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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-59 Days Past Due | $ 5,990 | $ 4,636 |
60-89 Days Past Due | 888 | 1,800 |
> 90 Days Past Due | 4,718 | 2,148 |
Total Past Due | 11,596 | 8,584 |
Current | 355,231 | 375,010 |
Total Loans | 366,827 | 383,594 | 380,752
Non-accrual Loans | 8,000 | 8,393 |
90 Days or More Past Due and Accruing | 2,150 | 228 |
Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-59 Days Past Due | 1,196 | 77 |
60-89 Days Past Due |  | 701 |
> 90 Days Past Due | 3,374 | 89 |
Total Past Due | 4,570 | 867 |
Current | 29,834 | 42,657 |
Total Loans | 34,404 | 43,524 |
Non-accrual Loans | 1,560 | 646 |
90 Days or More Past Due and Accruing | 1,834 |  |
Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-59 Days Past Due | 1,047 | 2,741 |
60-89 Days Past Due | 250 |  |
> 90 Days Past Due | 108 | 476 |
Total Past Due | 1,405 | 3,217 |
Current | 141,041 | 131,747 |
Total Loans | 142,446 | 134,964 |
Non-accrual Loans | 947 | 968 |
90 Days or More Past Due and Accruing |  | 129 |
Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-59 Days Past Due | 3,728 | 1,347 |
60-89 Days Past Due | 519 | 686 |
> 90 Days Past Due | 1,117 | 1,476 |
Total Past Due | 5,364 | 3,509 |
Current | 151,327 | 173,064 |
Total Loans | 156,691 | 176,573 |
Non-accrual Loans | 5,403 | 6,752 |
90 Days or More Past Due and Accruing | 277 |  |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-59 Days Past Due | 2 | 428 |
60-89 Days Past Due | 119 | 408 |
> 90 Days Past Due | 119 | 99 |
Total Past Due | 240 | 935 |
Current | 21,076 | 19,783 |
Total Loans | 21,316 | 20,718 |
Non-accrual Loans | 89 | 14 |
90 Days or More Past Due and Accruing | 39 | 99 |
Consumer and Other Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-59 Days Past Due | 17 | 43 |
60-89 Days Past Due |  | 5 |
> 90 Days Past Due |  | 8 |
Total Past Due | 17 | 56 |
Current | 11,953 | 7,759 |
Total Loans | 11,970 | 7,815 |
Non-accrual Loans | 1 | 13 |
90 Days or More Past Due and Accruing |  |  |

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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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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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