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Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 5,681	$ 20,048	$ 17,506	$ 40,575
Weighted-average number of common shares outstanding - basic (shares)	31,154,292	31,564,893	31,101,037	31,495,082
Share-based compensation plans (shares)	471,449	807,258	446,985	823,245
Warrants (shares)	0	8,511	0	8,566
Weighted-average number of common shares - diluted (shares)	31,625,741	32,380,662	31,548,022	32,326,893
Basic earnings per common share (usd per share)	$ 0.18	$ 0.64	$ 0.56	$ 1.29
Diluted earnings per common share (usd per share)	$ 0.18	$ 0.62	$ 0.55	$ 1.26

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