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Loans Receivable and Allowance for Loan Losses (Changes in Amortizable Yield) (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 USD ($)
Loans Receivable and Allowance for Loan Losses [Abstract] |
Balance at beginning of period | $ 208
Additions | 0
Accretion | (37)
Reclassification and other | 0
Balance at end of period | $ 171

X
- Definition Accretion of amortizable yield of acquired impaired loans. + References No definition available. + Details
Name: | nwfl_AccretionOfAmortizableYieldOfAcquiredImpairedLoans
Namespace Prefix: | nwfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Additions to amortizable yield for acquired impaired loans. + References No definition available. + Details
Name: | nwfl_AdditionsToAmortizableYieldForAcquiredImpairedLoans
Namespace Prefix: | nwfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortizable yield of acquired impaired loans. + References No definition available. + Details
Name: | nwfl_AmortizableYieldOfAcquiredImpairedLoans
Namespace Prefix: | nwfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reclassification and other adjustments to amortizable yield of acquired impaired loans + References No definition available. + Details
Name: | nwfl_ReclassificationAndOtherAdjustmentsToAmortizableYieldOfAcquiredImpairedLoans
Namespace Prefix: | nwfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration