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Business Combination - Additional Information (Detail) (USD $)
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1 Months Ended |
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Sep. 16, 2011
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| Business Acquisition [Line Items] | |
| Loans acquired | $ 46,800,000 |
| Assumed deposit liabilities | 179,196,000 |
| Goodwill resulting from acquisition | 8,660,000 |
| Identifiable assets core deposit intangible | 2,402,000 |
| Core deposit intangible, weighted average useful life | 10 years |
| Fair value discount on loan acquired | 700,000 |
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Non-credit quality portion
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| Business Acquisition [Line Items] | |
| Fair value discount on loan acquired | 100,000 |
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Credit quality portion
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| Business Acquisition [Line Items] | |
| Fair value discount on loan acquired | $ 600,000 |
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Mississippi Gulf Coast branches
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| Business Acquisition [Line Items] | |
| Number of branches acquired | 7 |
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Bogalusa, Louisiana
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| Business Acquisition [Line Items] | |
| Number of branches acquired | 1 |