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Loans Receivable and Allowance for Loan Losses (Changes in Amortizable Yield) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Loans Receivable and Allowance for Loan Losses [Abstract]
Balance at beginning of period	$ 208
Additions	0
Accretion	(19)
Reclassification and other	0
Balance at end of period	$ 189

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

X

- 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