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Loans Receivable and Allowance for Loan Losses (Classes of the Loan Portfolio Summarized by the Aggregate Risk Rating) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | $ 299,597 | $ 285,160
Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 275,911 | 259,005
Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 11,563 | 11,436
Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 12,123 | 14,719
Performing Financing Receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 174,786 | 170,082
Nonperforming Financing Receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 2,846 | 3,087
Commercial Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 274,484 | 262,476
Commercial Real Estate Loans [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 251,484 | 237,407
Commercial Real Estate Loans [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 11,245 | 11,009
Commercial Real Estate Loans [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 11,755 | 14,060
Commercial Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 25,113 | 22,684
Commercial Loans [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 24,427 | 21,598
Commercial Loans [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 318 | 427
Commercial Loans [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 368 | 659
Residential Real Estate Loans [Member] | Performing Financing Receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 147,197 | 145,061
Residential Real Estate Loans [Member] | Nonperforming Financing Receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 2,846 | 3,087
Construction Real Estate Loans [Member] | Performing Financing Receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | 13,435 | 11,087
Consumer Loans [Member] | Performing Financing Receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Subject to the Internal Risk Rating System | $ 14,154 | $ 13,934

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- Definition Loans Receivable, Subject to the Internal Risk Rating System + References No definition available. + Details
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Namespace Prefix: | nwfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration