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Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 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

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