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 and Dividend Income
Interest and fees on loans	$ 17,777	$ 18,844	$ 21,062
Interest on federal funds sold			12us-gaap_InterestIncomeFederalFundsSold
Interest on deposits in banks	38	61	30
Interest and dividends on securities available for sale:
Taxable interest	2,144us-gaap_InterestIncomeSecuritiesTaxable	1,870us-gaap_InterestIncomeSecuritiesTaxable	1,924us-gaap_InterestIncomeSecuritiesTaxable
Tax-exempt interest	358	307	327
Dividends	82us-gaap_DividendIncomeOperating	75us-gaap_DividendIncomeOperating	77us-gaap_DividendIncomeOperating
Total interest and dividend income	20,399	21,157	23,432
Interest Expense
Interest on deposits	1,442us-gaap_InterestExpenseDeposits	2,368us-gaap_InterestExpenseDeposits	3,707us-gaap_InterestExpenseDeposits
Interest on federal funds purchased	3
Interest on trust preferred capital notes	218	222	238
Interest on other borrowings	115us-gaap_InterestExpenseBorrowings	119us-gaap_InterestExpenseBorrowings	222us-gaap_InterestExpenseBorrowings
Total interest expense	1,778us-gaap_InterestExpense	2,709us-gaap_InterestExpense	4,167us-gaap_InterestExpense
Net interest income	18,621us-gaap_InterestIncomeExpenseNet	18,448us-gaap_InterestIncomeExpenseNet	19,265us-gaap_InterestIncomeExpenseNet
Provision for (recovery of) loan losses	(3,850)us-gaap_ProvisionForLoanAndLeaseLosses	(425)us-gaap_ProvisionForLoanAndLeaseLosses	3,555us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for (recovery of) loan losses	22,471	18,873	15,710
Noninterest Income
Service charges on deposit accounts	2,572	2,204	2,127
ATM and check card fees	1,419fxnc_AtmAndCheckCardFees	1,425fxnc_AtmAndCheckCardFees	1,481fxnc_AtmAndCheckCardFees
Wealth management fees	1,915us-gaap_FeesAndCommissions	1,696us-gaap_FeesAndCommissions	1,450us-gaap_FeesAndCommissions
Fees for other customer services	397us-gaap_FeesAndCommissionsOther	391us-gaap_FeesAndCommissionsOther	390us-gaap_FeesAndCommissionsOther
Income from bank owned life insurance	367us-gaap_BankOwnedLifeInsuranceIncome	358us-gaap_BankOwnedLifeInsuranceIncome	14us-gaap_BankOwnedLifeInsuranceIncome
Net gains on sale of securities available for sale	696us-gaap_GainLossOnSaleOfSecuritiesNet		1,285us-gaap_GainLossOnSaleOfSecuritiesNet
Net gains on sale of loans	20us-gaap_GainLossOnSalesOfLoansNet	193us-gaap_GainLossOnSalesOfLoansNet	214us-gaap_GainLossOnSalesOfLoansNet
Gain on termination of postretirement benefit		543
Other operating income	58	121	211
Total noninterest income	7,444us-gaap_NoninterestIncome	6,931us-gaap_NoninterestIncome	7,172us-gaap_NoninterestIncome
Noninterest Expense
Salaries and employee benefits	10,586us-gaap_LaborAndRelatedExpense	10,528us-gaap_LaborAndRelatedExpense	9,590us-gaap_LaborAndRelatedExpense
Occupancy	1,211us-gaap_OccupancyNet	1,282us-gaap_OccupancyNet	1,343us-gaap_OccupancyNet
Equipment	1,191us-gaap_EquipmentExpense	1,208us-gaap_EquipmentExpense	1,208us-gaap_EquipmentExpense
Marketing	426us-gaap_MarketingExpense	345us-gaap_MarketingExpense	430us-gaap_MarketingExpense
Stationery and supplies	333us-gaap_SuppliesExpense	288us-gaap_SuppliesExpense	308us-gaap_SuppliesExpense
Legal and professional fees	1,019us-gaap_ProfessionalFees	975us-gaap_ProfessionalFees	975us-gaap_ProfessionalFees
ATM and check card fees	661fxnc_AtmAndCheckCardFeesExpenses	668fxnc_AtmAndCheckCardFeesExpenses	649fxnc_AtmAndCheckCardFeesExpenses
FDIC assessment	454	884	709
Bank franchise tax	410fxnc_BankFranchiseTax	279fxnc_BankFranchiseTax	260fxnc_BankFranchiseTax
Telecommunications expense	300us-gaap_Communication	283us-gaap_Communication	245us-gaap_Communication
Data processing expense	518	376	347
Other real estate owned (income) expense, net	(213)	1,115	1,355
Net (gain) loss on disposal of premises and equipment	2us-gaap_GainLossOnDispositionOfAssets	601us-gaap_GainLossOnDispositionOfAssets	(2)us-gaap_GainLossOnDispositionOfAssets
Loss on lease termination		263us-gaap_GainLossOnContractTermination
Other operating expense	1,887us-gaap_OtherNoninterestExpense	1,655us-gaap_OtherNoninterestExpense	1,700us-gaap_OtherNoninterestExpense
Total noninterest expense	18,785us-gaap_NoninterestExpense	20,750us-gaap_NoninterestExpense	19,117us-gaap_NoninterestExpense
Income before income taxes	11,130	5,054	3,765
Income tax provision (benefit)	3,499us-gaap_IncomeTaxExpenseBenefit	(4,820)us-gaap_IncomeTaxExpenseBenefit	965us-gaap_IncomeTaxExpenseBenefit
Net income	7,631us-gaap_NetIncomeLoss	9,874us-gaap_NetIncomeLoss	2,800us-gaap_NetIncomeLoss
Effective dividend and accretion on preferred stock	1,138	913	904
Net income available to common shareholders	$ 6,493	$ 8,961	$ 1,896
Earnings per common share, basic and diluted	$ 1.32us-gaap_EarningsPerShareBasicAndDiluted	$ 1.83us-gaap_EarningsPerShareBasicAndDiluted	$ 0.48us-gaap_EarningsPerShareBasicAndDiluted

ATM and check card fees.

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ATM and check card fees.

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Bank franchise tax.

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Gain loss on postretirement benefit liability.

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Other Real Estate Owned Income (Expense), Net

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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The amount of expense incurred in the period for communication, which is the exchange of information by several methods.

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Amount of operating dividend income on securities.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

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Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.

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Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions.

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Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.

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Fee and commission revenue earned from sources not otherwise specified in the existing taxonomy.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of expenses incurred in the period for information technology and data processing products and services.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Aggregate amount of interest expense on all borrowings.

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Aggregate amount of interest expense on all deposits.

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Gross expenses on the purchase of Federal funds at a specified price with a simultaneous agreement to sell the same to the same counterparty at a fixed or determinable price at a future date.

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The amount of interest incurred to a trust which has issued trust-preferred securities. In order to issue trust preferred securities, a sponsor forms a trust by investing a nominal amount of cash to purchase all of the voting common stock of the trust. The trust issues nonvoting, mandatorily redeemable preferred securities to outside investors in exchange for cash. The proceeds received from the issuance of the preferred securities, together with the cash received for issuing the common stock to the sponsor, is then loaned to the sponsor in exchange for a note which has the same terms as the trust preferred securities. Trust preferred securities possesses characteristics of both equity and debt issues and are generally issued by bank holding companies.

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Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.

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The net amount of operating interest income (expense).

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Interest income on federal funds sold. Federal funds sold represent the excess federal funds held by one commercial bank which it lends to another commercial bank, usually at an agreed-upon (federal funds) rate of interest. Such loans generally are of short-duration (overnight).

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax.

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Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Total aggregate amount of all noninterest expense.

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Represents other forms of revenue earned, excluding interest, which is not otherwise specified in the taxonomy.

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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

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The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Amount of expense related to estimated loss from loan and lease transactions.

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Amount of expense associated with supplies that were used during the current accounting period.

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