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Allowance for Loan Losses - Troubled Debt Restructurings that Subsequently Defaulted (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 Contracts
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructuring loan subsequent default, Number of contracts |  |  | 4
Troubled debt restructuring loan subsequent default, Recorded investment | $ 0 | $ 0 | $ 596,000
Real Estate Loans [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructuring loan subsequent default, Number of contracts |  |  | 1
Troubled debt restructuring loan subsequent default, Recorded investment |  |  | 235,000
Real Estate Loans [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructuring loan subsequent default, Number of contracts |  |  |
Troubled debt restructuring loan subsequent default, Recorded investment |  |  |
Real Estate Loans [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructuring loan subsequent default, Number of contracts |  |  | 3
Troubled debt restructuring loan subsequent default, Recorded investment |  |  | 361,000
Commercial and Industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructuring loan subsequent default, Number of contracts |  |  |
Troubled debt restructuring loan subsequent default, Recorded investment |  |  |
Consumer and Other Loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructuring loan subsequent default, Number of contracts |  |  |
Troubled debt restructuring loan subsequent default, Recorded investment |  |  |

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- Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524 + Details
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