General	6 Months Ended
Jun. 30, 2013
Accounting Policies [Abstract]
General	Note 1. General The accompanying unaudited consolidated financial statements of First National Corporation (the Company) and its subsidiaries, including First Bank (the Bank), have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP. All significant intercompany balances and transactions have been eliminated. In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments and reclassifications of a normal and recurring nature considered necessary to present fairly the financial positions at June 30, 2013 and December 31, 2012, the results of operations and comprehensive income (loss) for the three and six months ended June 30, 2013 and 2012 and the cash flows and changes in shareholders’ equity for the six months ended June 30, 2013 and 2012. The statements should be read in conjunction with the consolidated financial statements and related notes included in the Annual Report on Form 10-K for the year ended December 31, 2012. Operating results for the three and six month periods ended June 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013. Recent Accounting Pronouncements In February 2013, the FASB issued ASU 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” The amendments in this ASU require an entity to present (either on the face of the statement where net income is presented or in the notes) the effects on the line items of net income of significant amounts reclassified out of accumulated other comprehensive income. In addition, the amendments require a cross-reference to other disclosures currently required for other reclassification items to be reclassified directly to net income in their entirety in the same reporting period. Companies should apply these amendments for fiscal years, and interim periods within those years, beginning on or after December 15, 2012. The Company has included the required disclosures from ASU 2013-02 in the consolidated financial statements.

Note 1. General

The accompanying unaudited consolidated financial statements of First National Corporation (the Company) and its subsidiaries, including First Bank (the Bank), have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP. All significant intercompany balances and transactions have been eliminated. In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments and reclassifications of a normal and recurring nature considered necessary to present fairly the financial positions at June 30, 2013 and December 31, 2012, the results of operations and comprehensive income (loss) for the three and six months ended June 30, 2013 and 2012 and the cash flows and changes in shareholders’ equity for the six months ended June 30, 2013 and 2012. The statements should be read in conjunction with the consolidated financial statements and related notes included in the Annual Report on Form 10-K for the year ended December 31, 2012. Operating results for the three and six month periods ended June 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013.

Recent Accounting Pronouncements

In February 2013, the FASB issued ASU 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” The amendments in this ASU require an entity to present (either on the face of the statement where net income is presented or in the notes) the effects on the line items of net income of significant amounts reclassified out of accumulated other comprehensive income. In addition, the amendments require a cross-reference to other disclosures currently required for other reclassification items to be reclassified directly to net income in their entirety in the same reporting period. Companies should apply these amendments for fiscal years, and interim periods within those years, beginning on or after December 15, 2012. The Company has included the required disclosures from ASU 2013-02 in the consolidated financial statements.