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Note 4 - Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Beginning balance	$ 5,009	$ 5,326	$ 5,326
Charge-offs	(447)	(500)	(1,169)
Recoveries	233	113	252
Provision for (recovery of) loan losses	200	100	600
Ending balance	4,995	5,039	5,009
Individually evaluated for impairment, allowance	101		243
Collectively evaluated for impairment, allowance	4,894	5,039	4,766
Loans	574,954	530,933	542,856
Individually evaluated for impairment, loans	1,775	4,481	3,436
Collectively evaluated for impairment, loans	573,179	526,452	539,420
Real Estate 1 [Member] | Construction and Land Development [Member]
Beginning balance	561	414	414
Charge-offs
Recoveries	50
Provision for (recovery of) loan losses	(71)	(8)	147
Ending balance	540	406	561
Individually evaluated for impairment, allowance	46		71
Collectively evaluated for impairment, allowance	494	406	490
Loans	46,281	37,350	45,867
Individually evaluated for impairment, loans	391	865	327
Collectively evaluated for impairment, loans	45,890	36,485	45,540
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance	895	775	775
Charge-offs	(58)	(24)	(55)
Recoveries	5	8	13
Provision for (recovery of) loan losses	(64)	32	162
Ending balance	778	791	895
Individually evaluated for impairment, allowance	20		172
Collectively evaluated for impairment, allowance	758	791	723
Loans	225,820	211,101	215,945
Individually evaluated for impairment, loans	866	1,330	663
Collectively evaluated for impairment, loans	224,954	209,771	215,282
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Beginning balance	2,160	2,948	2,948
Charge-offs
Recoveries		1	5
Provision for (recovery of) loan losses	233	(285)	(793)
Ending balance	2,393	2,664	2,160
Individually evaluated for impairment, allowance	35
Collectively evaluated for impairment, allowance	2,358	2,664	2,160
Loans	237,370	224,362	219,553
Individually evaluated for impairment, loans	518	2,029	2,249
Collectively evaluated for impairment, loans	236,852	222,333	217,304
Commercial and Industrial Loans [Member]
Beginning balance	464	418	418
Charge-offs	(2)	(8)	(10)
Recoveries	4	5	8
Provision for (recovery of) loan losses	50	10	48
Ending balance	516	425	464
Individually evaluated for impairment, allowance
Collectively evaluated for impairment, allowance	516	425	464
Loans	49,353	40,943	44,605
Individually evaluated for impairment, loans		257	197
Collectively evaluated for impairment, loans	49,353	40,686	44,408
Consumer and Other Loans [Member]
Beginning balance	929	771	771
Charge-offs	(387)	(468)	(1,104)
Recoveries	174	99	226
Provision for (recovery of) loan losses	52	351	1,036
Ending balance	768	753	929
Individually evaluated for impairment, allowance
Collectively evaluated for impairment, allowance	768	753	929
Loans	16,130	17,177	16,886
Individually evaluated for impairment, loans
Collectively evaluated for impairment, loans	$ 16,130	$ 17,177	$ 16,886

X

- Definition

Represents the amount of provision (reduction in reserve) for loan losses during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	fxnc_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

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X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

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-Topic 310
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-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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