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Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 52,831	$ 47,085	$ 19,137	$ (515)	$ 23,911	$ 23,451	$ 5,681	$ 11,825	$ 118,537	$ 64,868	$ 57,236
Weighted-average number of common shares outstanding – basic (shares)									31,506,699	31,183,841	31,570,118
Share-based compensation plans (shares)									221,085	462,375	658,739
Warrants (shares)									0	0	4,241
Weighted-average number of common shares – diluted (shares)									31,727,784	31,646,216	32,233,098
Basic earnings per common share (usd per share)	$ 1.67	$ 1.49	$ 0.61	$ (0.02)	$ 0.76	$ 0.75	$ 0.18	$ 0.38	$ 3.76	$ 2.08	$ 1.81
Diluted earnings per share (usd per share)	$ 1.65	$ 1.48	$ 0.61	$ (0.02)	$ 0.75	$ 0.74	$ 0.18	$ 0.38	$ 3.74	$ 2.05	$ 1.78

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