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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, 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
Basic
Net income to common stockholders	$ 6,111	$ 9,587	$ 9,467	$ 10,281	$ 6,064	$ 4,506	$ 4,431	$ 4,812	$ 35,446	$ 19,813	$ 28,353
Weighted average common shares outstanding									19,133,745	17,856,828	17,720,479
Basic earnings per common share	$ 0.29	$ 0.48	$ 0.53	$ 0.57	$ 0.34	$ 0.25	$ 0.25	$ 0.27	$ 1.85	$ 1.11	$ 1.60
Diluted
Net income to common stockholders	$ 6,111	$ 9,587	$ 9,467	$ 10,281	$ 6,064	$ 4,506	$ 4,431	$ 4,812	$ 35,446	$ 19,813	$ 28,353
Dilutive effect of preferred stock									774		780
Net income to common stockholders - diluted									$ 36,220	$ 19,813	$ 29,133
Weighted average common shares outstanding									19,133,745	17,856,828	17,720,479
Dilutive effects of:
Average shares and dilutive potential common shares									20,000,288	18,053,531	18,524,889
Diluted earnings per common share	$ 0.29	$ 0.47	$ 0.51	$ 0.55	$ 0.33	$ 0.25	$ 0.25	$ 0.27	$ 1.81	$ 1.10	$ 1.57
Restricted Stock
Dilutive effects of:
Stock based compensation									68,079	110,565	79,821
Stock Options
Dilutive effects of:
Stock based compensation									45,653	3,128
Antidilutive shares									57,926
Series A Preferred Dividends
Dilutive effects of:
Assumed conversion of shares									315,773		315,773
Antidilutive shares										315,773
Series B Preferred Dividends
Dilutive effects of:
Assumed conversion of shares									354,471		360,578
Antidilutive shares										360,578
Warrant
Dilutive effects of:
Assumed exercises of stock warrants									82,567	83,010	48,238