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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 18,000	$ 4,139	$ 20,107	$ 22,132	$ 16,213	$ 18,655	$ 17,421	$ 16,898	$ 64,378	$ 69,187	$ 56,090
Weighted-average number of common shares outstanding – basic (shares)									30,659,320	27,596,020	26,844,545
Share-based compensation plans (shares)									1,917,451	2,221,517	1,516,297
Warrants (shares)									19,906	196,113	324,097
Weighted-average number of common shares – diluted (shares)									32,596,677	30,013,650	28,684,939
Basic earnings per common share (usd per share)	$ 0.58	$ 0.13	$ 0.66	$ 0.73	$ 0.56	$ 0.68	$ 0.64	$ 0.63	$ 2.10	$ 2.51	$ 2.09
Diluted earnings per share (usd per share)	$ 0.55	$ 0.13	$ 0.62	$ 0.67	$ 0.51	$ 0.63	$ 0.59	$ 0.58	$ 1.97	$ 2.31	$ 1.96

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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