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Note 4 - Allowance for Credit Losses - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Nonaccrual, No Allowance	$ 3,245	$ 2,435
Nonaccrual, With Allowance	3,551	4,536
Non-accrual loans	6,796	6,971
Real Estate 1 [Member] | Construction and Land Development [Member]
Nonaccrual, No Allowance	48	50
Nonaccrual, With Allowance	0	0
Non-accrual loans	48	50
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Nonaccrual, No Allowance	2,218	2,148
Nonaccrual, With Allowance	0	0
Non-accrual loans	2,218	2,148
Other Real Estate Loans [Member]
Nonaccrual, No Allowance	932	0
Nonaccrual, With Allowance	0	0
Non-accrual loans	932	0
Commercial and Industrial Loans [Member]
Nonaccrual, No Allowance	46	237
Nonaccrual, With Allowance	3,551	4,536
Non-accrual loans	3,597	4,773
Consumer and Other Loans [Member]
Nonaccrual, No Allowance	1	0
Nonaccrual, With Allowance	0	0
Non-accrual loans	$ 1	$ 0

X

- Definition

Amortized cost of financing receivable on nonaccrual status with allowance for credit loss. Excludes net investment in lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	fxnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

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X

- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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- Details

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X

- Details

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- Details

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X

- Details

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