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

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- Definition The number of new loans identified as troubled debt restructurings during the period. + References No definition available. + Details
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Namespace Prefix: | nwfl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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Period Type: | instant

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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- Details
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- Details
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