3.21.2 html 388 434 1 true 85 0 false 7 false false R1.htm 000 - Document - Document And Entity Information Sheet http://www.fbvirginia.com/20210630/role/statement-document-and-entity-information Document And Entity Information Cover 1 false false R2.htm 001 - Statement - Consolidated Balance Sheets (Current Period Unaudited) Sheet http://www.fbvirginia.com/20210630/role/statement-consolidated-balance-sheets-current-period-unaudited Consolidated Balance Sheets (Current Period Unaudited) Statements 2 false false R3.htm 002 - Statement - Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) Sheet http://www.fbvirginia.com/20210630/role/statement-consolidated-balance-sheets-current-period-unaudited-parentheticals Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) Statements 3 false false R4.htm 003 - Statement - Consolidated Statements of Income (Unaudited) Sheet http://www.fbvirginia.com/20210630/role/statement-consolidated-statements-of-income-unaudited Consolidated Statements of Income (Unaudited) Statements 4 false false R5.htm 004 - Statement - Consolidated Statements of Comprehensive Income (Unaudited) Sheet http://www.fbvirginia.com/20210630/role/statement-consolidated-statements-of-comprehensive-income-unaudited Consolidated Statements of Comprehensive Income (Unaudited) Statements 5 false false R6.htm 005 - Statement - Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) Sheet http://www.fbvirginia.com/20210630/role/statement-consolidated-statements-of-comprehensive-income-unaudited-parentheticals Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) Statements 6 false false R7.htm 006 - Statement - Consolidated Statements of Cash Flows (Unaudited) Sheet http://www.fbvirginia.com/20210630/role/statement-consolidated-statements-of-cash-flows-unaudited Consolidated Statements of Cash Flows (Unaudited) Statements 7 false false R8.htm 007 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Unaudited) Sheet http://www.fbvirginia.com/20210630/role/statement-consolidated-statements-of-changes-in-shareholders-equity-unaudited Consolidated Statements of Changes in Shareholders' Equity (Unaudited) Statements 8 false false R9.htm 008 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) Sheet http://www.fbvirginia.com/20210630/role/statement-consolidated-statements-of-changes-in-shareholders-equity-unaudited-parentheticals Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) Statements 9 false false R10.htm 009 - Disclosure - Note 1 - General Sheet http://www.fbvirginia.com/20210630/role/statement-note-1-general Note 1 - General Notes 10 false false R11.htm 010 - Disclosure - Note 2 - Securities Sheet http://www.fbvirginia.com/20210630/role/statement-note-2-securities Note 2 - Securities Notes 11 false false R12.htm 011 - Disclosure - Note 3 - Loans Sheet http://www.fbvirginia.com/20210630/role/statement-note-3-loans Note 3 - Loans Notes 12 false false R13.htm 012 - Disclosure - Note 4 - Allowance for Loan Losses Sheet http://www.fbvirginia.com/20210630/role/statement-note-4-allowance-for-loan-losses Note 4 - Allowance for Loan Losses Notes 13 false false R14.htm 013 - Disclosure - Note 5 - Other Real Estate Owned (OREO) Sheet http://www.fbvirginia.com/20210630/role/statement-note-5-other-real-estate-owned-oreo Note 5 - Other Real Estate Owned (OREO) Notes 14 false false R15.htm 014 - Disclosure - Note 6 - Other Borrowings Sheet http://www.fbvirginia.com/20210630/role/statement-note-6-other-borrowings Note 6 - Other Borrowings Notes 15 false false R16.htm 015 - Disclosure - Note 7 - Capital Requirements Sheet http://www.fbvirginia.com/20210630/role/statement-note-7-capital-requirements Note 7 - Capital Requirements Notes 16 false false R17.htm 016 - Disclosure - Note 8 - Subordinated Debt Sheet http://www.fbvirginia.com/20210630/role/statement-note-8-subordinated-debt- Note 8 - Subordinated Debt Notes 17 false false R18.htm 017 - Disclosure - Note 9 - Junior Subordinated Debt Sheet http://www.fbvirginia.com/20210630/role/statement-note-9-junior-subordinated-debt Note 9 - Junior Subordinated Debt Notes 18 false false R19.htm 018 - Disclosure - Note 10 - Benefit Plans Sheet http://www.fbvirginia.com/20210630/role/statement-note-10-benefit-plans Note 10 - Benefit Plans Notes 19 false false R20.htm 019 - Disclosure - Note 11 - Earnings Per Common Share Sheet http://www.fbvirginia.com/20210630/role/statement-note-11-earnings-per-common-share Note 11 - Earnings Per Common Share Notes 20 false false R21.htm 020 - Disclosure - Note 12 - Fair Value Measurements Sheet http://www.fbvirginia.com/20210630/role/statement-note-12-fair-value-measurements Note 12 - Fair Value Measurements Notes 21 false false R22.htm 021 - Disclosure - Note 13 - Stock Compensation Plans Sheet http://www.fbvirginia.com/20210630/role/statement-note-13-stock-compensation-plans Note 13 - Stock Compensation Plans Notes 22 false false R23.htm 022 - Disclosure - Note 14 - Accumulated Other Comprehensive Income (Loss) Sheet http://www.fbvirginia.com/20210630/role/statement-note-14-accumulated-other-comprehensive-income-loss Note 14 - Accumulated Other Comprehensive Income (Loss) Notes 23 false false R24.htm 023 - Disclosure - Note 15 - Revenue Recognition Sheet http://www.fbvirginia.com/20210630/role/statement-note-15-revenue-recognition Note 15 - Revenue Recognition Notes 24 false false R25.htm 024 - Disclosure - Note 16 - Derivative Financial Instruments Sheet http://www.fbvirginia.com/20210630/role/statement-note-16-derivative-financial-instruments- Note 16 - Derivative Financial Instruments Notes 25 false false R26.htm 025 - Disclosure - Note 17 - Acquisition Sheet http://www.fbvirginia.com/20210630/role/statement-note-17-acquisition Note 17 - Acquisition Notes 26 false false R27.htm 026 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.fbvirginia.com/20210630/role/statement-significant-accounting-policies-policies Significant Accounting Policies (Policies) Policies 27 false false R28.htm 027 - Disclosure - Note 2 - Securities (Tables) Sheet http://www.fbvirginia.com/20210630/role/statement-note-2-securities-tables Note 2 - Securities (Tables) Tables http://www.fbvirginia.com/20210630/role/statement-note-2-securities 28 false false R29.htm 028 - Disclosure - Note 3 - Loans (Tables) Sheet http://www.fbvirginia.com/20210630/role/statement-note-3-loans-tables Note 3 - Loans (Tables) Tables http://www.fbvirginia.com/20210630/role/statement-note-3-loans 29 false false R30.htm 029 - Disclosure - Note 4 - Allowance for Loan Losses (Tables) Sheet http://www.fbvirginia.com/20210630/role/statement-note-4-allowance-for-loan-losses-tables Note 4 - Allowance for Loan Losses (Tables) Tables http://www.fbvirginia.com/20210630/role/statement-note-4-allowance-for-loan-losses 30 false false R31.htm 030 - Disclosure - Note 5 - Other Real Estate Owned (OREO) (Tables) Sheet http://www.fbvirginia.com/20210630/role/statement-note-5-other-real-estate-owned-oreo-tables Note 5 - Other Real Estate Owned (OREO) (Tables) Tables http://www.fbvirginia.com/20210630/role/statement-note-5-other-real-estate-owned-oreo 31 false false R32.htm 031 - Disclosure - Note 7 - Capital Requirements (Tables) Sheet http://www.fbvirginia.com/20210630/role/statement-note-7-capital-requirements-tables Note 7 - Capital Requirements (Tables) Tables http://www.fbvirginia.com/20210630/role/statement-note-7-capital-requirements 32 false false R33.htm 032 - Disclosure - Note 11 - Earnings Per Common Share (Tables) Sheet http://www.fbvirginia.com/20210630/role/statement-note-11-earnings-per-common-share-tables Note 11 - Earnings Per Common Share (Tables) Tables http://www.fbvirginia.com/20210630/role/statement-note-11-earnings-per-common-share 33 false false R34.htm 033 - Disclosure - Note 12 - Fair Value Measurements (Tables) Sheet http://www.fbvirginia.com/20210630/role/statement-note-12-fair-value-measurements-tables Note 12 - Fair Value Measurements (Tables) Tables http://www.fbvirginia.com/20210630/role/statement-note-12-fair-value-measurements 34 false false R35.htm 034 - Disclosure - Note 13 - Stock Compensation Plans (Tables) Sheet http://www.fbvirginia.com/20210630/role/statement-note-13-stock-compensation-plans-tables Note 13 - Stock Compensation Plans (Tables) Tables http://www.fbvirginia.com/20210630/role/statement-note-13-stock-compensation-plans 35 false false R36.htm 035 - Disclosure - Note 14 - Accumulated Other Comprehensive Income (Loss) (Tables) Sheet http://www.fbvirginia.com/20210630/role/statement-note-14-accumulated-other-comprehensive-income-loss-tables Note 14 - Accumulated Other Comprehensive Income (Loss) (Tables) Tables http://www.fbvirginia.com/20210630/role/statement-note-14-accumulated-other-comprehensive-income-loss 36 false false R37.htm 036 - Disclosure - Note 15 - Revenue Recognition (Tables) Sheet http://www.fbvirginia.com/20210630/role/statement-note-15-revenue-recognition-tables Note 15 - Revenue Recognition (Tables) Tables http://www.fbvirginia.com/20210630/role/statement-note-15-revenue-recognition 37 false false R38.htm 037 - Disclosure - Note 16 - Derivative Financial Instruments (Tables) Sheet http://www.fbvirginia.com/20210630/role/statement-note-16-derivative-financial-instruments-tables Note 16 - Derivative Financial Instruments (Tables) Tables http://www.fbvirginia.com/20210630/role/statement-note-16-derivative-financial-instruments- 38 false false R39.htm 038 - Disclosure - Note 1 - General (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-1-general-details-textual Note 1 - General (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-1-general 39 false false R40.htm 039 - Disclosure - Note 2 - Securities (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-2-securities-details-textual Note 2 - Securities (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-2-securities-tables 40 false false R41.htm 040 - Disclosure - Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-2-securities-summary-of-amortized-costs-and-fair-values-of-securities-details Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) Details 41 false false R42.htm 041 - Disclosure - Note 2 - Securities - Investments in an Unrealized Loss Position That Were Temporarily Impaired (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-2-securities-investments-in-an-unrealized-loss-position-that-were-temporarily-impaired-details Note 2 - Securities - Investments in an Unrealized Loss Position That Were Temporarily Impaired (Details) Details 42 false false R43.htm 042 - Disclosure - Note 2 - Securities - Amortized Cost and Fair Value of Securities (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-2-securities-amortized-cost-and-fair-value-of-securities-details Note 2 - Securities - Amortized Cost and Fair Value of Securities (Details) Details 43 false false R44.htm 043 - Disclosure - Note 2 - Securities - Composition of Restricted Securities (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-2-securities-composition-of-restricted-securities-details Note 2 - Securities - Composition of Restricted Securities (Details) Details 44 false false R45.htm 044 - Disclosure - Note 3 - Loans (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-3-loans-details-textual Note 3 - Loans (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-3-loans-tables 45 false false R46.htm 045 - Disclosure - Note 3 - Loans - Summary of Loans (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-3-loans-summary-of-loans-details Note 3 - Loans - Summary of Loans (Details) Details 46 false false R47.htm 046 - Disclosure - Note 3 - Loans - Summary of Loan Classes and an Aging of Past Due Loans (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-3-loans-summary-of-loan-classes-and-an-aging-of-past-due-loans-details Note 3 - Loans - Summary of Loan Classes and an Aging of Past Due Loans (Details) Details 47 false false R48.htm 047 - Disclosure - Note 3 - Loans - Analysis of the Credit Risk Profile of Each Loan Class (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-3-loans-analysis-of-the-credit-risk-profile-of-each-loan-class-details Note 3 - Loans - Analysis of the Credit Risk Profile of Each Loan Class (Details) Details 48 false false R49.htm 048 - Disclosure - Note 4 - Allowance for Loan Losses (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-4-allowance-for-loan-losses-details-textual Note 4 - Allowance for Loan Losses (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-4-allowance-for-loan-losses-tables 49 false false R50.htm 049 - Disclosure - Note 4 - Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-4-allowance-for-loan-losses-allowance-by-impairment-methodology-and-loans-by-impairment-methodology-details Note 4 - Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Details) Details 50 false false R51.htm 050 - Disclosure - Note 4 - Allowance for Loan Losses - Impaired Loans and Related Allowances (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-4-allowance-for-loan-losses-impaired-loans-and-related-allowances-details Note 4 - Allowance for Loan Losses - Impaired Loans and Related Allowances (Details) Details 51 false false R52.htm 051 - Disclosure - Note 5 - Other Real Estate Owned (OREO) (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-5-other-real-estate-owned-oreo-details-textual Note 5 - Other Real Estate Owned (OREO) (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-5-other-real-estate-owned-oreo-tables 52 false false R53.htm 052 - Disclosure - Note 5 - Other Real Estate Owned (OREO) - Changes in Balance for OREO (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-5-other-real-estate-owned-oreo-changes-in-balance-for-oreo-details Note 5 - Other Real Estate Owned (OREO) - Changes in Balance for OREO (Details) Details http://www.fbvirginia.com/20210630/role/statement-note-5-other-real-estate-owned-oreo-tables 53 false false R54.htm 053 - Disclosure - Note 6 - Other Borrowings (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-6-other-borrowings-details-textual Note 6 - Other Borrowings (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-6-other-borrowings 54 false false R55.htm 054 - Disclosure - Note 7 - Capital Requirements (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-7-capital-requirements-details-textual Note 7 - Capital Requirements (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-7-capital-requirements-tables 55 false false R56.htm 055 - Disclosure - Note 7 - Capital Requirements - Comparison of Capital of Company and Bank with Minimum Regulatory Guidelines (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-7-capital-requirements-comparison-of-capital-of-company-and-bank-with-minimum-regulatory-guidelines-details Note 7 - Capital Requirements - Comparison of Capital of Company and Bank with Minimum Regulatory Guidelines (Details) Details 56 false false R57.htm 056 - Disclosure - Note 8 - Subordinated Debt (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-8-subordinated-debt-details-textual Note 8 - Subordinated Debt (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-8-subordinated-debt- 57 false false R58.htm 057 - Disclosure - Note 9 - Junior Subordinated Debt (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-9-junior-subordinated-debt-details-textual Note 9 - Junior Subordinated Debt (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-9-junior-subordinated-debt 58 false false R59.htm 058 - Disclosure - Note 10 - Benefit Plans (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-10-benefit-plans-details-textual Note 10 - Benefit Plans (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-10-benefit-plans 59 false false R60.htm 059 - Disclosure - Note 11 - Earnings Per Common Share (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-11-earnings-per-common-share-details-textual Note 11 - Earnings Per Common Share (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-11-earnings-per-common-share-tables 60 false false R61.htm 060 - Disclosure - Note 11 - Earnings Per Common Share - Basic and Diluted Earnings Per Share (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-11-earnings-per-common-share-basic-and-diluted-earnings-per-share-details Note 11 - Earnings Per Common Share - Basic and Diluted Earnings Per Share (Details) Details 61 false false R62.htm 061 - Disclosure - Note 12 - Fair Value Measurements (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-12-fair-value-measurements-details-textual Note 12 - Fair Value Measurements (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-12-fair-value-measurements-tables 62 false false R63.htm 062 - Disclosure - Note 12 - Fair Value Measurements - Balances of Assets Measured at Fair Value on Recurring Basis (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-12-fair-value-measurements-balances-of-assets-measured-at-fair-value-on-recurring-basis-details Note 12 - Fair Value Measurements - Balances of Assets Measured at Fair Value on Recurring Basis (Details) Details 63 false false R64.htm 063 - Disclosure - Note 12 - Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-12-fair-value-measurements-assets-measured-at-fair-value-on-a-nonrecurring-basis-details Note 12 - Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) Details 64 false false R65.htm 064 - Disclosure - Note 12 - Fair Value Measurements - Quantitative Information About Level 3 Fair Value Measurements (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-12-fair-value-measurements-quantitative-information-about-level-3-fair-value-measurements-details Note 12 - Fair Value Measurements - Quantitative Information About Level 3 Fair Value Measurements (Details) Details 65 false false R66.htm 065 - Disclosure - Note 12 - Fair Value Measurements - Carrying Values and Estimated Values of Financial Instruments (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-12-fair-value-measurements-carrying-values-and-estimated-values-of-financial-instruments-details Note 12 - Fair Value Measurements - Carrying Values and Estimated Values of Financial Instruments (Details) Details 66 false false R67.htm 066 - Disclosure - Note 13 - Stock Compensation Plans (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-13-stock-compensation-plans-details-textual Note 13 - Stock Compensation Plans (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-13-stock-compensation-plans-tables 67 false false R68.htm 067 - Disclosure - Note 13 - Stock Compensation Plans - Summary of Restricted Stock Unit Activity (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-13-stock-compensation-plans-summary-of-restricted-stock-unit-activity-details Note 13 - Stock Compensation Plans - Summary of Restricted Stock Unit Activity (Details) Details 68 false false R69.htm 068 - Disclosure - Note 14 - Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-14-accumulated-other-comprehensive-income-loss-changes-in-each-component-of-accumulated-other-comprehensive-income-loss-details Note 14 - Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Details) Details http://www.fbvirginia.com/20210630/role/statement-note-14-accumulated-other-comprehensive-income-loss-tables 69 false false R70.htm 069 - Disclosure - Note 14 - Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals) Sheet http://www.fbvirginia.com/20210630/role/statement-note-14-accumulated-other-comprehensive-income-loss-changes-in-each-component-of-accumulated-other-comprehensive-income-loss-details-parentheticals Note 14 - Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals) Details http://www.fbvirginia.com/20210630/role/statement-note-14-accumulated-other-comprehensive-income-loss-tables 70 false false R71.htm 070 - Disclosure - Note 14 - Accumulated Other Comprehensive Income (Loss) - Reclassifications from Accumulated Other Comprehensive Loss (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-14-accumulated-other-comprehensive-income-loss-reclassifications-from-accumulated-other-comprehensive-loss-details Note 14 - Accumulated Other Comprehensive Income (Loss) - Reclassifications from Accumulated Other Comprehensive Loss (Details) Details http://www.fbvirginia.com/20210630/role/statement-note-14-accumulated-other-comprehensive-income-loss-tables 71 false false R72.htm 071 - Disclosure - Note 15 - Revenue Recognition - Disaggregation of Revenue (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-15-revenue-recognition-disaggregation-of-revenue-details Note 15 - Revenue Recognition - Disaggregation of Revenue (Details) Details 72 false false R73.htm 072 - Disclosure - Note 16 - Derivative Financial Instruments (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-16-derivative-financial-instruments-details-textual Note 16 - Derivative Financial Instruments (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-16-derivative-financial-instruments-tables 73 false false R74.htm 073 - Disclosure - Note 16 - Derivative Financial Instruments - Derivative Instruments Components (Details) Sheet http://www.fbvirginia.com/20210630/role/statement-note-16-derivative-financial-instruments-derivative-instruments-components-details Note 16 - Derivative Financial Instruments - Derivative Instruments Components (Details) Details 74 false false R75.htm 074 - Disclosure - Note 17 - Acquisition (Details Textual) Sheet http://www.fbvirginia.com/20210630/role/statement-note-17-acquisition-details-textual Note 17 - Acquisition (Details Textual) Details http://www.fbvirginia.com/20210630/role/statement-note-17-acquisition 75 false false All Reports Book All Reports fxnc20210731_10q.htm ex_255364.htm ex_255365.htm ex_255366.htm ex_255367.htm fxnc-20210630.xsd fxnc-20210630_cal.xml fxnc-20210630_def.xml fxnc-20210630_lab.xml fxnc-20210630_pre.xml first1nationalcorporationa09.jpg http://fasb.org/us-gaap/2021-01-31 http://fasb.org/srt/2021-01-31 http://xbrl.sec.gov/dei/2021 true true