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Borrowings (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale Securities Pledged as Collateral $ 102,994us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral $ 94,352us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available 276,614us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable  
Advances from Federal Home Loan Banks 22,089us-gaap_AdvancesFromFederalHomeLoanBanks  
FHLB of Pittsburgh [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 143,614us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= nwfl_FhlbOfPittsburghMember
 
Line of Credit Facility, Fair Value of Amount Outstanding 0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= nwfl_FhlbOfPittsburghMember
13,414us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= nwfl_FhlbOfPittsburghMember
Atlantic Central Bankers Bank [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 7,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= nwfl_AtlanticCentralBankersBankMember
 
Line of Credit Facility, Fair Value of Amount Outstanding 0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= nwfl_AtlanticCentralBankersBankMember
0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= nwfl_AtlanticCentralBankersBankMember
PNC Bank [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 16,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= nwfl_PncBankMember
 
Line of Credit Facility, Fair Value of Amount Outstanding 0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= nwfl_PncBankMember
0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= nwfl_PncBankMember
Zion Bank [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 17,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= nwfl_ZionBankMember
 
Line of Credit Facility, Fair Value of Amount Outstanding 0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= nwfl_ZionBankMember
 
Securities Sold under Agreements to Repurchase [Member]    
Available-for-sale Securities Pledged as Collateral 28,914us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
40,065us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Security Owned and Pledged as Collateral, Fair Value $ 28,437us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
$ 38,733us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember