XML 50 R38.htm IDEA: XBRL DOCUMENT v3.24.2.u1

Note 2 - Securities - Credit Quality Indicators for Held to Maturity Securities (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Amortized cost, held to maturity securities		$ 123,606	$ 148,351
Moody's, Aaa Rating [Member]
Amortized cost, held to maturity securities		45,254	64,828
Moody's, Aa1/Aa2/Aa3 Rating [Member]
Amortized cost, held to maturity securities		8,494	8,842
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]	66,858	71,681
US Treasury Securities [Member]
Amortized cost, held to maturity securities		19,404	39,085
US Treasury Securities [Member] | Moody's, Aaa Rating [Member]
Amortized cost, held to maturity securities		19,404	39,085
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		89,911	94,617
US Agency and Mortgage-backed Securities [Member] | Moody's, Aaa Rating [Member]
Amortized cost, held to maturity securities		23,053	22,936
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]	66,858	71,681
US States and Political Subdivisions Debt Securities [Member]
Amortized cost, held to maturity securities		11,291	11,649
US States and Political Subdivisions Debt Securities [Member] | Moody's, Aaa Rating [Member]
Amortized cost, held to maturity securities		2,797	2,807
US States and Political Subdivisions Debt Securities [Member] | Moody's, Aa1/Aa2/Aa3 Rating [Member]
Amortized cost, held to maturity securities		8,494	8,842
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 implied 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://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7A

Reference 2: 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 3: 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 4: 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

+ 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: