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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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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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