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Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic earnings per share
Net Income	$ 8,171	$ 6,602	$ 25,467	$ 18,309
Less: Preferred stock dividends				42
Net Income Available to Common Shareholders	$ 8,171	$ 6,602	$ 25,467	$ 18,267
Weighted average common shares outstanding	22,580,160	21,538,752	22,326,454	19,252,295
Basic Earnings Per Share	$ 0.36	$ 0.31	$ 1.14	$ 0.95
Diluted earnings per share
Net income available to common shareholders	$ 8,171	$ 6,602	$ 25,467	$ 18,267
Weighted average common shares outstanding	22,580,160	21,538,752	22,326,454	19,252,295
Effect of dilutive securities:
Weighted average shares outstanding	22,715,273	21,651,953	22,455,798	19,346,376
Diluted Earnings Per Share	$ 0.36	$ 0.30	$ 1.13	$ 0.94
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities	36,749	33,650	33,791	27,590
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	98,364	79,551	95,553	66,491

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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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