3	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	25100000	USD
CY2019Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	7700000	USD
	nwbi	Number Of Loan Segments NumberOfLoanSegments	7	segment
CY2020Q2	nwbi	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loans Receivable Discount BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivableDiscount	14700000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1385835000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	24376000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1061000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1409150000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	815495000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	7351000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2945000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	819901000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	15333000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	835000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	USD
CY2020Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	16168000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	18036000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	187000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	18223000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	15333000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	16168000	USD
CY2020Q3	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	281745000	USD
CY2020Q3	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1	940000	USD
CY2020Q3	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	8213000	USD
CY2020Q3	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	121000	USD
CY2020Q3	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	289958000	USD
CY2020Q3	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1	1061000	USD
CY2019Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	173112000	USD
CY2019Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1	858000	USD
CY2019Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	161944000	USD
CY2019Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	2087000	USD
CY2019Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	335056000	USD
CY2019Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1	2945000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	106	security
CY2020Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	15333000	USD
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	10781852000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	8808674000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	140209000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	57941000	USD
CY2020Q3	us-gaap	Notes Receivable Net NotesReceivableNet	10641643000	USD
CY2019Q4	us-gaap	Notes Receivable Net NotesReceivableNet	8750733000	USD
CY2020Q3	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	25100000	USD
CY2020Q3	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	34200000	USD
CY2019Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	40200000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	140209000	USD
CY2020Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	6818000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	8997000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1802000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Loss Purchased With Credit Deterioration Increase FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	0	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	140586000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	52859000	USD
CY2019Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3302000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	5274000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1724000	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	53107000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	140209000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	86205000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	28704000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	5130000	USD
	us-gaap	Financing Receivable Allowance For Credit Loss Purchased With Credit Deterioration Increase FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	8845000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	57941000	USD
	us-gaap	Allowance For Loan And Lease Losses Loans Sold AllowanceForLoanAndLeaseLossesLoansSold	50000000.0	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1300000	USD
CY2020Q3	us-gaap	Allowance For Loan And Lease Losses Loans Sold AllowanceForLoanAndLeaseLossesLoansSold	0	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	52859000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	14436000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	21485000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4694000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	55214000	USD
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	10781852000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	140209000	USD
CY2020Q3	nwbi	Financing Receivable Nonaccrual Including Nonaccrual With No Allowance FinancingReceivableNonaccrualIncludingNonaccrualWithNoAllowance	106798000	USD
CY2020Q3	nwbi	Financing Receivable Recorded Investment90 Days Or More Past Maturity And Still Accruing FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing	495000	USD
CY2020Q3	nwbi	Financing Receivable Troubled Debt Restructuring Excluding Nonaccrual FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual	34804000	USD
CY2020Q3	nwbi	Financing Receivable Allowance For Credit Loss Modifications FinancingReceivableAllowanceForCreditLossModifications	3475000	USD
CY2020Q3	nwbi	Financing Receivable Modifications Recorded Investment Additional Commitment FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment	682000	USD
CY2020Q3	nwbi	Financing Receivable Modifications Recorded Investment Non Accrual FinancingReceivableModificationsRecordedInvestmentNonAccrual	17100000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	8808674000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	57941000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	68870000	USD
CY2019Q4	nwbi	Financing Receivable Recorded Investment90 Days Or More Past Maturity And Still Accruing FinancingReceivableRecordedInvestment90DaysOrMorePastMaturityAndStillAccruing	32000	USD
CY2019Q4	nwbi	Financing Receivable Troubled Debt Restructuring Excluding Nonaccrual FinancingReceivableTroubledDebtRestructuringExcludingNonaccrual	31999000	USD
CY2019Q4	nwbi	Financing Receivable Allowance For Credit Loss Modifications FinancingReceivableAllowanceForCreditLossModifications	3002000	USD
CY2019Q4	nwbi	Financing Receivable Modifications Recorded Investment Additional Commitment FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment	566000	USD
CY2019Q4	nwbi	Financing Receivable Modifications Recorded Investment Non Accrual FinancingReceivableModificationsRecordedInvestmentNonAccrual	9000000.0	USD
CY2020Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	68870000	USD
CY2020Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	84482000	USD
CY2020Q3	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	22316000	USD
CY2020Q3	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	495000	USD
CY2020Q3	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	186000	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	574000	USD
CY2020Q3	nwbi	Financing Receivable Amortized Cost Of Collateral Dependent Loans FinancingReceivableAmortizedCostOfCollateralDependentLoans	43766000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	105993000	USD
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	88643000	USD
CY2019	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	3070000	USD
CY2019Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	8739372000	USD
CY2019Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	69302000	USD
CY2019Q4	nwbi	Financing Receivable Individually Evaluated For Impairment Reserved FinancingReceivableIndividuallyEvaluatedForImpairmentReserved	57999000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	11762000	USD
CY2019Q4	nwbi	Financing Receivable Individually Evaluated For Impairment Not Reserved FinancingReceivableIndividuallyEvaluatedForImpairmentNotReserved	11303000	USD
CY2020Q2	nwbi	Financing Receivable Modifications Outstanding Number Of Contracts FinancingReceivableModificationsOutstandingNumberOfContracts	167	contract
CY2020Q2	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	35450000	USD
CY2019Q2	nwbi	Financing Receivable Modifications Outstanding Number Of Contracts FinancingReceivableModificationsOutstandingNumberOfContracts	183	contract
CY2019Q2	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	31269000	USD
CY2020Q3	nwbi	Financing Receivable Modifications Number Of Contracts2 Additions FinancingReceivableModificationsNumberOfContracts2Additions	7	contract
CY2020Q3	nwbi	Financing Receivable Modifications Recorded Investment Additions FinancingReceivableModificationsRecordedInvestmentAdditions	803000	USD
CY2019Q3	nwbi	Financing Receivable Modifications Number Of Contracts2 Additions FinancingReceivableModificationsNumberOfContracts2Additions	3	contract
CY2019Q3	nwbi	Financing Receivable Modifications Recorded Investment Additions FinancingReceivableModificationsRecordedInvestmentAdditions	520000	USD
CY2020Q3	nwbi	Financing Receivable Modifications Number Of Contracts Remodified FinancingReceivableModificationsNumberOfContractsRemodified	3	contract
CY2020Q3	nwbi	Financing Receivable Modifications Recorded Investment Re Modifications FinancingReceivableModificationsRecordedInvestmentReModifications	6679000	USD
CY2019Q3	nwbi	Financing Receivable Modifications Number Of Contracts Remodified FinancingReceivableModificationsNumberOfContractsRemodified	8	contract
CY2019Q3	nwbi	Financing Receivable Modifications Recorded Investment Re Modifications FinancingReceivableModificationsRecordedInvestmentReModifications	4773000	USD
CY2020Q3	nwbi	Financing Receivable Modifications Number Of Contracts Net Paydowns FinancingReceivableModificationsNumberOfContractsNetPaydowns	0	contract
CY2020Q3	nwbi	Financing Receivable Modifications Recorded Investment Net Paydowns FinancingReceivableModificationsRecordedInvestmentNetPaydowns	8127000	USD
CY2019Q3	nwbi	Financing Receivable Modifications Number Of Contracts Net Paydowns FinancingReceivableModificationsNumberOfContractsNetPaydowns	0	contract
CY2019Q3	nwbi	Financing Receivable Modifications Recorded Investment Net Paydowns FinancingReceivableModificationsRecordedInvestmentNetPaydowns	5668000	USD
CY2020Q3	nwbi	Financing Receivable Modifications Outstanding Number Of Contracts FinancingReceivableModificationsOutstandingNumberOfContracts	173	contract
CY2020Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	34804000	USD
CY2019Q3	nwbi	Financing Receivable Modifications Outstanding Number Of Contracts FinancingReceivableModificationsOutstandingNumberOfContracts	177	contract
CY2019Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	30300000	USD
CY2020Q3	nwbi	Financing Receivable Modifications Recorded Investment Accrual FinancingReceivableModificationsRecordedInvestmentAccrual	17684000	USD
CY2019Q3	nwbi	Financing Receivable Modifications Recorded Investment Accrual FinancingReceivableModificationsRecordedInvestmentAccrual	21162000	USD
CY2020Q3	nwbi	Financing Receivable Modifications Recorded Investment Non Accrual FinancingReceivableModificationsRecordedInvestmentNonAccrual	17120000	USD
CY2019Q3	nwbi	Financing Receivable Modifications Recorded Investment Non Accrual FinancingReceivableModificationsRecordedInvestmentNonAccrual	9138000	USD
CY2019Q4	nwbi	Financing Receivable Modifications Outstanding Number Of Contracts FinancingReceivableModificationsOutstandingNumberOfContracts	176	contract
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	31999000	USD
CY2018Q4	nwbi	Financing Receivable Modifications Outstanding Number Of Contracts FinancingReceivableModificationsOutstandingNumberOfContracts	195	contract
CY2018Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	33608000	USD
	nwbi	Financing Receivable Modifications Number Of Contracts2 Additions FinancingReceivableModificationsNumberOfContracts2Additions	10	contract
	nwbi	Financing Receivable Modifications Recorded Investment Additions FinancingReceivableModificationsRecordedInvestmentAdditions	889000	USD
	nwbi	Financing Receivable Modifications Number Of Contracts2 Additions FinancingReceivableModificationsNumberOfContracts2Additions	5	contract
	nwbi	Financing Receivable Modifications Recorded Investment Additions FinancingReceivableModificationsRecordedInvestmentAdditions	826000	USD
	nwbi	Financing Receivable Modifications Number Of Contracts Remodified FinancingReceivableModificationsNumberOfContractsRemodified	5	contract
	nwbi	Financing Receivable Modifications Recorded Investment Re Modifications FinancingReceivableModificationsRecordedInvestmentReModifications	9720000	USD
	nwbi	Financing Receivable Modifications Number Of Contracts Remodified FinancingReceivableModificationsNumberOfContractsRemodified	8	contract
	nwbi	Financing Receivable Modifications Recorded Investment Re Modifications FinancingReceivableModificationsRecordedInvestmentReModifications	4773000	USD
	nwbi	Financing Receivable Modifications Number Of Contracts Net Paydowns FinancingReceivableModificationsNumberOfContractsNetPaydowns	0	contract
	nwbi	Financing Receivable Modifications Recorded Investment Net Paydowns FinancingReceivableModificationsRecordedInvestmentNetPaydowns	7192000	USD
	nwbi	Financing Receivable Modifications Number Of Contracts Net Paydowns FinancingReceivableModificationsNumberOfContractsNetPaydowns	0	contract
	nwbi	Financing Receivable Modifications Recorded Investment Net Paydowns FinancingReceivableModificationsRecordedInvestmentNetPaydowns	6454000	USD
CY2020Q3	nwbi	Financing Receivable Modifications Outstanding Number Of Contracts FinancingReceivableModificationsOutstandingNumberOfContracts	173	contract
CY2020Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	34804000	USD
CY2019Q3	nwbi	Financing Receivable Modifications Outstanding Number Of Contracts FinancingReceivableModificationsOutstandingNumberOfContracts	177	contract
CY2019Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	30300000	USD
CY2020Q3	nwbi	Financing Receivable Modifications Recorded Investment Accrual FinancingReceivableModificationsRecordedInvestmentAccrual	17684000	USD
CY2019Q3	nwbi	Financing Receivable Modifications Recorded Investment Accrual FinancingReceivableModificationsRecordedInvestmentAccrual	21162000	USD
CY2020Q3	nwbi	Financing Receivable Modifications Recorded Investment Non Accrual FinancingReceivableModificationsRecordedInvestmentNonAccrual	17120000	USD
CY2019Q3	nwbi	Financing Receivable Modifications Recorded Investment Non Accrual FinancingReceivableModificationsRecordedInvestmentNonAccrual	9138000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	10	contract
CY2020Q3	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	7630000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	7482000	USD
CY2020Q3	nwbi	Financing Receivable Modification Allowance For Credit Losses FinancingReceivableModificationAllowanceForCreditLosses	817000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	14	contract
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	10274000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	9615000	USD
	nwbi	Financing Receivable Modification Allowance For Credit Losses FinancingReceivableModificationAllowanceForCreditLosses	843000	USD
CY2019Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	11	contract
CY2019Q3	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	6202000	USD
CY2019Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	5293000	USD
CY2019Q3	nwbi	Financing Receivable Modification Allowance For Credit Losses FinancingReceivableModificationAllowanceForCreditLosses	563000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	13	contract
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	6512000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	5599000	USD
	nwbi	Financing Receivable Modification Allowance For Credit Losses FinancingReceivableModificationAllowanceForCreditLosses	596000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	10	contract
CY2020Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	7482000	USD
CY2019Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	11	contract
CY2019Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	5293000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	14	contract
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	9615000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	13	contract
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	5599000	USD
CY2020	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	contract
CY2020Q3	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	105707000	USD
CY2020Q3	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	10676145000	USD
CY2020Q3	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	10781852000	USD
CY2020Q3	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	495000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	119401000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	8689273000	USD
CY2019Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	8808674000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	147000	USD
CY2020Q3	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	2127314000	USD
CY2020Q3	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	1858331000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	1236816000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	1013782000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	748201000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	2767576000	USD
CY2020Q3	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	944770000	USD
CY2020Q3	us-gaap	Financing Receivable Revolving Converted To Term Loan FinancingReceivableRevolvingConvertedToTermLoan	85062000	USD
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	10781852000	USD
	nwbi	Financing Receivable Revolving Converted To Term Loan During The Period FinancingReceivableRevolvingConvertedToTermLoanDuringThePeriod	17200000	USD
	us-gaap	Financing Receivable Purchased With Credit Deterioration Amount At Purchase Price FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice	244546000	USD
	us-gaap	Financing Receivable Purchased With Credit Deterioration Allowance For Credit Loss At Acquisition Date FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate	8845000	USD
	us-gaap	Financing Receivable Purchased With Credit Deterioration Discount Premium FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium	-4154000	USD
	us-gaap	Financing Receivable Purchased With Credit Deterioration Amount At Par Value FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue	239855000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	38683000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	346103000	USD
CY2018Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	755000	USD
CY2019	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	551000	USD
CY2019	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference	966000	USD
CY2019Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	1170000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	21601000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	23076000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1781000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1702000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5192000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4909000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	6856000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5902000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	4681000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	3592000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	2692000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1819000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	307420000	USD
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	39941000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	386044000	USD
CY2020Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	398216000	USD
CY2020Q2	nwbi	Number Of Business Trusts Owned NumberOfBusinessTrustsOwned	5	businessTrust
CY2020Q2	nwbi	Number Of Business Trusts Acquired After Merger NumberOfBusinessTrustsAcquiredAfterMerger	2	businessTrust
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	38050000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33414000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	39789000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	84841000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	126855810	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	105517707	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	118088122	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	104626560	shares
CY2020Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	752837	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1055055	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	126855810	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	106270544	shares
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1871000	USD
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	118088122	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	105681615	shares
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.30
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.32
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.30
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
	nwbi	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Financial Instruments Total Unrealized Gains Losses Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisFinancialInstrumentsTotalUnrealizedGainsLossesPeriodIncreaseDecrease	0	USD
CY2019	nwbi	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Financial Instruments Total Unrealized Gains Losses Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisFinancialInstrumentsTotalUnrealizedGainsLossesPeriodIncreaseDecrease	0	USD
CY2020Q3	us-gaap	Derivative Asset Notional Amount DerivativeAssetNotionalAmount	774115000	USD
CY2020Q3	us-gaap	Derivative Assets DerivativeAssets	70208000	USD
CY2020Q3	us-gaap	Derivative Liability Notional Amount DerivativeLiabilityNotionalAmount	631231000	USD
CY2020Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	61918000	USD
CY2019Q4	us-gaap	Derivative Asset Notional Amount DerivativeAssetNotionalAmount	421026000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	21593000	USD
CY2019Q4	us-gaap	Derivative Liability Notional Amount DerivativeLiabilityNotionalAmount	432666000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	20991000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	67000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-35000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	0	USD
CY2020Q3	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	676000	USD
CY2020Q3	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-1195000	USD
CY2019Q3	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	1315000	USD
CY2019Q3	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-207000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1522000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	107000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	2000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-375000	USD
CY2020Q3	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	580000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-929000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	99000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	525000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
CY2019Q3	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	581000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-871000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	83000	USD
	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	12677000	USD
	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-1695000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-209000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	14372000	USD
	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	11376000	USD
	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-623000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	11999000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	5286000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-375000	USD
	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	1741000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-2786000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	297000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	4549000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-4000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000	USD
	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	1742000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-2618000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	250000	USD

Files In Submission

Name	View Source	Status
0001471265-20-000127-index-headers.html	Edgar Link	pending
0001471265-20-000127-index.html	Edgar Link	pending
0001471265-20-000127.txt	Edgar Link	pending
0001471265-20-000127-xbrl.zip	Edgar Link	pending
a2020-09x30nwbixexx311.htm	Edgar Link	pending
a2020-09x30nwbixexx312.htm	Edgar Link	pending
a2020-09x30nwbixexx321.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
nwbi-20200930.htm	Edgar Link	pending
nwbi-20200930.xsd	Edgar Link	pending
nwbi-20200930_cal.xml	Edgar Link	unprocessable
nwbi-20200930_def.xml	Edgar Link	unprocessable
nwbi-20200930_htm.xml	Edgar Link	completed
nwbi-20200930_lab.xml	Edgar Link	unprocessable
nwbi-20200930_pre.xml	Edgar Link	unprocessable
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$NWBI
Northwest Bancshares, Inc. Stock $nwbi

2020 Q4 Form 10-Q Financial Statement

#000147126520000127 Filed on November 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWBI Northwest Bancshares, Inc. Stock $nwbi

2020 Q4 Form 10-Q Financial Statement

#000147126520000127 Filed on November 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWBI
Northwest Bancshares, Inc. Stock $nwbi