$NWBI
Northwest Bancshares, Inc. Stock $nwbi

$nwbi Overview Financials Valuation SEC Filings Company Website

2013 Q4 Form 10-K Financial Statement

#000110465914014649 Filed on February 28, 2014

Income Statement

Concept	2013 Q4	2012 Q4	2012 Q3
Revenue	$77.05M	$83.32M	$83.88M
YoY Change	-7.53%	-5.89%	-6.59%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin			$4.971M
YoY Change			-17.11%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$2.400M	$2.300M	$3.500M
YoY Change	4.35%	155.56%	52.17%
% of Gross Profit
Operating Expenses			$4.971M
YoY Change			-17.11%
Operating Profit
YoY Change
Interest Expense	$14.81M	$17.04M	$18.22M
YoY Change	-13.12%	-23.48%	-20.85%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$29.47M	$22.37M	$22.21M
YoY Change	31.75%	3.36%	-5.65%
Income Tax	$9.095M	$6.040M	$6.518M
% Of Pretax Income	30.87%	27.01%	29.35%
Net Earnings	$20.40M	$16.30M	$15.70M
YoY Change	25.15%	7.24%	-5.99%
Net Earnings / Revenue	26.48%	19.56%	18.72%
Basic Earnings Per Share	$0.22	$0.18	$0.17
Diluted Earnings Per Share	$0.22	$0.18	$0.17
COMMON SHARES
Basic Shares Outstanding	94.19M shares	97.64M shares	94.42M shares
Diluted Shares Outstanding			94.61M shares

Balance Sheet

Concept	2013 Q4	2012 Q4	2012 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$391.9M	$451.7M	$638.1M
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	$146.1M	$138.8M	$135.5M
YoY Change	5.27%	5.05%	7.5%
Goodwill	$174.6M	$174.6M	$171.9M
YoY Change	0.0%	1.61%
Intangibles	$2.319M	$3.529M	$1.330M
YoY Change	-34.29%	66.23%
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	$7.880B	$7.943B	$8.048B
YoY Change	-0.79%	-0.19%	0.73%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.000M	$1.000M	$1.000M
YoY Change	0.0%	0.0%	0.0%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$156.0M	$860.0M	$856.0M
YoY Change	-81.86%	3.86%	3.26%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.000M	$1.000M	$1.000M
YoY Change	0.0%	0.0%	0.0%
LONG-TERM LIABILITIES
Long-Term Debt	$103.0M	$103.0M	$103.0M
YoY Change	0.0%	0.0%	0.0%
Other Long-Term Liabilities	$70.00M	$62.00M	$77.00M
YoY Change	12.9%	-7.46%	18.46%
Total Long-Term Liabilities	$173.0M	$165.0M	$180.0M
YoY Change	4.85%	-2.94%	7.14%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.000M	$1.000M	$1.000M
Total Long-Term Liabilities	$173.0M	$165.0M	$180.0M
Total Liabilities	$6.725B	$6.814B	$6.873B
YoY Change	-1.31%	0.17%	0.73%
SHAREHOLDERS EQUITY
Retained Earnings	$569.7M	$550.3M	$556.5M
YoY Change	3.53%	1.23%
Common Stock	$620.6M	$614.2M	$662.6M
YoY Change	1.05%	-7.01%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.155B	$1.127B	$1.176B
YoY Change
Total Liabilities & Shareholders Equity	$7.880B	$7.943B	$8.048B
YoY Change	-0.79%	-0.19%	0.73%

Cashflow Statement

Concept	2013 Q4	2012 Q4	2012 Q3
OPERATING ACTIVITIES
Net Income	$20.40M	$16.30M	$15.70M
YoY Change	25.15%	7.24%	-5.99%
Depreciation, Depletion And Amortization	$2.400M	$2.300M	$3.500M
YoY Change	4.35%	155.56%	52.17%
Cash From Operating Activities	$26.90M	$34.50M	$31.40M
YoY Change	-22.03%	484.75%	-19.9%
INVESTING ACTIVITIES
Capital Expenditures	-$6.700M	-$6.500M	-$3.200M
YoY Change	3.08%	-18.75%	23.08%
Acquisitions
YoY Change
Other Investing Activities	-$5.900M	-$98.70M	-$99.80M
YoY Change	-94.02%	-287.29%	-330.48%
Cash From Investing Activities	-$12.60M	-$105.1M	-$103.1M
YoY Change	-88.01%	-334.6%	-353.94%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-37.70M	-115.6M	-12.20M
YoY Change	-67.39%	246.11%	-90.02%
NET CHANGE
Cash From Operating Activities	26.90M	34.50M	31.40M
Cash From Investing Activities	-12.60M	-105.1M	-103.1M
Cash From Financing Activities	-37.70M	-115.6M	-12.20M
Net Change In Cash	-23.40M	-186.2M	-83.90M
YoY Change	-87.43%	-1176.3%	97.88%
FREE CASH FLOW
Cash From Operating Activities	$26.90M	$34.50M	$31.40M
Capital Expenditures	-$6.700M	-$6.500M	-$3.200M
Free Cash Flow	$33.60M	$41.00M	$34.60M
YoY Change	-18.05%	194.96%	-17.22%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2013Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2013Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2013Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	93652960	shares
CY2013Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	94243713	shares
CY2013	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	287289000	USD
CY2012	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	308254000	USD
CY2011	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	320100000	USD
CY2013	us-gaap	Interest Income Securities Mortgage Backed InterestIncomeSecuritiesMortgageBacked	12818000	USD
CY2012	us-gaap	Interest Income Securities Mortgage Backed InterestIncomeSecuritiesMortgageBacked	16738000	USD
CY2011	us-gaap	Interest Income Securities Mortgage Backed InterestIncomeSecuritiesMortgageBacked	23450000	USD
CY2013	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	4021000	USD
CY2012	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	2328000	USD
CY2011	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	2452000	USD
CY2013	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	7817000	USD
CY2012	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	9119000	USD
CY2011	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	11514000	USD
CY2013	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	1093000	USD
CY2013	us-gaap	Interest Expense InterestExpense	61162000	USD
CY2013	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	18519000	USD
CY2011	us-gaap	Interest Expense InterestExpense	92801000	USD
CY2012	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	1599000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	18255000	USD
CY2011	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	1712000	USD
CY2013	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	313038000	USD
CY2012	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	338038000	USD
CY2011	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	359228000	USD
CY2013	us-gaap	Interest Expense Deposits InterestExpenseDeposits	29279000	USD
CY2012	us-gaap	Interest Expense Deposits InterestExpenseDeposits	43377000	USD
CY2011	us-gaap	Interest Expense Deposits InterestExpenseDeposits	60721000	USD
CY2013	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	31883000	USD
CY2012	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	31822000	USD
CY2011	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	32080000	USD
CY2012	us-gaap	Interest Expense InterestExpense	75199000	USD
CY2013	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	251876000	USD
CY2012	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	262839000	USD
CY2011	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	266427000	USD
CY2012	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	26338000	USD
CY2013	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	233357000	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	30000000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1423000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3295000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7749000	USD
CY2013	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	36773000	USD
CY2012	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	248658000	USD
CY2011	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	77887000	USD
CY2013	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	52550000	USD
CY2012	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	236482000	USD
CY2011	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	88238000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	130842000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	127455000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	118702000	USD
CY2013	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	234965000	USD
CY2012	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	508553000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	237058000	USD
CY2013	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	33764000	USD
CY2012	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	76257000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	126012000	USD
CY2013	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	255064000	USD
CY2012	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	341287000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	297348000	USD
CY2013	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	16003000	USD
CY2011	nwbi	Originations Of Loans Receivable Held For Investment OriginationsOfLoansReceivableHeldForInvestment	1850368000	USD
CY2012	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	1911871000	USD
CY2011	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	1766191000	USD
CY2013	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-3119000	USD
CY2012	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-2101000	USD
CY2011	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-11145000	USD
CY2013	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	18036000	USD
CY2012	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	14049000	USD
CY2011	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	10648000	USD
CY2013	us-gaap	Payments To Acquire Real Estate Held For Investment PaymentsToAcquireRealEstateHeldForInvestment	-814000	USD
CY2012	us-gaap	Payments To Acquire Real Estate Held For Investment PaymentsToAcquireRealEstateHeldForInvestment	-457000	USD
CY2011	us-gaap	Payments To Acquire Real Estate Held For Investment PaymentsToAcquireRealEstateHeldForInvestment	22000	USD
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	19367000	USD
CY2013	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	8635000	USD
CY2012	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	6264000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	12434000	USD
CY2012	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	236501000	USD
CY2011	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	232257000	USD
CY2013	us-gaap	Impairment Of Investments ImpairmentOfInvestments	713000	USD
CY2011	us-gaap	Impairment Of Investments ImpairmentOfInvestments	2081000	USD
CY2012	nwbi	Noncredit Related Losses On Securities Not Expected To Be Sold NoncreditRelatedLossesOnSecuritiesNotExpectedToBeSold	665000	USD
CY2011	nwbi	Noncredit Related Losses On Securities Not Expected To Be Sold NoncreditRelatedLossesOnSecuritiesNotExpectedToBeSold	1144000	USD
CY2013	nwbi	Net Other Than Temporary Impairments NetOtherThanTemporaryImpairments	713000	USD
CY2012	nwbi	Net Other Than Temporary Impairments NetOtherThanTemporaryImpairments	331000	USD
CY2011	nwbi	Net Other Than Temporary Impairments NetOtherThanTemporaryImpairments	937000	USD
CY2013	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	6118000	USD
CY2012	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	654000	USD
CY2011	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	358000	USD
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CY2012	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	35623000	USD
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CY2013	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	9330000	USD
CY2012	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	8544000	USD
CY2011	us-gaap	Fees And Commissions Fiduciary And Trust Activities FeesAndCommissionsFiduciaryAndTrustActivities	8125000	USD
CY2011	us-gaap	Insurance Commissions And Fees InsuranceCommissionsAndFees	6548000	USD
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CY2012	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-5643000	USD
CY2011	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-2426000	USD
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CY2012	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4961000	USD
CY2011	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6019000	USD
CY2013	nwbi	Mortgage Banking Income MortgageBankingIncome	1623000	USD
CY2012	nwbi	Mortgage Banking Income MortgageBankingIncome	4678000	USD
CY2011	nwbi	Mortgage Banking Income MortgageBankingIncome	858000	USD
CY2013	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	3959000	USD
CY2012	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	4154000	USD
CY2011	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	4213000	USD
CY2013	us-gaap	Noninterest Income NoninterestIncome	66847000	USD
CY2012	us-gaap	Noninterest Income NoninterestIncome	58904000	USD
CY2011	us-gaap	Noninterest Income NoninterestIncome	58978000	USD
CY2013	us-gaap	Labor And Related Expense LaborAndRelatedExpense	112190000	USD
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CY2011	us-gaap	Labor And Related Expense LaborAndRelatedExpense	106595000	USD
CY2013	us-gaap	Occupancy Costs OccupancyCosts	23182000	USD
CY2012	us-gaap	Occupancy Costs OccupancyCosts	22409000	USD
CY2011	us-gaap	Occupancy Costs OccupancyCosts	23055000	USD
CY2013	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	14454000	USD
CY2012	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	13224000	USD
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	12850000	USD
CY2013	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	25548000	USD
CY2012	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	25000000	USD
CY2011	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	23332000	USD
CY2013	us-gaap	Professional Fees ProfessionalFees	6267000	USD
CY2012	us-gaap	Professional Fees ProfessionalFees	7005000	USD
CY2011	us-gaap	Professional Fees ProfessionalFees	5224000	USD
CY2013	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1210000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1012000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1819000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	63560000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	64151000	USD
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.74
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.68
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.64
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CY2012	us-gaap	Marketing Expense MarketingExpense	7829000	USD
CY2011	us-gaap	Marketing Expense MarketingExpense	9953000	USD
CY2013	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	2437000	USD
CY2012	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	2620000	USD
CY2011	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	1625000	USD
CY2013	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	5600000	USD
CY2012	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	5554000	USD
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CY2011	us-gaap	Other Noninterest Expense OtherNoninterestExpense	8673000	USD
CY2013	us-gaap	Noninterest Expense NoninterestExpense	207134000	USD
CY2012	us-gaap	Noninterest Expense NoninterestExpense	205477000	USD
CY2011	us-gaap	Noninterest Expense NoninterestExpense	200227000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	93070000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	89928000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	91008000	USD
CY2013	nwbi	State And Local Tax Expense Benefit StateAndLocalTaxExpenseBenefit	3055000	USD
CY2012	nwbi	State And Local Tax Expense Benefit StateAndLocalTaxExpenseBenefit	3884000	USD
CY2011	nwbi	State And Local Tax Expense Benefit StateAndLocalTaxExpenseBenefit	4234000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	66739000	USD
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.68
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-16544000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	2029000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	9312000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	435000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	202000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax	609000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	2977000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	424000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-1104000	USD
CY2013	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-19086000	USD
CY2012	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1807000	USD
CY2011	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	11025000	USD
CY2013	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	3181000	USD
CY2012	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	459000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-2787000	USD
CY2013	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	17002000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	9576000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-17863000	USD
CY2013	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-15493000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-9472000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	17967000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-412000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	11738000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9729000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	66327000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	75298000	USD
CY2012	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-15725000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-273440000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	111462000	USD
CY2013	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-95721000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	54422000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-10551000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1346000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	5996000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesTax	278000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesTax	129000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesTax	328000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1904000	USD
CY2013	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	1714000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	271000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-705000	USD
CY2012	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	246000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	-1506000	USD
CY2013	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-10716000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-6112000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	11431000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	1417000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	7506000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-5964000	USD
CY2013	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.50
CY2012	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.60
CY2011	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.43
CY2013	nwbi	Cash Paid For Interest On Deposits CashPaidForInterestOnDeposits	26329000	USD
CY2012	nwbi	Cash Paid For Interest On Deposits CashPaidForInterestOnDeposits	37633000	USD
CY2011	nwbi	Cash Paid For Interest On Deposits CashPaidForInterestOnDeposits	51591000	USD
CY2013	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	6061000	USD
CY2012	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	2894000	USD
CY2011	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	-2999000	USD
CY2013	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	8952000	USD
CY2012	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	9466000	USD
CY2011	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	7790000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-12351000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-18695000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-7534000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2890000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	11351000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-24967000	USD
CY2013	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-298000	USD
CY2012	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	76000	USD
CY2011	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	186000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	5083000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	4623000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	6725000	USD
CY2013	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	-713000	USD
CY2012	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	-331000	USD
CY2011	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	-937000	USD
CY2013	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	4158000	USD
CY2012	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	4942000	USD
CY2011	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	1449000	USD
CY2012	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	4089000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-76150000	USD
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-8334000	USD
CY2011	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	15989000	USD
CY2013	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	68000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	69000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	50066000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	32191000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-13302000	USD
CY2013	nwbi	Increase Decrease In Advances By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancesByBorrowersForTaxesAndInsurance	3344000	USD
CY2012	nwbi	Increase Decrease In Advances By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancesByBorrowersForTaxesAndInsurance	-246000	USD
CY2011	nwbi	Increase Decrease In Advances By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancesByBorrowersForTaxesAndInsurance	703000	USD
CY2013	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	4459000	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	52028000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	172690000	USD
CY2013	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	6618000	USD
CY2012	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2131000	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2030000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-114491000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-90608000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-260978000	USD
CY2013	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-59799000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-236593000	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-30814000	USD
CY2013	us-gaap	Payments Of Dividends PaymentsOfDividends	45871000	USD
CY2012	us-gaap	Payments Of Dividends PaymentsOfDividends	56862000	USD
CY2011	us-gaap	Payments Of Dividends PaymentsOfDividends	43642000	USD
CY2011Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	94276000	USD
CY2011Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	593388000	USD
CY2011Q4	nwbi	Federal Funds Sold And Other Short Term Investments FederalFundsSoldAndOtherShortTermInvestments	633000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	391905000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	451704000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	688297000	USD
CY2013	nwbi	Cash Paid For Interest On Deposits And Borrowings CashPaidForInterestOnDepositsAndBorrowings	61162000	USD
CY2012	nwbi	Cash Paid For Interest On Deposits And Borrowings CashPaidForInterestOnDepositsAndBorrowings	75415000	USD
CY2011	nwbi	Cash Paid For Interest On Deposits And Borrowings CashPaidForInterestOnDepositsAndBorrowings	93413000	USD
CY2013	us-gaap	Income Taxes Paid IncomeTaxesPaid	22881000	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	14278000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	23916000	USD
CY2012	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	4152000	USD
CY2012	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	63000	USD
CY2013	nwbi	Transfer Of Other Real Estate And Other Repossessed Personal Property TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty	14529000	USD
CY2012	nwbi	Transfer Of Other Real Estate And Other Repossessed Personal Property TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty	20080000	USD
CY2011	nwbi	Transfer Of Other Real Estate And Other Repossessed Personal Property TransferOfOtherRealEstateAndOtherRepossessedPersonalProperty	20410000	USD
CY2013	nwbi	Sale And Financing Of Other Real Estate Owned SaleAndFinancingOfOtherRealEstateOwned	943000	USD
CY2012	nwbi	Sale And Financing Of Other Real Estate Owned SaleAndFinancingOfOtherRealEstateOwned	461000	USD
CY2011	nwbi	Sale And Financing Of Other Real Estate Owned SaleAndFinancingOfOtherRealEstateOwned	379000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	719111000	USD
CY2013	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2013	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2013Q2	dei	Entity Public Float EntityPublicFloat	1268000000	USD
CY2013Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	98122000	USD
CY2012Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	88277000	USD
CY2013Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	293149000	USD
CY2012Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	362794000	USD
CY2013Q4	nwbi	Federal Funds Sold And Other Short Term Investments FederalFundsSoldAndOtherShortTermInvestments	634000	USD
CY2012Q4	nwbi	Federal Funds Sold And Other Short Term Investments FederalFundsSoldAndOtherShortTermInvestments	633000	USD
CY2013Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	1016767000	USD
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	1079074000	USD
CY2013Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	121366000	USD
CY2012Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	155081000	USD
CY2013Q4	us-gaap	Loans Receivable Net LoansReceivableNet	5734943000	USD
CY2012Q4	us-gaap	Loans Receivable Net LoansReceivableNet	5629261000	USD
CY2013Q4	us-gaap	Interest Receivable InterestReceivable	21821000	USD
CY2012Q4	us-gaap	Interest Receivable InterestReceivable	23313000	USD
CY2013Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	18203000	USD
CY2012Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	26165000	USD
CY2013Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	43715000	USD
CY2012Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	46834000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	146139000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	138824000	USD
CY2013Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	140172000	USD
CY2012Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	137044000	USD
CY2013Q4	us-gaap	Goodwill Goodwill	174463000	USD
CY2013Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	2319000	USD
CY2012Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	3529000	USD
CY2013Q4	us-gaap	Other Assets OtherAssets	69663000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	77310000	USD
CY2013Q4	us-gaap	Assets Assets	7881476000	USD
CY2012Q4	us-gaap	Assets Assets	7942600000	USD
CY2013	dei	Entity Registrant Name EntityRegistrantName	Northwest Bancshares, Inc.
CY2013	dei	Entity Central Index Key EntityCentralIndexKey	0001471265
CY2013	dei	Document Type DocumentType	10-K
CY2013	dei	Document Period End Date DocumentPeriodEndDate	2013-12-31
CY2013	dei	Amendment Flag AmendmentFlag	false
CY2013	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2013	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2013	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	94395060	shares
CY2013	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2013	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
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CY2012Q4	us-gaap	Common Stock Value CommonStockValue	937000	USD
CY2013Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	619678000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	613249000	USD
CY2013Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	571164000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	550296000	USD
CY2013Q4	us-gaap	Deposits Deposits	5668879000	USD
CY2012Q4	us-gaap	Deposits Deposits	5764600000	USD
CY2013Q4	us-gaap	Borrowed Funds BorrowedFunds	881645000	USD
CY2012Q4	us-gaap	Borrowed Funds BorrowedFunds	860047000	USD
CY2013Q4	us-gaap	Advance Payments By Borrowers For Taxes And Insurance AdvancePaymentsByBorrowersForTaxesAndInsurance	26669000	USD
CY2012Q4	us-gaap	Advance Payments By Borrowers For Taxes And Insurance AdvancePaymentsByBorrowersForTaxesAndInsurance	23325000	USD
CY2013Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	888000	USD
CY2012Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	888000	USD
CY2013Q4	us-gaap	Other Liabilities OtherLiabilities	43499000	USD
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	62177000	USD
CY2013Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	103094000	USD
CY2012Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	103094000	USD
CY2013Q4	us-gaap	Liabilities Liabilities	6724674000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	6814131000	USD
CY2013Q4	nwbi	Unallocated Common Stock Held By Esop UnallocatedCommonStockHeldByESOP	23083000	USD
CY2012Q4	nwbi	Unallocated Common Stock Held By Esop UnallocatedCommonStockHeldByESOP	24525000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-11900000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-11488000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	1156802000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	1128469000	USD
CY2013Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7881476000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7942600000	USD
CY2013Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1022078000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1053122000	USD
CY2013Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	124061000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	161969000	USD
CY2013Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2013Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2013Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	29452000	USD
CY2013	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-size:10.0pt;font-family:Times New Roman;"> <p style="MARGIN: 0in 0in 0pt 0.5in;"><b><i><font style="FONT-STYLE: italic; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold;" size="2">(s)</font></i></b><b><i><font style="FONT-STYLE: italic; FONT-SIZE: 3pt; FONT-WEIGHT: bold;" size="1">                                  </font></i></b> <b><i><font style="FONT-STYLE: italic; FONT-SIZE: 10pt; FONT-WEIGHT: bold;" size="2">Use of Estimates</font></i></b></p> <p style="MARGIN: 0in 0in 0pt 0.5in;"> </p> <p style="TEXT-INDENT: 0.5in; MARGIN: 0in 0in 0pt;"><font style="FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt;" size="2">The preparation of financial statements, in conformity with accounting principles generally accepted in the United States of America, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amount of revenues and expenses during the reporting period. The estimates and assumptions that we deem important to our financial statements relate to the allowance for loan losses, the accounting treatment and valuation of our investment securities portfolio, the analysis of the carrying value of goodwill and income taxes.  These estimates and assumptions are based on management’s best estimates and judgment and we evaluate them using historical experience and other factors, including the current economic environment.  We adjust our estimates and assumptions when facts and circumstances dictate.  As future events cannot be determined, actual results could differ significantly from our estimates.</font></p> </div>
CY2013	us-gaap	Comparability Of Prior Year Financial Data ComparabilityOfPriorYearFinancialData	<div style="font-size:10.0pt;font-family:Times New Roman;"> <p style="MARGIN: 0in 0in 0pt 0.5in;"><b><i><font style="FONT-STYLE: italic; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold;" size="2">(t)</font></i></b><b><i><font style="FONT-STYLE: italic; FONT-SIZE: 3pt; FONT-WEIGHT: bold;" size="1">                                   </font></i></b> <b><i><font style="FONT-STYLE: italic; FONT-SIZE: 10pt; FONT-WEIGHT: bold;" size="2">Reclassification of Prior Years’ Statements</font></i></b></p> <p style="MARGIN: 0in 0in 0pt 0.5in;"> </p> <p style="TEXT-INDENT: 0.5in; MARGIN: 0in 0in 0pt;"><font style="FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt;" size="2">Certain items previously reported have been reclassified to conform with the current year’s reporting format.</font></p> </div>
CY2013Q4	nwbi	Number Of Banking Locations NumberOfBankingLocations	165	item
CY2013Q4	nwbi	Number Of Consumer Finance Offices NumberOfConsumerFinanceOffices	50	item
CY2013	nwbi	Maximum Term Of Original Maturity To Classify Instruments As Cash And Cash Equivalents MaximumTermOfOriginalMaturityToClassifyInstrumentsAsCashAndCashEquivalents	P3M
CY2013	nwbi	Period To Return Troubled Debt Restructured Loans Included In Non Performing Loans To Performing Status PeriodToReturnTroubledDebtRestructuredLoansIncludedInNonPerformingLoansToPerformingStatus	P6M
CY2013Q4	us-gaap	Loans Held For Sale Mortgages LoansHeldForSaleMortgages	221000	USD
CY2012Q4	us-gaap	Loans Held For Sale Mortgages LoansHeldForSaleMortgages	15400000	USD
CY2012Q4	nwbi	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	30279000	USD
CY2013Q4	nwbi	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	15257000	USD
CY2012Q4	nwbi	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	4327000	USD
CY2013Q4	nwbi	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	20568000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	155081000	USD
CY2013Q4	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	121366000	USD
CY2013	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	713000	USD
CY2012Q4	nwbi	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	6902000	USD
CY2013Q4	nwbi	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	2755000	USD
CY2012Q4	nwbi	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	14000	USD
CY2013Q4	nwbi	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	60000	USD
CY2012Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	238873000	USD
CY2013Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	452468000	USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue		USD
CY2012Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1	1401000	USD
CY2013Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1	15690000	USD
CY2012Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	37237000	USD
CY2013Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	175906000	USD
CY2012Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	2940000	USD
CY2013Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	4938000	USD
CY2012Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	276110000	USD
CY2013Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Fair Value HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	628374000	USD
CY2012Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1	4341000	USD
CY2013Q4	nwbi	Held To Maturity And Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses1 HeldToMaturityAndAvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1	20628000	USD
CY2013Q4	us-gaap	Cost Method Investments CostMethodInvestments	1138000000	USD
CY2013	nwbi	Number Of Investment Positions With Unrealized Losses NumberOfInvestmentPositionsWithUnrealizedLosses	119	item
CY2012	nwbi	Financing Receivable Modifications Number Of Contract FinancingReceivableModificationsNumberOfContract	225	item
CY2011	nwbi	Financing Receivable Modifications Number Of Contract FinancingReceivableModificationsNumberOfContract	47	item
CY2013	nwbi	Financing Receivable Modifications Number Of Contract FinancingReceivableModificationsNumberOfContract	276	item
CY2013	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	121	item
CY2013Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	10342000	USD
CY2012Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	9811000	USD
CY2013Q4	us-gaap	Loans Receivable With Variable Rates Of Interest1 LoansReceivableWithVariableRatesOfInterest1	1771000000	USD
CY2012Q4	us-gaap	Loans Receivable With Fixed Rates Of Interest1 LoansReceivableWithFixedRatesOfInterest1	4021000000	USD
CY2011Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	11633000	USD
CY2013	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	182000	USD
CY2012	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	2153000	USD
CY2012	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	331000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	5792509000	USD
CY2013Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	5907258000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	1624000	USD
CY2013Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	-2461000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	73219000	USD
CY2013Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	71348000	USD
CY2012Q4	us-gaap	Qualitative And Quantitative Information Asset Or Liability Transferors Continuing Involvement Securitization Or Assetbacked Financing Principal Amount Outstanding Derecognized Amount QualitativeAndQuantitativeInformationAssetOrLiabilityTransferorsContinuingInvolvementSecuritizationOrAssetbackedFinancingPrincipalAmountOutstandingDerecognizedAmount	1036000000	USD
CY2011Q4	us-gaap	Qualitative And Quantitative Information Asset Or Liability Transferors Continuing Involvement Securitization Or Assetbacked Financing Principal Amount Outstanding Derecognized Amount QualitativeAndQuantitativeInformationAssetOrLiabilityTransferorsContinuingInvolvementSecuritizationOrAssetbackedFinancingPrincipalAmountOutstandingDerecognizedAmount	1150000000	USD
CY2013Q4	us-gaap	Qualitative And Quantitative Information Asset Or Liability Transferors Continuing Involvement Securitization Or Assetbacked Financing Principal Amount Outstanding Derecognized Amount QualitativeAndQuantitativeInformationAssetOrLiabilityTransferorsContinuingInvolvementSecuritizationOrAssetbackedFinancingPrincipalAmountOutstandingDerecognizedAmount	851400000	USD
CY2012Q4	nwbi	Percentage Of Financing Receivable Portfolio Secured By Properties PercentageOfFinancingReceivablePortfolioSecuredByProperties	0.75	pure
CY2013Q4	nwbi	Percentage Of Financing Receivable Portfolio Secured By Properties PercentageOfFinancingReceivablePortfolioSecuredByProperties	0.76	pure
CY2012Q4	us-gaap	Loans Receivable With Variable Rates Of Interest1 LoansReceivableWithVariableRatesOfInterest1	1772000000	USD
CY2013Q4	us-gaap	Loans Receivable With Fixed Rates Of Interest1 LoansReceivableWithFixedRatesOfInterest1	4136000000	USD
CY2012	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	30453000	USD
CY2013	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	25844000	USD
CY2012	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	6196000	USD
CY2013	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	5454000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	71138000	USD
CY2010Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	76412000	USD
CY2011	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	34170000	USD
CY2011	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	42364000	USD
CY2011	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	2920000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	5702480000	USD
CY2012Q4	nwbi	Loans And Leases Receivable Allowance Excluding Unallocated LoansAndLeasesReceivableAllowanceExcludingUnallocated	69193000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	120212000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1698000	USD
CY2012Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	89444000	USD
CY2012Q4	us-gaap	Allowance For Credit Losses Change In Method Of Calculating Impairment AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment	12774000	USD
CY2012Q4	nwbi	Financing Receivable Modifications Recorded Investment Additional Commitment FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment	2987000	USD
CY2013Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	5806291000	USD
CY2013Q4	nwbi	Loans And Leases Receivable Allowance Excluding Unallocated LoansAndLeasesReceivableAllowanceExcludingUnallocated	66686000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	107221000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	690000	USD
CY2013Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	79166000	USD
CY2013	nwbi	Guarantee Obligations Recourse Provisions Amount GuaranteeObligationsRecourseProvisionsAmount	0	USD
CY2013Q4	us-gaap	Allowance For Credit Losses Change In Method Of Calculating Impairment AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment	8515000	USD
CY2012	nwbi	Guarantee Obligations Recourse Provisions Amount GuaranteeObligationsRecourseProvisionsAmount	0	USD
CY2013Q4	nwbi	Financing Receivable Modifications Recorded Investment Additional Commitment FinancingReceivableModificationsRecordedInvestmentAdditionalCommitment	755000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-6056000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-9904000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	11487000	USD
CY2013Q4	nwbi	Financing Receivable Modifications Recorded Investment Non Accrual FinancingReceivableModificationsRecordedInvestmentNonAccrual	28889000	USD
CY2012Q4	nwbi	Financing Receivable Modifications Recorded Investment Non Accrual FinancingReceivableModificationsRecordedInvestmentNonAccrual	41166000	USD
CY2013Q4	nwbi	Amortized Cost Of Marketable Securities For Which Other Than Temporary Impairment Losses Recognized In Earnings AmortizedCostOfMarketableSecuritiesForWhichOtherThanTemporaryImpairmentLossesRecognizedInEarnings	20413000	USD
CY2013Q4	nwbi	Fair Value Of Marketable Securities For Which Other Than Temporary Impairment Losses Recognized In Earnings FairValueOfMarketableSecuritiesForWhichOtherThanTemporaryImpairmentLossesRecognizedInEarnings	22292000	USD
CY2013	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest	-1879000	USD
CY2013Q4	nwbi	Other Than Temporary Impairment Losses Recognized In Earnings On Marketable Securities OtherThanTemporaryImpairmentLossesRecognizedInEarningsOnMarketableSecurities	15507000	USD
CY2013Q4	nwbi	Accrued Interest Receivable On Investments AccruedInterestReceivableOnInvestments	2205000	USD
CY2013Q4	nwbi	Accrued Interest Receivable On Mortgage Backed Securities AccruedInterestReceivableOnMortgageBackedSecurities	1079000	USD
CY2012Q4	nwbi	Accrued Interest Receivable On Mortgage Backed Securities AccruedInterestReceivableOnMortgageBackedSecurities	1359000	USD
CY2013Q4	nwbi	Accrued Interest Receivable On Loans AccruedInterestReceivableOnLoans	18537000	USD
CY2012Q4	nwbi	Accrued Interest Receivable On Loans AccruedInterestReceivableOnLoans	19600000	USD
CY2012Q4	nwbi	Accrued Interest Receivable On Investments AccruedInterestReceivableOnInvestments	2354000	USD
CY2013	nwbi	Minimum Investment In Federal Home Loan Bank Stock As Percentage Of Borrowings Outstanding MinimumInvestmentInFederalHomeLoanBankStockAsPercentageOfBorrowingsOutstanding	0.0400	pure
CY2013	nwbi	Minimum Investment In Federal Home Loan Bank Stock As Percentage Of Asset Value Defined By Fhlb MinimumInvestmentInFederalHomeLoanBankStockAsPercentageOfAssetValueDefinedByFHLB	0.0035	pure
CY2013	nwbi	Minimum Investment In Federal Home Loan Bank Stock As Percentage Of Certain Letters Of Credit MinimumInvestmentInFederalHomeLoanBankStockAsPercentageOfCertainLettersOfCredit	0.0160	pure
CY2013	nwbi	Excess Stock Repurchased By Fhlb ExcessStockRepurchasedByFHLB	3100000	USD
CY2013	nwbi	Federal Home Loan Bank Stock Dividend Received FederalHomeLoanBankStockDividendReceived	371000	USD
CY2012	nwbi	Excess Stock Repurchased By Fhlb ExcessStockRepurchasedByFHLB	2100000	USD
CY2012	nwbi	Federal Home Loan Bank Stock Dividend Received FederalHomeLoanBankStockDividendReceived	87000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	290819000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	275206000	USD
CY2013Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	144680000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	136382000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	11900000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	11500000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	11700000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	3808000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	3068000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	2636000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	2099000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	1547000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	5144000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	18302000	USD
CY2013	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	4200000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	4900000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	4300000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	814000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	571000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	415000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	259000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	173000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	171882000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	174461000	USD
CY2012	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	2579000	USD
CY2013	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	2000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	871580000	USD
CY2013Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1191584000	USD
CY2013Q4	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	852809000	USD
CY2013Q4	us-gaap	Noninterest Bearing Domestic Deposit Checking NoninterestBearingDomesticDepositChecking	789135000	USD
CY2013Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	1167954000	USD
CY2013Q4	us-gaap	Time Deposits TimeDeposits	1667397000	USD
CY2012Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1158795000	USD
CY2012Q4	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	851771000	USD
CY2012Q4	us-gaap	Noninterest Bearing Domestic Deposit Checking NoninterestBearingDomesticDepositChecking	755429000	USD
CY2012Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	1112516000	USD
CY2012Q4	us-gaap	Time Deposits TimeDeposits	1886089000	USD
CY2013Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	413100000	USD
CY2013	nwbi	Number Of Customers Participating In Certificate Of Deposit Account Registry Service Program NumberOfCustomersParticipatingInCertificateOfDepositAccountRegistryServiceProgram	12	item
CY2012Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	475500000	USD
CY2013Q4	nwbi	Deposits Under Certificate Of Deposit Account Registry Service Program DepositsUnderCertificateOfDepositAccountRegistryServiceProgram	985000	USD
CY2013Q4	nwbi	Maximum Amount Of Deposits That Are Federally Insured MaximumAmountOfDepositsThatAreFederallyInsured	250000	USD
CY2013Q4	nwbi	Deposits250000 Or More Deposits250000OrMore	1032000000	USD
CY2013Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	665779000	USD
CY2013Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	297653000	USD
CY2013Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	325281000	USD
CY2013Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	276858000	USD
CY2013Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	93278000	USD
CY2013Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	8548000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	232392000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	206578000	USD
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	99802000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	93913000	shares
CY2013Q4	nwbi	Bad Debt Deduction For Which No Deferred Taxes Have Been Provided BadDebtDeductionForWhichNoDeferredTaxesHaveBeenProvided	39100000	USD
CY2012Q4	nwbi	Bad Debt Deduction For Which No Deferred Taxes Have Been Provided BadDebtDeductionForWhichNoDeferredTaxesHaveBeenProvided	39100000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	275723000	USD
CY2012Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	281683000	USD
CY2012Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	18133000	USD
CY2013	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	3595000	USD
CY2012	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	4219000	USD
CY2011	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	5000000	USD
CY2013	us-gaap	Interest Expense Domestic Deposit Liabilities Checking InterestExpenseDomesticDepositLiabilitiesChecking	576000	USD
CY2012	us-gaap	Interest Expense Domestic Deposit Liabilities Checking InterestExpenseDomesticDepositLiabilitiesChecking	792000	USD
CY2011	us-gaap	Interest Expense Domestic Deposit Liabilities Checking InterestExpenseDomesticDepositLiabilitiesChecking	960000	USD
CY2013	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	3042000	USD
CY2012	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	3605000	USD
CY2011	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	4243000	USD
CY2013	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	22066000	USD
CY2012	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	34761000	USD
CY2011	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	50518000	USD
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	90626000	shares
CY2011	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	376000	shares
CY2012	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	288000	shares
CY2013	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	845000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	100178000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	94201000	shares
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	91471000	shares
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26368000	USD
CY2012	nwbi	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Available For Sale Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesAvailableForSaleArisingDuringPeriodTax	1204000	USD
CY2012	nwbi	Tax Benefit From Excess Of Fair Value Over Cost Of Stock Benefit Plans TaxBenefitFromExcessOfFairValueOverCostOfStockBenefitPlans	403000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	246000	USD
CY2012	nwbi	Business Acquisition Purchase Price Allocation Goodwill BusinessAcquisitionPurchasePriceAllocationGoodwill	863000	USD
CY2012	nwbi	Income Tax Expense Benefit Unallocated IncomeTaxExpenseBenefitUnallocated	34334000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26331000	USD
CY2013	nwbi	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Available For Sale Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesAvailableForSaleArisingDuringPeriodTax	-12177000	USD
CY2013	nwbi	Tax Benefit From Excess Of Fair Value Over Cost Of Stock Benefit Plans TaxBenefitFromExcessOfFairValueOverCostOfStockBenefitPlans	635000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1714000	USD
CY2013	nwbi	Income Tax Expense Benefit Unallocated IncomeTaxExpenseBenefitUnallocated	25137000	USD
CY2011	nwbi	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Available For Sale Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesAvailableForSaleArisingDuringPeriodTax	7029000	USD
CY2011	nwbi	Tax Benefit From Excess Of Fair Value Over Cost Of Stock Benefit Plans TaxBenefitFromExcessOfFairValueOverCostOfStockBenefitPlans	610000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-1506000	USD
CY2011	nwbi	Income Tax Expense Benefit Unallocated IncomeTaxExpenseBenefitUnallocated	20283000	USD
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	24908000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	23073000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	19108000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26857000	USD
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.050	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.028	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Life Insurance EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance	-0.019	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.013	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003	pure
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.293	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.043	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.021	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Life Insurance EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance	-0.019	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.011	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.001	pure
CY2013	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.283	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.054	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.029	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Life Insurance EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance	-0.023	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.009	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.008	pure
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.295	pure
CY2012Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	280000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	3463000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	482000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	20639000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	734000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1128000	USD
CY2012Q4	nwbi	Deferred Tax Asset From Investment Securities Write Down DeferredTaxAssetFromInvestmentSecuritiesWriteDown	6032000	USD
CY2012Q4	nwbi	Deferred Tax Asset Expense Resulting From Increase Decrease In Uncollected Interest Reserve DeferredTaxAssetExpenseResultingFromIncreaseDecreaseInUncollectedInterestReserve	4194000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	890000	USD
CY2012Q4	nwbi	Deferred Tax Assets Expense Compensation And Pension Benefits And Other Postretirement Benefits DeferredTaxAssetsExpenseCompensationAndPensionBenefitsAndOtherPostretirementBenefits	12106000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	4527000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	582000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	55057000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	197000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	3727000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	208000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	20700000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	716000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1379000	USD
CY2013Q4	nwbi	Deferred Tax Asset From Investment Securities Write Down DeferredTaxAssetFromInvestmentSecuritiesWriteDown	5301000	USD
CY2013Q4	nwbi	Deferred Tax Asset Expense Resulting From Increase Decrease In Uncollected Interest Reserve DeferredTaxAssetExpenseResultingFromIncreaseDecreaseInUncollectedInterestReserve	2477000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	928000	USD
CY2013Q4	nwbi	Deferred Tax Assets Expense Compensation And Pension Benefits And Other Postretirement Benefits DeferredTaxAssetsExpenseCompensationAndPensionBenefitsAndOtherPostretirementBenefits	2202000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	2813000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	758000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	43485000	USD
CY2012Q4	nwbi	Deferred Tax Liabilities Pension Costs DeferredTaxLiabilitiesPensionCosts	5606000	USD
CY2012Q4	nwbi	Deferred Tax Liabilities Available For Sale Securities DeferredTaxLiabilitiesAvailableForSaleSecurities	10098000	USD
CY2012Q4	nwbi	Deferred Tax Liabilities Purchase Accounting DeferredTaxLiabilitiesPurchaseAccounting	1808000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	17958000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	1151000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	7814000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	821000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	45256000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	9801000	USD
CY2013Q4	nwbi	Deferred Tax Liabilities Pension Costs DeferredTaxLiabilitiesPensionCosts	4827000	USD
CY2013Q4	nwbi	Deferred Tax Liabilities Purchase Accounting DeferredTaxLiabilitiesPurchaseAccounting	1723000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	19438000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	677000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	7409000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	474000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	34548000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	8937000	USD
CY2013	nwbi	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Financial Instruments Total Unrealized Gains Losses Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisFinancialInstrumentsTotalUnrealizedGainsLossesPeriodIncreaseDecrease	0	USD
CY2012	nwbi	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Financial Instruments Total Unrealized Gains Losses Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisFinancialInstrumentsTotalUnrealizedGainsLossesPeriodIncreaseDecrease	0	USD
CY2013Q4	nwbi	Fair Value Assets Amount Transfers Between Level1 And Level2 FairValueAssetsAmountTransfersBetweenLevel1AndLevel2	0	USD
CY2013Q4	nwbi	Fair Value Liabilities Amount Transfers Between Level1 And Level2 FairValueLiabilitiesAmountTransfersBetweenLevel1AndLevel2	0	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-5224000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	3443000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-13497000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-23226000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-11811000	USD
CY2012Q4	us-gaap	Assets Fair Value Disclosure Nonrecurring AssetsFairValueDisclosureNonrecurring	113252000	USD
CY2013Q4	us-gaap	Assets Fair Value Disclosure Nonrecurring AssetsFairValueDisclosureNonrecurring	80933000	USD
CY2013Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	2300000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	15853000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-8405000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	18936000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-3233000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	10238000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	1214000	USD
CY2012	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-1500000	USD
CY2013	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	1626000	USD
CY2011	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-2082000	USD
CY2013	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	item
CY2011Q4	us-gaap	Assets Assets	7957705000	USD
CY2011Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	90907000	USD
CY2011Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	89997000	USD
CY2011Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	89789000	USD
CY2011Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	88535000	USD
CY2011Q1	us-gaap	Interest Expense InterestExpense	24052000	USD
CY2011Q2	us-gaap	Interest Expense InterestExpense	23462000	USD
CY2011Q3	us-gaap	Interest Expense InterestExpense	23019000	USD
CY2011Q4	us-gaap	Interest Expense InterestExpense	22268000	USD
CY2011Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	66855000	USD
CY2011Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	66535000	USD
CY2011Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	66770000	USD
CY2011Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	66267000	USD
CY2011Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	7244000	USD
CY2011Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	8367000	USD
CY2011Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	8057000	USD
CY2011Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	10502000	USD
CY2011Q1	us-gaap	Noninterest Income NoninterestIncome	14511000	USD
CY2011Q2	us-gaap	Noninterest Income NoninterestIncome	15406000	USD
CY2011Q3	us-gaap	Noninterest Income NoninterestIncome	14752000	USD
CY2011Q4	us-gaap	Noninterest Income NoninterestIncome	14309000	USD
CY2011Q1	us-gaap	Noninterest Expense NoninterestExpense	49378000	USD
CY2011Q2	us-gaap	Noninterest Expense NoninterestExpense	52490000	USD
CY2011Q3	us-gaap	Noninterest Expense NoninterestExpense	49923000	USD
CY2011Q4	us-gaap	Noninterest Expense NoninterestExpense	48436000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	24744000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	21084000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	23542000	USD
CY2011Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	21638000	USD
CY2011Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7491000	USD
CY2011Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6081000	USD
CY2011Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6822000	USD
CY2011Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6463000	USD
CY2011Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	17253000	USD
CY2011Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	15003000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	16720000	USD
CY2011Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	15175000	USD
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.15
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.17
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.15
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
CY2012Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	86034000	USD
CY2012Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	84808000	USD
CY2012Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	83876000	USD
CY2012Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	83320000	USD
CY2012Q1	us-gaap	Interest Expense InterestExpense	20843000	USD
CY2012Q2	us-gaap	Interest Expense InterestExpense	19096000	USD
CY2012Q3	us-gaap	Interest Expense InterestExpense	18220000	USD
CY2012Q4	us-gaap	Interest Expense InterestExpense	17040000	USD
CY2012Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	65191000	USD
CY2012Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	65712000	USD
CY2012Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	65656000	USD
CY2012Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	66280000	USD
CY2012Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6287000	USD
CY2012Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	4963000	USD
CY2012Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6915000	USD
CY2012Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	8173000	USD
CY2012Q1	us-gaap	Noninterest Income NoninterestIncome	13855000	USD
CY2012Q2	us-gaap	Noninterest Income NoninterestIncome	15086000	USD
CY2012Q3	us-gaap	Noninterest Income NoninterestIncome	15273000	USD
CY2012Q4	us-gaap	Noninterest Income NoninterestIncome	14690000	USD
CY2012Q1	us-gaap	Noninterest Expense NoninterestExpense	51276000	USD
CY2012Q2	us-gaap	Noninterest Expense NoninterestExpense	51966000	USD
CY2012Q3	us-gaap	Noninterest Expense NoninterestExpense	51803000	USD
CY2012Q4	us-gaap	Noninterest Expense NoninterestExpense	50432000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	21483000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	23869000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	22211000	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	22365000	USD
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.18
CY2013Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	79633000	USD
CY2012Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6040000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	15181000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	16361000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	15693000	USD
CY2012Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	16325000	USD
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.17
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.17
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.18
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
CY2012Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6302000	USD
CY2012Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7508000	USD
CY2012Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6518000	USD
CY2013Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	78763000	USD
CY2013Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	77788000	USD
CY2013Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	76854000	USD
CY2013Q1	us-gaap	Interest Expense InterestExpense	15645000	USD
CY2013Q2	us-gaap	Interest Expense InterestExpense	15436000	USD
CY2013Q3	us-gaap	Interest Expense InterestExpense	15276000	USD
CY2013Q4	us-gaap	Interest Expense InterestExpense	14805000	USD
CY2013Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	63988000	USD
CY2013Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	63327000	USD
CY2013Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	62512000	USD
CY2013Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	62049000	USD
CY2013Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	7158000	USD
CY2013Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	5405000	USD
CY2013Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	4992000	USD
CY2013Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	964000	USD
CY2013Q1	us-gaap	Noninterest Income NoninterestIncome	16378000	USD
CY2013Q2	us-gaap	Noninterest Income NoninterestIncome	13413000	USD
CY2013Q3	us-gaap	Noninterest Income NoninterestIncome	16109000	USD
CY2013Q4	us-gaap	Noninterest Income NoninterestIncome	20947000	USD
CY2013Q1	us-gaap	Noninterest Expense NoninterestExpense	51471000	USD
CY2013Q2	us-gaap	Noninterest Expense NoninterestExpense	52806000	USD
CY2013Q3	us-gaap	Noninterest Expense NoninterestExpense	50277000	USD
CY2013Q4	us-gaap	Noninterest Expense NoninterestExpense	52580000	USD
CY2013Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	21737000	USD
CY2013Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	18529000	USD
CY2013Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	23352000	USD
CY2013Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6439000	USD
CY2013Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5051000	USD
CY2013Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5752000	USD
CY2013Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9089000	USD
CY2013Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	15298000	USD
CY2013Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	13478000	USD
CY2013Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	17600000	USD
CY2013Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	20363000	USD
CY2013Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.17
CY2013Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.15
CY2013Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
CY2013Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2013Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
CY2013Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.15
CY2013Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2013Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
CY2013Q4	nwbi	Number Of Business Trusts Owned NumberOfBusinessTrustsOwned	2	item
CY2013	us-gaap	Amount Of Ineffectiveness On Net Investment Hedges AmountOfIneffectivenessOnNetInvestmentHedges	0	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	57757000	USD
CY2013Q4	nwbi	Financing Receivable Recorded Investment Less Than90 Days Past Due FinancingReceivableRecordedInvestmentLessThan90DaysPastDue	49464000	USD
CY2013Q4	nwbi	Financing Receivable Recorded Accruing Loans Reviewed For Impairment FinancingReceivableRecordedAccruingLoansReviewedForImpairment	44418000	USD
CY2013Q4	nwbi	Financing Receivable Recorded Accruing Troubled Debt Restructuring Not Reviewed For Impairment FinancingReceivableRecordedAccruingTroubledDebtRestructuringNotReviewedForImpairment	22205000	USD
CY2013Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	173844000	USD
CY2013	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	175013000	USD
CY2013	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	5955000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	68347000	USD
CY2012Q4	nwbi	Financing Receivable Recorded Investment Less Than90 Days Past Due FinancingReceivableRecordedInvestmentLessThan90DaysPastDue	51865000	USD
CY2012Q4	nwbi	Financing Receivable Recorded Accruing Loans Reviewed For Impairment FinancingReceivableRecordedAccruingLoansReviewedForImpairment	33282000	USD
CY2012Q4	nwbi	Financing Receivable Recorded Accruing Troubled Debt Restructuring Not Reviewed For Impairment FinancingReceivableRecordedAccruingTroubledDebtRestructuringNotReviewedForImpairment	30817000	USD
CY2012Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	184311000	USD
CY2012	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	190476000	USD
CY2012	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	6524000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Equal To Greater Than90 Days Past Due FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue	95836000	USD
CY2011Q4	nwbi	Financing Receivable Recorded Investment Less Than90 Days Past Due FinancingReceivableRecordedInvestmentLessThan90DaysPastDue	35269000	USD
CY2011Q4	nwbi	Financing Receivable Recorded Accruing Loans Reviewed For Impairment FinancingReceivableRecordedAccruingLoansReviewedForImpairment	22804000	USD
CY2011Q4	nwbi	Financing Receivable Recorded Accruing Troubled Debt Restructuring Not Reviewed For Impairment FinancingReceivableRecordedAccruingTroubledDebtRestructuringNotReviewedForImpairment	25449000	USD
CY2011Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	179358000	USD
CY2011	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	204273000	USD
CY2011	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	6036000	USD
CY2013Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	5691218000	USD
CY2013Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	115073000	USD
CY2013Q4	nwbi	Financing Receivable Individually Evaluated For Impairment Reserved FinancingReceivableIndividuallyEvaluatedForImpairmentReserved	74633000	USD
CY2013Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	11903000	USD
CY2013Q4	nwbi	Financing Receivable Individually Evaluated For Impairment Not Reserved FinancingReceivableIndividuallyEvaluatedForImpairmentNotReserved	40440000	USD
CY2012	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	3440000	USD
CY2012Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	5574501000	USD
CY2012Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	127979000	USD
CY2012Q4	nwbi	Financing Receivable Individually Evaluated For Impairment Reserved FinancingReceivableIndividuallyEvaluatedForImpairmentReserved	103694000	USD
CY2012Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	16607000	USD
CY2012Q4	nwbi	Financing Receivable Individually Evaluated For Impairment Not Reserved FinancingReceivableIndividuallyEvaluatedForImpairmentNotReserved	24285000	USD
CY2011Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	69429000	USD
CY2013	nwbi	Financing Receivable Modifications Recorded Investment Additions FinancingReceivableModificationsRecordedInvestmentAdditions	31111000	USD
CY2012	nwbi	Increase Decrease In Financing Receivable Modifications Recorded Investment Reserve IncreaseDecreaseInFinancingReceivableModificationsRecordedInvestmentReserve	1014000	USD
CY2011	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	44	item
CY2012	nwbi	Financing Receivable Modifications Recorded Investment Additions FinancingReceivableModificationsRecordedInvestmentAdditions	56845000	USD
CY2013	nwbi	Financing Receivable Modifications Recorded Investment Net Paydowns FinancingReceivableModificationsRecordedInvestmentNetPaydowns	25715000	USD
CY2012	nwbi	Financing Receivable Modifications Recorded Investment Net Paydowns FinancingReceivableModificationsRecordedInvestmentNetPaydowns	25205000	USD
CY2013Q4	nwbi	Financing Receivable Modifications Recorded Investment Accrual FinancingReceivableModificationsRecordedInvestmentAccrual	50277000	USD
CY2012Q4	nwbi	Financing Receivable Modifications Recorded Investment Accrual FinancingReceivableModificationsRecordedInvestmentAccrual	48278000	USD
CY2013	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	33	item
CY2013	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	31111000	USD
CY2013	nwbi	Financing Receivable Modification That Subsequently Defaulted Pre Modification Recorded Investment FinancingReceivableModificationThatSubsequentlyDefaultedPreModificationRecordedInvestment	16366000	USD
CY2013	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	24961000	USD
CY2013	nwbi	Financing Receivable Modification Allowance For Credit Losses FinancingReceivableModificationAllowanceForCreditLosses	1111000	USD
CY2013	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	5448000	USD
CY2013	nwbi	Increase Decrease In Financing Receivable Modifications Recorded Investment Reserve IncreaseDecreaseInFinancingReceivableModificationsRecordedInvestmentReserve	908000	USD
CY2012	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	201	item
CY2012	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	56845000	USD
CY2012	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	47244000	USD
CY2012	nwbi	Financing Receivable Modification Allowance For Credit Losses FinancingReceivableModificationAllowanceForCreditLosses	7010000	USD
CY2012	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	20	item
CY2012	nwbi	Financing Receivable Modification That Subsequently Defaulted Pre Modification Recorded Investment FinancingReceivableModificationThatSubsequentlyDefaultedPreModificationRecordedInvestment	4855000	USD
CY2011	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	40184000	USD
CY2011	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	38204000	USD
CY2011	nwbi	Financing Receivable Modification Allowance For Credit Losses FinancingReceivableModificationAllowanceForCreditLosses	2132000	USD
CY2011	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	12	item
CY2011	nwbi	Financing Receivable Modification That Subsequently Defaulted Pre Modification Recorded Investment FinancingReceivableModificationThatSubsequentlyDefaultedPreModificationRecordedInvestment	14480000	USD
CY2011	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	3603000	USD
CY2011	nwbi	Increase Decrease In Financing Receivable Modifications Recorded Investment Reserve IncreaseDecreaseInFinancingReceivableModificationsRecordedInvestmentReserve	793000	USD
CY2013	nwbi	Financing Receivable Modifications Number Of Contracts Remodified FinancingReceivableModificationsNumberOfContractsRemodified	14	item
CY2012	nwbi	Financing Receivable Modifications Number Of Contracts Remodified FinancingReceivableModificationsNumberOfContractsRemodified	12	item
CY2013	nwbi	Financing Receivable Remodifications Post Modification Recorded Investment FinancingReceivableRemodificationsPostModificationRecordedInvestment	11549000	USD
CY2012	nwbi	Financing Receivable Remodifications Post Modification Recorded Investment FinancingReceivableRemodificationsPostModificationRecordedInvestment	8821000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	56639000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment30 To59 Days Past Due FinancingReceivableRecordedInvestment30To59DaysPastDue	61145000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	17200000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment60 To89 Days Past Due FinancingReceivableRecordedInvestment60To89DaysPastDue	27948000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	131596000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	157440000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	5674695000	USD
CY2012Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	5545040000	USD
CY2013Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	634679000	USD
CY2012Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	525780000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2013Q4	us-gaap	Preferred Stock Value PreferredStockValue		USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	5800000	USD
CY2013	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	713000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	937000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	1307450000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	1154904000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2030000	USD
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2131000	USD
CY2013	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	6618000	USD
CY2011	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	172690000	USD
CY2012	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	52028000	USD
CY2013	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	4459000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	7334000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5026000	USD
CY2013	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5718000	USD
CY2011	us-gaap	Dividends Cash DividendsCash	43642000	USD
CY2012	us-gaap	Dividends Cash DividendsCash	56862000	USD
CY2013	us-gaap	Dividends Cash DividendsCash	45871000	USD
CY2013Q4	us-gaap	Trading Securities TradingSecurities	0	USD
CY2012Q4	us-gaap	Trading Securities TradingSecurities	0	USD
CY2013	nwbi	Goodwill Impaired Number Of Valuation Methodologies GoodwillImpairedNumberOfValuationMethodologies	4	item
CY2013	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P7Y
CY2012Q4	nwbi	Fair Value Assets Amount Transfers Between Level1 And Level2 FairValueAssetsAmountTransfersBetweenLevel1AndLevel2	0	USD
CY2012Q4	nwbi	Fair Value Liabilities Amount Transfers Between Level1 And Level2 FairValueLiabilitiesAmountTransfersBetweenLevel1AndLevel2	0	USD
CY2013Q4	us-gaap	Security Owned And Pledged As Collateral Fair Value SecurityOwnedAndPledgedAsCollateralFairValue	695000000	USD
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	331000	USD
CY2013	nwbi	Federal Tax Expense Benefit FederalTaxExpenseBenefit	23276000	USD
CY2012	nwbi	Federal Tax Expense Benefit FederalTaxExpenseBenefit	22484000	USD
CY2011	nwbi	Federal Tax Expense Benefit FederalTaxExpenseBenefit	22623000	USD
CY2012	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	-4089000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0	USD
CY2013	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	-1509000	USD
CY2012	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	-104000	USD
CY2011	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	-104000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	812000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	56000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	56000	USD
CY2013	nwbi	Effective Income Tax Rate Reconciliation Low Income Housing And Historic Tax Credits EffectiveIncomeTaxRateReconciliationLowIncomeHousingAndHistoricTaxCredits	0.016	pure
CY2012	nwbi	Effective Income Tax Rate Reconciliation Low Income Housing And Historic Tax Credits EffectiveIncomeTaxRateReconciliationLowIncomeHousingAndHistoricTaxCredits	0.006	pure
CY2011	nwbi	Effective Income Tax Rate Reconciliation Low Income Housing And Historic Tax Credits EffectiveIncomeTaxRateReconciliationLowIncomeHousingAndHistoricTaxCredits	0.006	pure
CY2013Q4	nwbi	Deferred Tax Assets Available For Sale Securities DeferredTaxAssetsAvailableForSaleSecurities	2079000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	635000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	403000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	610000	USD

Files In Submission

Name	View Source	Status
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$NWBI
Northwest Bancshares, Inc. Stock $nwbi

2013 Q4 Form 10-K Financial Statement

#000110465914014649 Filed on February 28, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWBI Northwest Bancshares, Inc. Stock $nwbi

2013 Q4 Form 10-K Financial Statement

#000110465914014649 Filed on February 28, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWBI
Northwest Bancshares, Inc. Stock $nwbi