XML 49 R38.htm IDEA: XBRL DOCUMENT
v3.23.2

Note 2 - Securities - Credit Quality Indicators for Held to Maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized cost, held to maturity securities |  | $ 151,821 | $ 153,158
Moody's, Aaa Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 64,574 | 64,043
Moody's, Aa1/Aa2/Aa3 Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 8,843 | 9,447
Moody's, Baa1/ Baa2/ Baa3 Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 3,000 | 3,000
Not Rated - Agency [Member] |  |  |
Amortized cost, held to maturity securities | [1] | 75,404 | 76,668
US Treasury Securities [Member] |  |  |
Amortized cost, held to maturity securities |  | 38,639 | 38,211
US Treasury Securities [Member] | Moody's, Aaa Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 38,639 | 38,211
US Treasury Securities [Member] | Moody's, Aa1/Aa2/Aa3 Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 0 | 0
US Treasury Securities [Member] | Moody's, Baa1/ Baa2/ Baa3 Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 0 | 0
US Treasury Securities [Member] | Not Rated - Agency [Member] |  |  |
Amortized cost, held to maturity securities | [1] | 0 | 0
US Agency and Mortgage-backed Securities [Member] |  |  |
Amortized cost, held to maturity securities |  | 98,223 | 99,374
US Agency and Mortgage-backed Securities [Member] | Moody's, Aaa Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 22,819 | 22,706
US Agency and Mortgage-backed Securities [Member] | Moody's, Aa1/Aa2/Aa3 Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 0 | 0
US Agency and Mortgage-backed Securities [Member] | Moody's, Baa1/ Baa2/ Baa3 Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 0 | 0
US Agency and Mortgage-backed Securities [Member] | Not Rated - Agency [Member] |  |  |
Amortized cost, held to maturity securities | [1] | 75,404 | 76,668
US States and Political Subdivisions Debt Securities [Member] |  |  |
Amortized cost, held to maturity securities |  | 11,959 | 12,573
US States and Political Subdivisions Debt Securities [Member] | Moody's, Aaa Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 3,116 | 3,126
US States and Political Subdivisions Debt Securities [Member] | Moody's, Aa1/Aa2/Aa3 Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 8,843 | 9,447
US States and Political Subdivisions Debt Securities [Member] | Moody's, Baa1/ Baa2/ Baa3 Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 0 | 0
US States and Political Subdivisions Debt Securities [Member] | Not Rated - Agency [Member] |  |  |
Amortized cost, held to maturity securities | [1] | 0 | 0
Corporate Debt Securities [Member] |  |  |
Amortized cost, held to maturity securities |  | 3,000 | 3,000
Corporate Debt Securities [Member] | Moody's, Aaa Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 0 | 0
Corporate Debt Securities [Member] | Moody's, Aa1/Aa2/Aa3 Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 0 | 0
Corporate Debt Securities [Member] | Moody's, Baa1/ Baa2/ Baa3 Rating [Member] |  |  |
Amortized cost, held to maturity securities |  | 3,000 | 3,000
Corporate Debt Securities [Member] | Not Rated - Agency [Member] |  |  |
Amortized cost, held to maturity securities | [1] | $ 0 | $ 0
[1] | Generally considered not to have credit risk given the governmental guarantees associated with these agencies

X
- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-14 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7A -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-7A + Details
Name: | us-gaap_HeldToMaturitySecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_CreditRatingMoodysAxis=srt_MoodysAaaRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingMoodysAxis=fxnc_MoodysAa1aa2aa3RatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingMoodysAxis=fxnc_MoodysBaa1Baa2Baa3RatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingMoodysAxis=fxnc_NotRatedAgencyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |