Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income per share calculations for basic and diluted methods
Net income available to common stockholders (in dollars)	$ 8,004	$ 6,532	$ 15,709	$ 12,057
Shares:
Weighted average common shares outstanding	86,895,000	86,730,000	86,880,000	86,717,000
Dilutive effect of outstanding options, warrants and restricted stock units as determined by the application of the treasury stock method (in shares)	368,000		365,000
Weighted average common shares outstanding, as adjusted for diluted earnings per share calculation	87,263,000	86,730,000	87,245,000	86,717,000
Basic earnings per common share (in dollars per share)	$ 0.09	$ 0.08	$ 0.18	$ 0.14
Diluted earnings per common share (in dollars per share)	$ 0.09	$ 0.08	$ 0.18	$ 0.14
Stock options
Anti-dilutive securities excluded from the calculation of common stock equivalents
Number of anti-dilutive securities (in shares)			476,230	701,029
Warrants
Anti-dilutive securities excluded from the calculation of common stock equivalents
Number of anti-dilutive securities (in shares)			573,833	573,833
Restricted stock units
Anti-dilutive securities excluded from the calculation of common stock equivalents
Number of anti-dilutive securities (in shares)			353,976	713,450