Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
INTEREST INCOME
Loans receivable, including fees	$ 23,841	$ 24,576	$ 25,494
Securities: Taxable	2,032us-gaap_InterestIncomeSecuritiesTaxable	1,662us-gaap_InterestIncomeSecuritiesTaxable	1,950us-gaap_InterestIncomeSecuritiesTaxable
Securities: Tax exempt	1,888	1,995	1,938
Other	7us-gaap_OtherInterestAndDividendIncome	26us-gaap_OtherInterestAndDividendIncome	32us-gaap_OtherInterestAndDividendIncome
Total interest income	27,768	28,259	29,414
INTEREST EXPENSE
Deposits	2,463us-gaap_InterestExpenseDomesticDeposits	2,848us-gaap_InterestExpenseDomesticDeposits	3,660us-gaap_InterestExpenseDomesticDeposits
Short-term borrowings	77	66	53
Other borrowings	668	684	937
Total Interest Expense	3,208us-gaap_InterestExpense	3,598us-gaap_InterestExpense	4,650us-gaap_InterestExpense
Net Interest Income	24,560us-gaap_InterestIncomeExpenseNet	24,661us-gaap_InterestIncomeExpenseNet	24,764us-gaap_InterestIncomeExpenseNet
PROVISION FOR LOAN LOSSES	1,680us-gaap_ProvisionForLoanAndLeaseLosses	2,400us-gaap_ProvisionForLoanAndLeaseLosses	2,450us-gaap_ProvisionForLoanAndLeaseLosses
Net Interest Income after Provision for Loan Losses	22,880	22,261	22,314
OTHER INCOME
Service charges and fees	2,350	2,412	2,237
Income from fiduciary activities	437	379	355
Net realized gains on sales of securities	1,170us-gaap_GainLossOnSaleOfSecuritiesNet	881us-gaap_GainLossOnSaleOfSecuritiesNet	1,419us-gaap_GainLossOnSaleOfSecuritiesNet
Gains on sale of loans and servicing rights	132us-gaap_GainLossOnSalesOfLoansNet	112us-gaap_GainLossOnSalesOfLoansNet	211us-gaap_GainLossOnSalesOfLoansNet
Earnings and proceeds on bank owned life insurance	685us-gaap_BankOwnedLifeInsuranceIncome	1,386us-gaap_BankOwnedLifeInsuranceIncome	539us-gaap_BankOwnedLifeInsuranceIncome
Other	336	445	445
Total other income	5,110us-gaap_NoninterestIncome	5,615us-gaap_NoninterestIncome	5,206us-gaap_NoninterestIncome
OTHER EXPENSES
Salaries and employee benefits	8,616us-gaap_LaborAndRelatedExpense	8,447us-gaap_LaborAndRelatedExpense	8,403us-gaap_LaborAndRelatedExpense
Occupancy	1,676us-gaap_OccupancyNet	1,598us-gaap_OccupancyNet	1,539us-gaap_OccupancyNet
Furniture and equipment	441us-gaap_EquipmentExpense	538us-gaap_EquipmentExpense	456us-gaap_EquipmentExpense
Data processing related operations	929	891	897
Federal Deposit Insurance Corporation insurance assessment	420	444	398
Advertising	224us-gaap_AdvertisingExpense	208us-gaap_AdvertisingExpense	222us-gaap_AdvertisingExpense
Professional fees	671us-gaap_ProfessionalFees	626us-gaap_ProfessionalFees	811us-gaap_ProfessionalFees
Postage and telephone	414nwfl_PostageAndTelephoneExpense	435nwfl_PostageAndTelephoneExpense	424nwfl_PostageAndTelephoneExpense
Taxes, other than income	649	710	599
Foreclosed real estate owned	1,555us-gaap_ForeclosedRealEstateExpense	567us-gaap_ForeclosedRealEstateExpense	217us-gaap_ForeclosedRealEstateExpense
Amortization of Intangible Assets	121us-gaap_AmortizationOfIntangibleAssets	137us-gaap_AmortizationOfIntangibleAssets	153us-gaap_AmortizationOfIntangibleAssets
Other	2,011us-gaap_OtherNoninterestExpense	2,104us-gaap_OtherNoninterestExpense	1,962us-gaap_OtherNoninterestExpense
Total other expenses	17,727us-gaap_NoninterestExpense	16,705us-gaap_NoninterestExpense	16,081us-gaap_NoninterestExpense
Income before Income Taxes	10,263	11,171	11,439
INCOME TAX EXPENSE	2,606us-gaap_IncomeTaxExpenseBenefit	2,706us-gaap_IncomeTaxExpenseBenefit	3,036us-gaap_IncomeTaxExpenseBenefit
Net Income	$ 7,657us-gaap_NetIncomeLoss	$ 8,465us-gaap_NetIncomeLoss	$ 8,403us-gaap_NetIncomeLoss
EARNINGS PER SHARE
BASIC EARNINGS PER SHARE	$ 2.10us-gaap_EarningsPerShareBasic	$ 2.33us-gaap_EarningsPerShareBasic	$ 2.33us-gaap_EarningsPerShareBasic
DILUTED EARNINGS PER SHARE	$ 2.10us-gaap_EarningsPerShareDiluted	$ 2.33us-gaap_EarningsPerShareDiluted	$ 2.33us-gaap_EarningsPerShareDiluted

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Amount of expense recognized during the period for the foreclosure on real estate assets.

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