Earnings per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Schedule of computation of basic and diluted earnings per share
Net income (loss)	$ 8,367	$ 3,196	$ 13,817	$ 7,533
Preferred stockholder dividends paid		(704)		(1,408)
Allocation of earnings to preferred stockholders		(449)	(64)	(1,103)
Net Income (Loss) Attributable to Common Stockholders	$ 8,367	$ 2,043	$ 13,753	$ 5,022
Weighted-average number of shares outstanding	7,763,000	6,238,000	7,615,000	6,238,000
Plus: Incremental shares from assumed conversion of dilutive instruments	318,000	649,000	408,000	660,000
Adjusted weighted-average number of shares outstanding	8,081,000	6,887,000	8,023,000	6,898,000
Earnings per share - Basic	$ 1.08	$ 0.33	$ 1.81	$ 0.81
Earnings per share - Diluted	$ 1.04	$ 0.30	$ 1.71	$ 0.73
Earnings per Share (Textual) [Abstract]
Antidilutive shares excluded from calculation of weighted-average shares for diluted EPS	0	0	0	0