XML 64 R52.htm IDEA: XBRL DOCUMENT v3.19.1

Other Real Estate Owned (OREO) - Narrative (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Other Real Estate [Line Items]
Residential real estate carrying amount included in OREO	$ 0		$ 0	$ 326,000
Consumer mortgage loans secured by residential real estate properties in the process of formal foreclosure	149,000
Net expenses applicable to other real estate owned	0	$ 1,000	2,000
Residential real estate properties
Other Real Estate [Line Items]
Residential real estate carrying amount included in OREO	$ 0		$ 0

X

- Definition

Other Real Estate, Foreclosed Assets, In The Process Of Foreclosure Proceedings

+ References

No definition available.

+ Details

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

X

- Definition

Other Real Estate [Line Items]

+ References

No definition available.

+ Details

Name:	fxnc_OtherRealEstateLineItems
Namespace Prefix:	fxnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Other real estate owned expenses.

+ References

No definition available.

+ Details

Name:	fxnc_OtherRealEstateOwnedExpenses
Namespace Prefix:	fxnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_OtherRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_ApartmentBuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: