Basic and Diluted Earnings (Loss) Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Basic:
Net income available to common shareholders	$ 2,017	$ (3,272)	$ 3,124	$ (3,271)
Average basic shares outstanding	93,973,256	93,667,231	93,960,270	93,642,680
Basic earnings per share	$ 0.02	$ (0.03)	$ 0.03	$ (0.03)
Diluted:
Net income available to common shareholders	$ 2,017	$ (3,272)	$ 3,124	$ (3,271)
Average basic shares outstanding	93,973,256	93,667,231	93,960,270	93,642,680
Employee restricted stock	709,145	785,086	694,124	780,931
Average diluted shares outstanding	94,682,401	94,452,317	94,654,394	94,423,611
Diluted earnings per share	$ 0.02	$ (0.03)	$ 0.03	$ (0.03)