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Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Oct. 08, 2015
Business Combination Separately Recognized Transactions [Line Items]        
Goodwill   $ 54,042 $ 54,042  
Gains on sale of other real estate owned $ 1,200      
Bank of Commerce [Member]        
Business Combination Separately Recognized Transactions [Line Items]        
Total assets acquired       $ 196,000
Loans       147,000
Deposits       175,000
Equity capital       $ 22,000
Percentage of voting interests acquired       100.00%
Intangibles assets, net       $ 7,100
Goodwill       $ 9,400