Earnings per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Net Income	$ 14,591	$ 11,899	$ 26,767	$ 20,801
Earnings allocated to participating securities - nonvested restricted shares	124	122	244	223
Earnings allocated to participating securities - preferred shares	29	0	30	0
Earnings allocated to common shareholders, Basic	14,438	11,777	26,493	20,578
Weighted average common shares outstanding	50,788	39,260	45,099	39,228
Basic earnings per common share	$ 0.28	$ 0.30	$ 0.59	$ 0.52
Dilutive effect of equity awards and warrants	1,337	48	659	78
Earnings allocated to common shareholders, Diluted	$ 14,441	$ 11,777	$ 26,495	$ 20,578
Weighted average diluted common shares outstanding	52,125	39,308	45,758	39,306
Diluted earnings per common share	$ 0.28	$ 0.30	$ 0.58	$ 0.52
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	143	46	76	46