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Fair Value Measurements (Fair Value, by Balance Sheet Grouping) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Financial assets: Cash and due from banks, interest-bearing deposits with banks and federal funds sold, Fair Value Disclosure $ 19,627us-gaap_CashAndCashEquivalentsFairValueDisclosure $ 12,376us-gaap_CashAndCashEquivalentsFairValueDisclosure    
Financial assets: Securities, Fair Value Disclosure 155,674us-gaap_InvestmentsFairValueDisclosure 156,395us-gaap_InvestmentsFairValueDisclosure    
Financial assets: Loans receivable, net, Fair Value Disclosure 524,641us-gaap_LoansReceivableFairValueDisclosure 507,833us-gaap_LoansReceivableFairValueDisclosure    
Financial assets: Mortgage servicing rights, Fair Value Disclosure 265us-gaap_ServicingAssetAtFairValueAmount 277us-gaap_ServicingAssetAtFairValueAmount    
Financial assets: Regulatory stock, Fair Value Disclosure 1,838us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure 1,714us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure    
Financial assets: Bank owned life insurance, Fair Value Disclosure 18,417us-gaap_CashSurrenderValueFairValueDisclosure 18,284us-gaap_CashSurrenderValueFairValueDisclosure    
Financial assets: Accrued interest receivable, Fair Value Disclosure 2,329nwfl_AccruedInterestReceivableFairValueDisclosure 2,339nwfl_AccruedInterestReceivableFairValueDisclosure    
Financial liabilities: Deposits, Fair Value Disclosure 570,470us-gaap_DepositsFairValueDisclosure 560,243us-gaap_DepositsFairValueDisclosure    
Financial liabilities: Short-term borrowings, Fair Value Disclosure 30,581us-gaap_ShorttermDebtFairValue 25,695us-gaap_ShorttermDebtFairValue    
Financial liabilities: Other borrowings, Fair Value Disclosure 28,885us-gaap_LongTermDebtFairValue 23,228us-gaap_LongTermDebtFairValue    
Financial liabilities: Accrued interest payable, Fair Value Disclosure 955nwfl_AccruedInterestPayableFairValueDisclosure 966nwfl_AccruedInterestPayableFairValueDisclosure    
Off-balance sheet financial instruments: Commitments to extend credit and outstanding letters of credit, Fair Value Disclosure 0us-gaap_CommitmentsFairValueDisclosure 0us-gaap_CommitmentsFairValueDisclosure    
Financial assets: Cash and due from banks, interest-bearing deposits with banks and federal funds sold 19,627us-gaap_CashAndCashEquivalentsAtCarryingValue 12,376us-gaap_CashAndCashEquivalentsAtCarryingValue 8,749us-gaap_CashAndCashEquivalentsAtCarryingValue 7,863us-gaap_CashAndCashEquivalentsAtCarryingValue
Financial assets: Securities 155,674us-gaap_MarketableSecurities 156,395us-gaap_MarketableSecurities    
Financial assets: Loans receivable, net 512,954us-gaap_LoansAndLeasesReceivableNetReportedAmount 495,260us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Financial assets: Mortgage servicing rights 265us-gaap_ServicingAsset 271us-gaap_ServicingAsset    
Financial assets: Investment in FHLB stock 1,838us-gaap_FederalHomeLoanBankStock 1,714us-gaap_FederalHomeLoanBankStock    
Financial assets: Bank owned life insurance 18,417us-gaap_BankOwnedLifeInsurance 18,284us-gaap_BankOwnedLifeInsurance    
Financial assets: Accrued interest receivable 2,329us-gaap_InterestReceivable 2,339us-gaap_InterestReceivable    
Financial liabilities: Deposits 570,206us-gaap_Deposits 559,944us-gaap_Deposits    
Financial liabilities: Short-term borrowings 30,581us-gaap_ShortTermBorrowings 25,695us-gaap_ShortTermBorrowings    
Financial liabilities: Other borrowings 27,807us-gaap_FederalHomeLoanBankAdvancesLongTerm 22,200us-gaap_FederalHomeLoanBankAdvancesLongTerm    
Financial liabilities: Accrued interest payable 955us-gaap_InterestPayableCurrentAndNoncurrent 966us-gaap_InterestPayableCurrentAndNoncurrent    
Off-balance sheet financial instruments: Commitments to extend credit and outstanding letters of credit 0us-gaap_OtherCommitment 0us-gaap_OtherCommitment    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Financial assets: Cash and due from banks, interest-bearing deposits with banks and federal funds sold, Fair Value Disclosure 19,627us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
12,376us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial assets: Securities, Fair Value Disclosure 376us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
398us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial assets: Loans receivable, net, Fair Value Disclosure 0us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial assets: Mortgage servicing rights, Fair Value Disclosure 265us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial assets: Regulatory stock, Fair Value Disclosure 1,838us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
1,714us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial assets: Bank owned life insurance, Fair Value Disclosure 18,417us-gaap_CashSurrenderValueFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
18,284us-gaap_CashSurrenderValueFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial assets: Accrued interest receivable, Fair Value Disclosure 2,329nwfl_AccruedInterestReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
2,339nwfl_AccruedInterestReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial liabilities: Deposits, Fair Value Disclosure 348,655us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
338,112us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial liabilities: Short-term borrowings, Fair Value Disclosure 30,581us-gaap_ShorttermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
25,695us-gaap_ShorttermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial liabilities: Other borrowings, Fair Value Disclosure 0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial liabilities: Accrued interest payable, Fair Value Disclosure 955nwfl_AccruedInterestPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
966nwfl_AccruedInterestPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Off-balance sheet financial instruments: Commitments to extend credit and outstanding letters of credit, Fair Value Disclosure 0us-gaap_CommitmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_CommitmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Significant Other Observable Inputs (Level 2) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Financial assets: Cash and due from banks, interest-bearing deposits with banks and federal funds sold, Fair Value Disclosure 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial assets: Securities, Fair Value Disclosure 155,298us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
155,997us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial assets: Loans receivable, net, Fair Value Disclosure 0us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial assets: Mortgage servicing rights, Fair Value Disclosure 0us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
277us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial assets: Regulatory stock, Fair Value Disclosure 0us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial assets: Bank owned life insurance, Fair Value Disclosure 0us-gaap_CashSurrenderValueFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_CashSurrenderValueFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial assets: Accrued interest receivable, Fair Value Disclosure 0nwfl_AccruedInterestReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0nwfl_AccruedInterestReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial liabilities: Deposits, Fair Value Disclosure 0us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial liabilities: Short-term borrowings, Fair Value Disclosure 0us-gaap_ShorttermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_ShorttermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial liabilities: Other borrowings, Fair Value Disclosure 0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial liabilities: Accrued interest payable, Fair Value Disclosure 0nwfl_AccruedInterestPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0nwfl_AccruedInterestPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Off-balance sheet financial instruments: Commitments to extend credit and outstanding letters of credit, Fair Value Disclosure 0us-gaap_CommitmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_CommitmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Significant Unobservable Inputs (Level 3) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Financial assets: Cash and due from banks, interest-bearing deposits with banks and federal funds sold, Fair Value Disclosure 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial assets: Securities, Fair Value Disclosure 0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial assets: Loans receivable, net, Fair Value Disclosure 524,641us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
507,833us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial assets: Mortgage servicing rights, Fair Value Disclosure 0us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial assets: Regulatory stock, Fair Value Disclosure 0us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial assets: Bank owned life insurance, Fair Value Disclosure 0us-gaap_CashSurrenderValueFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_CashSurrenderValueFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial assets: Accrued interest receivable, Fair Value Disclosure 0nwfl_AccruedInterestReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0nwfl_AccruedInterestReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial liabilities: Deposits, Fair Value Disclosure 221,815us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
222,131us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial liabilities: Short-term borrowings, Fair Value Disclosure 0us-gaap_ShorttermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_ShorttermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial liabilities: Other borrowings, Fair Value Disclosure 28,885us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
23,228us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial liabilities: Accrued interest payable, Fair Value Disclosure 0nwfl_AccruedInterestPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0nwfl_AccruedInterestPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Off-balance sheet financial instruments: Commitments to extend credit and outstanding letters of credit, Fair Value Disclosure $ 0us-gaap_CommitmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 0us-gaap_CommitmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member