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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | $ 366,827 | $ 383,594 | $ 380,752
Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 34,404 | 43,524 |
Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 142,446 | 134,964 |
Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 156,691 | 176,573 |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 21,316 | 20,718 |
Consumer and Other Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 11,970 | 7,815 |
Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 304,503 | 304,351 |
Pass [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 21,157 | 22,384 |
Pass [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 131,597 | 120,692 |
Pass [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 119,862 | 134,701 |
Pass [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 19,917 | 18,831 |
Pass [Member] | Consumer and Other Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 11,970 | 7,743 |
Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 23,226 | 26,614 |
Special Mention [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 2,190 | 5,176 |
Special Mention [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 4,692 | 6,055 |
Special Mention [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 15,638 | 14,513 |
Special Mention [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 706 | 798 |
Special Mention [Member] | Consumer and Other Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total |  | 72 |
Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 39,098 | 52,629 |
Substandard [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 11,057 | 15,964 |
Substandard [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 6,157 | 8,217 |
Substandard [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 21,191 | 27,359 |
Substandard [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 693 | 1,089 |
Substandard [Member] | Consumer and Other Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total |  |  |
Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total |  |  |
Doubtful [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total |  |  |
Doubtful [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total |  |  |
Doubtful [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total |  |  |
Doubtful [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total |  |  |
Doubtful [Member] | Consumer and Other Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total |  |  |

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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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