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Regulatory Matters - Comparison of Capital of Company and Bank with Minimum Regulatory Guidelines (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Actual Amount Total Capital (to Risk Weighted Assets)	$ 75,045us-gaap_Capital	$ 66,437us-gaap_Capital
Actual Ratio Total Capital (to Risk Weighted Assets)	19.93%us-gaap_CapitalToRiskWeightedAssets	18.21%us-gaap_CapitalToRiskWeightedAssets
Minimum Capital Requirement Amount Total Capital (to Risk Weighted Assets)	30,130us-gaap_CapitalRequiredForCapitalAdequacy	29,193us-gaap_CapitalRequiredForCapitalAdequacy
Minimum Capital Requirement Ratio Total Capital (to Risk Weighted Assets)	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Total Capital (to Risk Weighted Assets)	0us-gaap_CapitalRequiredToBeWellCapitalized	0us-gaap_CapitalRequiredToBeWellCapitalized
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Total Capital (to Risk Weighted Assets)	0.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Actual Amount Tier 1 Capital (to Risk Weighted Assets)	70,312us-gaap_TierOneRiskBasedCapital	61,800us-gaap_TierOneRiskBasedCapital
Actual Ratio Tier 1 Capital (to Risk Weighted Assets)	18.67%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets	16.94%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Minimum Capital Requirement Amount Tier 1 Capital (to Risk Weighted Assets)	15,065us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy	14,597us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Minimum Capital Requirement Ratio Tier 1 Capital (to Risk Weighted Assets)	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Tier 1 Capital (to Risk Weighted Assets)	0us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized	0us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Tier 1 Capital (to Risk Weighted Assets)	0.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Actual Amount Tier 1 Capital (to Average Assets)	70,312us-gaap_TierOneLeverageCapital	61,800us-gaap_TierOneLeverageCapital
Actual Ratio Tier 1 Capital (to Average Assets)	13.47%us-gaap_TierOneLeverageCapitalToAverageAssets	11.75%us-gaap_TierOneLeverageCapitalToAverageAssets
Minimum Capital Requirement Amount Tier 1 Capital (to Average Assets)	20,872us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy	21,047us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Minimum Capital Requirement Ratio Tier 1 Capital (to Average Assets)	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Tier 1 Capital (to Average Assets)	0us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized	0us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Tier 1 Capital (to Average Assets)	0.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
First Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Actual Amount Total Capital (to Risk Weighted Assets)	71,941us-gaap_Capital / dei_LegalEntityAxis = fxnc_FirstBankMember	60,578us-gaap_Capital / dei_LegalEntityAxis = fxnc_FirstBankMember
Actual Ratio Total Capital (to Risk Weighted Assets)	19.14%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember	16.62%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum Capital Requirement Amount Total Capital (to Risk Weighted Assets)	30,077us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fxnc_FirstBankMember	29,160us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum Capital Requirement Ratio Total Capital (to Risk Weighted Assets)	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Total Capital (to Risk Weighted Assets)	37,596us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fxnc_FirstBankMember	36,450us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Total Capital (to Risk Weighted Assets)	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember
Actual Amount Tier 1 Capital (to Risk Weighted Assets)	67,217us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fxnc_FirstBankMember	55,947us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fxnc_FirstBankMember
Actual Ratio Tier 1 Capital (to Risk Weighted Assets)	17.88%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember	15.35%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum Capital Requirement Amount Tier 1 Capital (to Risk Weighted Assets)	15,038us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fxnc_FirstBankMember	14,580us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum Capital Requirement Ratio Tier 1 Capital (to Risk Weighted Assets)	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Tier 1 Capital (to Risk Weighted Assets)	22,557us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fxnc_FirstBankMember	21,870us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Tier 1 Capital (to Risk Weighted Assets)	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fxnc_FirstBankMember
Actual Amount Tier 1 Capital (to Average Assets)	67,217us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fxnc_FirstBankMember	55,947us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fxnc_FirstBankMember
Actual Ratio Tier 1 Capital (to Average Assets)	12.90%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fxnc_FirstBankMember	10.68%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum Capital Requirement Amount Tier 1 Capital (to Average Assets)	20,841us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fxnc_FirstBankMember	20,948us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum Capital Requirement Ratio Tier 1 Capital (to Average Assets)	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fxnc_FirstBankMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Tier 1 Capital (to Average Assets)	$ 26,051us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fxnc_FirstBankMember	$ 26,184us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fxnc_FirstBankMember
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Tier 1 Capital (to Average Assets)	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fxnc_FirstBankMember	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fxnc_FirstBankMember

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The amount of total capital as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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