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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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic
Net income to common stockholders	$ 9,467	$ 4,431	$ 19,748	$ 9,243
Weighted average common shares outstanding	18,012,905	17,859,604	17,984,184	17,838,267
Basic earnings per common share	$ 0.53	$ 0.25	$ 1.10	$ 0.52
Diluted
Net income to common stockholders	$ 9,467	$ 4,431	$ 19,748	$ 9,243
Dilutive effect of preferred stock	193		385
Net income to common stockholders - diluted	$ 9,660	$ 4,431	$ 20,133	$ 9,243
Weighted average common shares outstanding	18,012,905	17,859,604	17,984,184	17,838,267
Average shares and dilutive potential common shares	18,893,158	18,042,585	18,899,865	18,011,931
Diluted earnings per common share	$ 0.51	$ 0.25	$ 1.07	$ 0.51
Restricted Stock
Diluted
Dilutive effects of stock based compensation	47,521	112,880	67,308	113,334
Antidilutive shares	35,270	76,362	35,270	76,362
Stock Options
Diluted
Dilutive effects of stock based compensation	32,592		40,233
Antidilutive shares	58,442	164,175	58,442	164,175
Series A Preferred Dividends
Diluted
Dilutive effects of assumed conversion of shares	315,773		315,773
Antidilutive shares		315,773		315,773
Series B Preferred Dividends
Diluted
Dilutive effects of assumed conversion of shares	354,471		354,471
Antidilutive shares		360,578		360,578
Warrant
Diluted
Dilutive effects of assumed exercises of stock warrants	129,896	70,101	137,896	60,330

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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

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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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