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Loans Receivable and Allowance for Loan Losses (Troubled Debt Restructurings) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Impaired Financing Receivable, Related Allowance $ 284,000us-gaap_ImpairedFinancingReceivableRelatedAllowance   $ 293,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
Financing Receivable, Allowance for Credit Losses, Write-downs 495,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs 415,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs  
Troubled Debt Restructured Loans [Member]      
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]      
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwfl_TroubledDebtRestructuredLoansMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwfl_TroubledDebtRestructuredLoansMember
 
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 2,400,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwfl_TroubledDebtRestructuredLoansMember
   
New Loans Identified as Troubled Debt Restructurings, Number of Loans 0nwfl_NewLoansIdentifiedAsTroubledDebtRestructuringsNumberOfLoans
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwfl_TroubledDebtRestructuredLoansMember
0nwfl_NewLoansIdentifiedAsTroubledDebtRestructuringsNumberOfLoans
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwfl_TroubledDebtRestructuredLoansMember
 
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 373,000us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwfl_TroubledDebtRestructuredLoansMember
   
Financing Receivable, Modifications, Recorded Investment 8,600,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwfl_TroubledDebtRestructuredLoansMember
  8,800,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwfl_TroubledDebtRestructuredLoansMember
Impaired Financing Receivable, Related Allowance $ 33,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwfl_TroubledDebtRestructuredLoansMember
  $ 293,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwfl_TroubledDebtRestructuredLoansMember