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Shares Repurchased - Additional Information (Detail) - USD ($)		3 Months Ended
	Apr. 24, 2019	Mar. 31, 2019	Mar. 31, 2018	Apr. 11, 2018
Class of Stock [Line Items]
Repurchased common stock, value		$ 2,005,000	$ 734,000
Maximum [Member]
Class of Stock [Line Items]
Total Leverage Ratio				1.75%
Three-Year Share Repurchase Program [Member]
Class of Stock [Line Items]
Repurchased common stock, shares		311,213,000	60,508,000
Repurchased common stock, value		$ 2,005,000	$ 734,000
Dollar amount remaining available for future share repurchases		$ 83,724,000
Three-Year Share Repurchase Program [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Share repurchase program, extended term date	Apr. 27, 2022

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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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