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Summary of Number of Shares of Common Stock Repurchased (Detail) - Common Stock - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			12 Months Ended
	Jan. 31, 2019	Dec. 31, 2018	Nov. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Equity Class Of Treasury Stock [Line Items]
Total number of shares purchased	158,048	255,500	196,858	158,048	452,358
Average price paid per share	$ 16.48	$ 15.35	$ 17.10	$ 16.48	$ 16.11
Total amount paid	$ 2,604	$ 3,921	$ 3,366	$ 2,604	$ 7,287

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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