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Shares Repurchased - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	Apr. 27, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Apr. 11, 2018	Oct. 29, 2014
Maximum [Member]
Class of Stock [Line Items]
Total Leverage Ratio						175.00%
Three-Year Share Repurchase Program [Member]
Class of Stock [Line Items]
Common stock purchase authorized amount							$ 100,000,000
Share repurchase program, increase in authorized amount	$ 60,000,000
Share repurchase program, extended term date	Apr. 27, 2019
Repurchased common stock, shares		26,717	7,967	87,225	354,496
Repurchased common stock, value		$ 272,000	$ 65,000	$ 1,006,000	$ 3,693,000
Dollar amount remaining available for future share repurchases		$ 87,608,000		$ 87,608,000

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Amount of stock repurchase plan authorized.

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Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Percentage of tier one capital to total leverage exposure, as defined by regulatory framework.

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The increased amount authorized by the entity's Board of Directors to the existing share repurchase program.

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