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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								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
Basic
Net income to common stockholders	$ 18,085	$ 8,975	$ 12,192	$ 11,878	$ 6,111	$ 9,587	$ 9,467	$ 10,281	$ 51,130	$ 35,446	$ 19,813
Weighted average common shares outstanding									24,791,448	19,133,745	17,856,828
Basic earnings per common share	$ 0.68	$ 0.34	$ 0.48	$ 0.57	$ 0.29	$ 0.48	$ 0.53	$ 0.57	$ 2.06	$ 1.85	$ 1.11
Diluted
Net income to common stockholders	$ 18,085	$ 8,975	$ 12,192	$ 11,878	$ 6,111	$ 9,587	$ 9,467	$ 10,281	$ 51,130	$ 35,446	$ 19,813
Dilutive effect of preferred stock									578	774
Net income to common stockholders - diluted									$ 51,708	$ 36,220	$ 19,813
Weighted average common shares outstanding									24,791,448	19,133,745	17,856,828
Dilutive effects of:
Average shares and dilutive potential common shares									25,480,513	20,000,288	18,053,531
Diluted earnings per common share	$ 0.67	$ 0.34	$ 0.47	$ 0.56	$ 0.29	$ 0.47	$ 0.51	$ 0.55	$ 2.03	$ 1.81	$ 1.10
Stock Options
Dilutive effects of:
Stock based compensation									84,126	45,653	3,128
Restricted Stock Awards
Dilutive effects of:
Stock based compensation									52,851	68,079	110,565
Restricted Stock Units
Dilutive effects of:
Stock based compensation									3,039
Series A Preferred Dividends
Dilutive effects of:
Assumed conversion of shares									258,674	315,773
Series B Preferred Dividends
Dilutive effects of:
Assumed conversion of shares									290,375	354,471
Warrant
Dilutive effects of:
Assumed exercises of stock warrants										82,567	83,010

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

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