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Business Combination - Additional Information (Detail) (USD $)
0 Months Ended
Jul. 17, 2012
Nov. 12, 2013
SCB Bancorp [Member]
Dec. 31, 2013
SCB Bancorp [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   $ 21.43  
Estimated transaction value   $ 18,400,000  
Reported total assets of acquiree 245,644,000   159.7
Total deposits held by acquiree 218,728,000   124.7
Total loans of acquiree     $ 135.9