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Note 2 - Securities - Investments in an Unrealized Loss Position That Were Temporarily Impaired (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Less than 12 months, fair value, available for sale securities | $ 90,024,000 | $ 18,387,000
Less than 12 months, unrealized (loss), available for sale securities | (1,004,000) | (82,000)
12 months or more, fair value, available for sale securities | 0 | 0
12 months or more, unrealized (loss), available for sale securities | 0 | 0
Total, fair value, available for sale securities | 90,024,000 | 18,387,000
Total, unrealized (loss), available for sale securities | (1,004,000) | (82,000)
US Treasury Securities [Member] |  |
Less than 12 months, fair value, available for sale securities | 9,938,000 |
Less than 12 months, unrealized (loss), available for sale securities | (32,000) |
12 months or more, fair value, available for sale securities | 0 |
12 months or more, unrealized (loss), available for sale securities | 0 |
Total, fair value, available for sale securities | 9,938 |
Total, unrealized (loss), available for sale securities | (32,000) |
US Agency and Mortgage-backed Securities [Member] |  |
Less than 12 months, fair value, available for sale securities | 59,563,000 | 17,367,000
Less than 12 months, unrealized (loss), available for sale securities | (739,000) | (80,000)
12 months or more, fair value, available for sale securities | 0 | 0
12 months or more, unrealized (loss), available for sale securities | 0 | 0
Total, fair value, available for sale securities | 59,563,000 | 17,367,000
Total, unrealized (loss), available for sale securities | (739,000) | (80,000)
Municipal Bonds [Member] |  |
Less than 12 months, fair value, available for sale securities | 20,523,000 | 1,020,000
Less than 12 months, unrealized (loss), available for sale securities | (233,000) | (2,000)
12 months or more, fair value, available for sale securities | 0 | 0
12 months or more, unrealized (loss), available for sale securities | 0 | 0
Total, fair value, available for sale securities | 20,523,000 | 1,020,000
Total, unrealized (loss), available for sale securities | $ (233,000) | $ (2,000)

X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fxnc_USAgencyAndMortgagebackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |