CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 83,970us-gaap_CashAndDueFromBanks	$ 87,401us-gaap_CashAndDueFromBanks
Interest-earning deposits in other financial institutions	212,496us-gaap_InterestBearingDepositsInBanks	152,671us-gaap_InterestBearingDepositsInBanks
Federal funds sold and other short-term investments	635	634
Marketable securities available-for-sale (amortized cost of $906,028 and $906,702)	916,423us-gaap_AvailableForSaleSecurities	912,371us-gaap_AvailableForSaleSecurities
Marketable securities held-to-maturity (fair value of $92,989 and $106,292)	90,825us-gaap_HeldToMaturitySecurities	103,695us-gaap_HeldToMaturitySecurities
Total cash and investments	1,304,349	1,256,772
Personal Banking:
Residential mortgage loans	2,543,870	2,521,456
Home equity loans	1,055,739	1,066,131
Other consumer loans	239,956	242,744
Total Personal Banking	3,839,565	3,830,331
Business Banking:
Commercial real estate loans	1,856,574	1,801,184
Commercial loans	368,725	358,376
Total Business Banking	2,225,299	2,159,560
Total loans	6,064,864	5,989,891
Allowance for loan losses	(67,298)	(67,518)
Total loans, net	5,997,566us-gaap_LoansReceivableNet	5,922,373us-gaap_LoansReceivableNet
Federal Home Loan Bank stock, at cost	36,292us-gaap_FederalHomeLoanBankStock	33,293us-gaap_FederalHomeLoanBankStock
Accrued interest receivable	19,753us-gaap_InterestReceivable	18,623us-gaap_InterestReceivable
Real estate owned, net	15,346	16,759
Premises and equipment, net	142,481us-gaap_PropertyPlantAndEquipmentNet	143,909us-gaap_PropertyPlantAndEquipmentNet
Bank owned life insurance	145,275us-gaap_BankOwnedLifeInsurance	144,362us-gaap_BankOwnedLifeInsurance
Goodwill	175,498us-gaap_Goodwill	175,323us-gaap_Goodwill
Other intangible assets	3,027	3,033
Other assets	50,772us-gaap_OtherAssets	60,586us-gaap_OtherAssets
Total assets	7,890,359us-gaap_Assets	7,775,033us-gaap_Assets
Liabilities:
Noninterest-bearing checking deposits	944,937	891,248
Interest-bearing checking deposits	898,945	874,623
Money market deposit accounts	1,151,971us-gaap_DepositsMoneyMarketDeposits	1,179,070us-gaap_DepositsMoneyMarketDeposits
Savings deposits	1,257,446us-gaap_DepositsSavingsDeposits	1,209,287us-gaap_DepositsSavingsDeposits
Time deposits	1,428,768us-gaap_TimeDeposits	1,478,314us-gaap_TimeDeposits
Total deposits	5,682,067us-gaap_Deposits	5,632,542us-gaap_Deposits
Borrowed funds	943,842us-gaap_BorrowedFunds	888,109us-gaap_BorrowedFunds
Junior subordinated deferrable interest debentures held by trusts that issued guaranteed capital debt securities	103,094	103,094
Advances by borrowers for taxes and insurance	34,998	30,507
Accrued interest payable	1,336	936
Other liabilities	57,506us-gaap_OtherLiabilities	57,198us-gaap_OtherLiabilities
Total liabilities	6,822,843us-gaap_Liabilities	6,712,386us-gaap_Liabilities
Shareholders' equity:
Preferred stock, $0.01 par value: 50,000,000 authorized, no shares issued
Common stock, $0.01 par value: 500,000,000 shares authorized, 94,553,350 and 94,721,453 shares issued, respectively	946us-gaap_CommonStockValue	947us-gaap_CommonStockValue
Paid-in capital	624,584	626,134
Retained earnings	484,774	481,577
Unallocated common stock of Employee Stock Ownership Plan	(21,565)nwbi_UnallocatedCommonStockHeldByESOP	(21,641)nwbi_UnallocatedCommonStockHeldByESOP
Accumulated other comprehensive loss	(21,223)	(24,370)
Total shareholders' equity	1,067,516us-gaap_StockholdersEquity	1,062,647us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	$ 7,890,359	$ 7,775,033

Cash, cash equivalents and marketable securities.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Amount of noninterest-bearing domestic checking deposit liabilities.

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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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