XML 122 R88.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Benefit Plans (Details Textual) (USD $) | 1 Months Ended | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2000 | Dec. 31, 2012 Age Hour | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Defined Benefit Postretirement Life Insurance [Member] | Dec. 31, 2011 Defined Benefit Postretirement Life Insurance [Member] | Dec. 31, 2010 Defined Benefit Postretirement Life Insurance [Member] | Apr. 26, 2010 Employee Stock Ownership Plan ESOP Plan [Member] | Dec. 31, 2012 Pension Plans, Defined Benefit [Member] Age | Dec. 31, 2011 Pension Plans, Defined Benefit [Member] | Dec. 31, 2010 Pension Plans, Defined Benefit [Member] | Dec. 31, 2012 Pension Plans, Defined Benefit [Member] Fixed income funds [Member] | Dec. 31, 2012 Pension Plans, Defined Benefit [Member] Equity funds [Member]
Benefit Plans (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum eligibility for full-time employees, age |  |  |  |  |  |  |  |  |  |  | 21 |  |  |  |
Period of service credit by employee |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Effective discount rate |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |
Targeted asset allocation on fixed income |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% | 75.00%
Amount contributed to pension plan, Expected in future |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |
Amount contributed to pension plan |  | 306,000 | 240,000 |  |  |  |  |  |  |  | 306,000 | 240,000 | 200,000 |  |
Amount of accumulated benefit obligation for the defined benefit pension plan |  |  |  |  |  |  |  |  |  |  | 5,100,000 | 4,200,000 |  |  |
Percentage of employee for which company makes specified contribution |  |  |  |  | 6.00% | 2.00% |  |  |  |  |  |  |  |  |
Company loaned the ESOP |  |  |  |  |  |  |  |  |  | 570,000 |  |  |  |  |
Related effect on net income recognized expense |  |  |  |  |  |  | 21,000 | 104,000 | 36,000 |  |  |  |  |  |
Benefit Plans (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of first employee compensation for which company makes matching contribution |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Company contribution on employee specific contribution |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Number of hours in service required for the contribution to be allocated |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum eligibility for employees under 401(k) Plan, age |  | 19 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plan service years after which employer matching contribution vest |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |
Expense attributable to the Plan amounted |  | 219,000 | 200,000 | 164,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of vested participants | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Participants years of credited service | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense for ESOP |  | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |
Shares of the Company held by the ESOP |  | 134,609 | 65,633 | 53,167 |  |  |  |  |  |  |  |  |  |  |

X
- Definition Amount of debt incurred by pledging stock. + References No definition available. + Details
Name: | fxnc_AmountOfDebtIncurredByPledgingStock
Namespace Prefix: | fxnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | fxnc_BenefitPlansAdditionalTextualAbstract
Namespace Prefix: | fxnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | fxnc_BenefitPlansTextualAbstract
Namespace Prefix: | fxnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined benefit pension plan minimum eligible age of employee. + References No definition available. + Details
Name: | fxnc_DefinedBenefitPensionPlanMinimumEligibleAgeOfEmployee
Namespace Prefix: | fxnc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined benefit plan single effective discount rate. + References No definition available. + Details
Name: | fxnc_DefinedBenefitPlanSingleEffectiveDiscountRate
Namespace Prefix: | fxnc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined contribution plan minimum eligible age of employee. + References No definition available. + Details
Name: | fxnc_DefinedContributionPlanMinimumEligibleAgeOfEmployee
Namespace Prefix: | fxnc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined contribution plan percentage of employer matching contribution of first one percent of employee contribution. + References No definition available. + Details
Name: | fxnc_DefinedContributionPlanPercentageOfEmployerMatchingContributionOfFirstOnePercentOfEmployeeContribution
Namespace Prefix: | fxnc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined contribution plan percentage of employer matching contribution of stated percentage of employee contribution. + References No definition available. + Details
Name: | fxnc_DefinedContributionPlanPercentageOfEmployerMatchingContributionOfStatedPercentageOfEmployeeContribution
Namespace Prefix: | fxnc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined contribution plan stated percentage of employees contribution. + References No definition available. + Details
Name: | fxnc_DefinedContributionPlanStatedPercentageOfEmployeesContribution
Namespace Prefix: | fxnc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employee matching contribution vesting period under plan. + References No definition available. + Details
Name: | fxnc_EmployeeMatchingContributionVestingPeriodUnderPlan
Namespace Prefix: | fxnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expense benefit recognized under plan. + References No definition available. + Details
Name: | fxnc_ExpenseBenefitRecognizedUnderPlan
Namespace Prefix: | fxnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period of service credit by employee. + References No definition available. + Details
Name: | fxnc_PeriodOfServiceCreditByEmployee
Namespace Prefix: | fxnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Services completed by eligible participant under plan. + References No definition available. + Details
Name: | fxnc_ServicesCompletedByEligibleParticipantUnderPlan
Namespace Prefix: | fxnc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award vesting percentage under award requisite service period. + References No definition available. + Details
Name: | fxnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUnderAwardRequisiteServicePeriod
Namespace Prefix: | fxnc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
Name: | us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration