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Summary of Significant Accounting Policies (Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Net (Excluding Goodwill) $ 389us-gaap_IntangibleAssetsNetExcludingGoodwill $ 510us-gaap_IntangibleAssetsNetExcludingGoodwill  
Finite-Lived Intangible Asset, Useful Life 10 years    
Amortization of Intangible Assets 121us-gaap_AmortizationOfIntangibleAssets 137us-gaap_AmortizationOfIntangibleAssets 153us-gaap_AmortizationOfIntangibleAssets
Amortization Expense for the Core Deposit Intangible, Next Twelve Months 104us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Amortization Expense for the Core Deposit Intangible, Year Two 88us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Amortization Expense for the Core Deposit Intangible, Year Three 72us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Amortization Expense for the Core Deposit Intangible, Year Four 56us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Amortization Expense for the Core Deposit Intangible, Year Five 39us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Amortization Expense for the Core Deposit Intangible, Year Six 23nwfl_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix    
Amortization Expense for the Core Deposit Intangible, Year Seven 7nwfl_FiniteLivedIntangibleAssetsAmortizationExpenseYearSeven    
Amortization Expense for the Core Deposit Intangible, Total 389us-gaap_FiniteLivedIntangibleAssetsNet    
North Penn Bancorp, Inc. [Member]      
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Net (Excluding Goodwill) 389us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= nwfl_NorthPennBancorpIncMember		 510us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= nwfl_NorthPennBancorpIncMember		  
Finite-Lived Intangible Assets, Accumulated Amortization $ 506us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_BusinessAcquisitionAxis
= nwfl_NorthPennBancorpIncMember		 $ 385us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_BusinessAcquisitionAxis
= nwfl_NorthPennBancorpIncMember