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Earnings Per Share - Factors Used in Computation of Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basic
Net income to common stockholders	$ 2,021	$ 9,495	$ 2,285	$ 3,148	$ 11,318	$ 236	$ 582	$ (297)	$ 16,949	$ 11,839	$ 10,081
Weighted average common shares outstanding									10,940,083	8,481,137	4,502,595
Basic earnings per common share	$ 0.14us-gaap_EarningsPerShareBasic	$ 0.96us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.32us-gaap_EarningsPerShareBasic	$ 1.17us-gaap_EarningsPerShareBasic	$ 0.03us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ (0.04)us-gaap_EarningsPerShareBasic	$ 1.55us-gaap_EarningsPerShareBasic	$ 1.40us-gaap_EarningsPerShareBasic	$ 2.24us-gaap_EarningsPerShareBasic
Diluted
Net income to common stockholders	2,021	9,495	2,285	3,148	11,318	236	582	(297)	16,949	11,839	10,081
Dilutive effect of preferred stock									780	167
Net income to common stockholders - diluted									$ 17,729	$ 12,006	$ 10,081
Weighted average common shares outstanding									10,940,083	8,481,137	4,502,595
Average shares and dilutive potential common shares									11,672,780	8,629,611	4,502,595
Dilutive earnings per common share	$ 0.14us-gaap_EarningsPerShareDiluted	$ 0.91us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 1.12us-gaap_EarningsPerShareDiluted	$ 0.03us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ (0.04)us-gaap_EarningsPerShareDiluted	$ 1.52us-gaap_EarningsPerShareDiluted	$ 1.39us-gaap_EarningsPerShareDiluted	$ 2.24us-gaap_EarningsPerShareDiluted
Preferred Stock - Series A
Diluted
Dilutive effects of assumed conversion of shares									315,773	66,930
Series B Preferred Stock
Diluted
Dilutive effects of assumed conversion of shares									360,578	76,427
Restricted Stock Units (RSUs)
Diluted
Dilutive effects of shares									15,366	5,117
Warrant
Diluted
Dilutive effects of shares									40,980
Antidilutive shares										259,067	259,067