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Share Repurchase Program - Additional Information (Detail) - USD ($)		1 Months Ended			12 Months Ended
	Nov. 05, 2018	Jan. 31, 2019	Dec. 31, 2018	Nov. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Equity Class Of Treasury Stock [Line Items]
Common stock, par value	$ 0.10		$ 0.10		$ 0.10	$ 0.10
Amount paid for common shares purchase					$ 2,604,000	$ 7,287,000
Common Stock
Equity Class Of Treasury Stock [Line Items]
Number of shares intended to repurchase under repurchase program		$ 2,604,000	$ 3,921,000	$ 3,366,000	$ 2,604,000	$ 7,287,000
Shares repurchase program, expiration date	Mar. 08, 2019
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
Common Stock | Maximum
Equity Class Of Treasury Stock [Line Items]
Number of shares intended to repurchase under repurchase program	$ 20,000

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Face amount or stated value per share of common stock.

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

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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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