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Business Combination - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified |  |  |  | 0 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 SCB Bancorp [Member] | Apr. 03, 2014 SCB Bancorp [Member] Subsequent Event [Member]
Business Combination Transactions [Line Items] |  |  |  |
Exchange ratio per share to SCB shareholder |  |  |  | $ 0.4904
Cash paid for each share to SCB shareholder |  |  |  | $ 5.15
Market closing price per share |  |  |  | $ 22.23
Estimated transaction value |  |  |  | $ 18.9
Common stock outstanding | 8,630,966 | 8,630,966 |  | 1,164,442
Common stock issued |  |  |  | 570,820
Reported total assets of acquiree |  |  | 154.1 |
Total deposits held by acquiree |  |  | 119.3 |
Total loans of acquiree |  |  | $ 130.9 |

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