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Trust Preferred Capital Notes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
First National (VA) Statutory Trust II [Member] |  |
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items] |  |
Formation of wholly-owned subsidiary | Jun. 08, 2004 |
Preferred securities issued through pooled underwriting date | Jun. 17, 2004 |
Issuance of trust preferred securities | $ 5.0 |
LIBOR-indexed floating rate of interest | 2.83% | 2.84%
Junior subordinated debt securities | 5.2 |
Securities mandatory redemption date | Jun. 17, 2034 |
First National (VA) Statutory Trust III [Member] |  |
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items] |  |
Formation of wholly-owned subsidiary | Jul. 24, 2006 |
Preferred securities issued through pooled underwriting date | Jul. 31, 2006 |
Issuance of trust preferred securities | 4.0 |
LIBOR-indexed floating rate of interest | 1.83% | 1.85%
Junior subordinated debt securities | $ 4.1 |
Securities mandatory redemption date | Oct. 01, 2036 |
Maximum capital required for capital adequacy | 25.00% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the debt instrument was issued, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + 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 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Date the subsidiary of the limited liability company (LLC) or limited partnership (LP) was formed, in CCYY-MM-DD format. + References No definition available. + Details
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