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Earnings Per Share - Factors Used in Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic
Net income to common stockholders	$ 8,975	$ 9,587	$ 33,045	$ 29,335
Weighted average common shares outstanding	26,178,194	19,811,577	24,159,543	18,600,009
Basic earnings per common share	$ 0.34	$ 0.48	$ 1.37	$ 1.58
Diluted
Net income to common stockholders	$ 8,975	$ 9,587	$ 33,045	$ 29,335
Dilutive effect of preferred stock	195	195	578	580
Net income to common stockholders - diluted	$ 9,170	$ 9,782	$ 33,623	$ 29,915
Weighted average common shares outstanding	26,178,194	19,811,577	24,159,543	18,600,009
Dilutive effects of:
Average shares and dilutive potential common shares	26,991,830	20,645,469	24,974,308	19,488,425
Diluted earnings per common share	$ 0.34	$ 0.47	$ 1.35	$ 1.53
Stock Options
Dilutive effects of:
Stock based compensation	90,320	45,788	86,728	42,084
Restricted Stock Awards
Dilutive effects of:
Stock based compensation	45,796	63,384	55,087	65,999
Restricted Stock Units
Dilutive effects of:
Stock based compensation	7,276		2,706
Series A Preferred Dividends
Dilutive effects of:
Assumed conversion of shares	315,773	315,773	315,773	315,773
Series B Preferred Dividends
Dilutive effects of:
Assumed conversion of shares	354,471	354,471	354,471	354,471
Warrant
Dilutive effects of:
Assumed exercises of stock warrants		54,476		110,089

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The after-tax amount of any dividends on convertible preferred stock.

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