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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 14,247	$ 2,414	$ 20,048	$ 20,527	$ 18,000	$ 4,139	$ 20,107	$ 22,132	$ 57,236	$ 64,378	$ 69,187
Weighted-average number of common shares outstanding – basic (shares)									31,570,118	30,659,320	27,596,020
Share-based compensation plans (shares)									658,739	1,917,451	2,221,517
Warrants (shares)									4,241	19,906	196,113
Weighted-average number of common shares – diluted (shares)									32,233,098	32,596,677	30,013,650
Basic earnings per common share (usd per share)	$ 0.45	$ 0.08	$ 0.64	$ 0.65	$ 0.58	$ 0.13	$ 0.66	$ 0.73	$ 1.81	$ 2.10	$ 2.51
Diluted earnings per share (usd per share)	$ 0.44	$ 0.07	$ 0.62	$ 0.64	$ 0.55	$ 0.13	$ 0.62	$ 0.67	$ 1.78	$ 1.97	$ 2.31

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