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Capital Requirements - Comparison of Capital of Bank with Minimum Regulatory Guidelines (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Regulatory Capital Requirements [Abstract] |  |
Actual Amount Total Capital (to Risk Weighted Assets) | $ 72,764 us-gaap_Capital | $ 71,941 us-gaap_Capital
Actual Ratio Total Capital (to Risk Weighted Assets) | 18.86%us-gaap_CapitalToRiskWeightedAssets | 19.14%us-gaap_CapitalToRiskWeightedAssets
Minimum Capital Requirement Amount Total Capital (to Risk Weighted Assets) | 30,859 us-gaap_CapitalRequiredForCapitalAdequacy | 30,077 us-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) | 38,573 us-gaap_CapitalRequiredToBeWellCapitalized | 37,596 us-gaap_CapitalRequiredToBeWellCapitalized
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Total Capital (to Risk Weighted Assets) | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Actual Amount Tier 1 Capital (to Risk Weighted Assets) | 67,918 us-gaap_TierOneRiskBasedCapital | 67,217 us-gaap_TierOneRiskBasedCapital
Actual Ratio Tier 1 Capital (to Risk Weighted Assets) | 17.61%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets | 17.88%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Minimum Capital Requirement Amount Tier 1 Capital (to Risk Weighted Assets) | 23,144 us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy | 15,038 us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Minimum Capital Requirement Ratio Tier 1 Capital (to Risk Weighted Assets) | 6.00%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) | 30,859 us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized | 22,557 us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Tier 1 Capital (to Risk Weighted Assets) | 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Actual Amount Common Equity Tier 1 Capital (to Risk Weighted Assets) | 67,918 fxnc_CommonEquityTierOneRiskBasedCapital |
Actual Ratio Common Equity Tier 1 Capital (to Risk Weighted Assets) | 17.61%fxnc_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets |
Minimum Capital Requirement Amount Common Equity Tier 1 Capital (to Risk Weighted Assets) | 17,358 fxnc_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy |
Minimum Capital Requirement Ratio Common Equity Tier 1 Capital (to Risk Weighted Assets) | 4.50%fxnc_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets |
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Common Equity Tier 1 Capital (to Risk Weighted Assets) | 25,073 fxnc_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized |
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Common Equity Tier 1 Capital (to Risk Weighted Assets) | 6.50%fxnc_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets |
Actual Amount Tier 1 Capital (to Average Assets) | 67,918 us-gaap_TierOneLeverageCapital | 67,217 us-gaap_TierOneLeverageCapital
Actual Ratio Tier 1 Capital (to Average Assets) | 13.17%us-gaap_TierOneLeverageCapitalToAverageAssets | 12.90%us-gaap_TierOneLeverageCapitalToAverageAssets
Minimum Capital Requirement Amount Tier 1 Capital (to Average Assets) | 20,628 us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy | 20,841 us-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) | $ 25,785 us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized | $ 26,051 us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Tier 1 Capital (to Average Assets) | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets

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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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- Definition The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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