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Deposits (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Time Deposit Maturities, Next Twelve Months $ 108,498us-gaap_TimeDepositMaturitiesYearOne  
Time Deposit Maturities, Year Two 51,951us-gaap_TimeDepositMaturitiesYearTwo  
Time Deposit Maturities, Year Three 31,360us-gaap_TimeDepositMaturitiesYearThree  
Time Deposit Maturities, Year Four 20,529us-gaap_TimeDepositMaturitiesYearFour  
Time Deposit Maturities, Year Five 9,494us-gaap_TimeDepositMaturitiesYearFive  
Time Deposits, Total 221,832us-gaap_TimeDeposits 211,429us-gaap_TimeDeposits
Time Deposits, $250,000 or More 42,009nwfl_TimeDeposits250000OrMore 27,704nwfl_TimeDeposits250000OrMore
Deposits, total 559,944us-gaap_Deposits 541,182us-gaap_Deposits
Major Customer Deposits [Member]    
Deposits, total $ 31,979us-gaap_Deposits
/ us-gaap_MajorCustomersAxis
= nwfl_MajorCustomerDepositsMember