Net Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Basic net income per share:	$ 10,403	$ 11,236	$ 33,083	$ 34,812
Less: Preferred Stock dividends and discount accretion	(430)	(1,134)	(2,139)	(3,404)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	9,973	10,102	30,944	31,408
Effect of dilutive stock options and warrants
Net income (loss) available to common stockholders	$ 9,973	$ 10,102	$ 30,944	$ 31,408
Net income (loss) available to common stockholders (in shares)	28,806,809	28,649,996	28,769,206	28,619,186
Effect of dilutive stock options and warrants (in shares)	274,663	238,080	257,260	200,097
Net income (loss) available to common stockholders (in shares)	29,081,472	28,888,076	29,026,466	28,819,283
Net income (loss) available to common stockholders (in dollars per share)	$ 0.35	$ 0.35	$ 1.08	$ 1.09
Diluted net income (loss) per share:
Net income (loss) available to common stockholders (in dollars per share)	$ 0.35	$ 0.35	$ 1.07	$ 1.09