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
Income (numerator) [Abstract]
Basic earnings per share, Net income available to common shareholders	$ 3,854	$ 660	$ 7,826	$ 3,348
Effect of dilutive securities, Common stock options	0	0	0	0
Diluted earnings per share, Net income available to common shareholders	$ 3,854	$ 660	$ 7,826	$ 3,348
Shares (denominator) [Abstract]
Basic earnings per share, Net income available to common shareholders (in shares)	33,101,281	33,196,281	33,099,303	30,638,325
Effect of dilutive securities, Common stock options (in shares)	46,510	9,460	15,665	7,353
Diluted earnings per share, Net income available to common shareholders (in shares)	33,147,791	33,205,741	33,114,968	30,645,678
Per share amount [Abstract]
Basic earnings per share, Net income available to common shareholders (in dollars per share)	$ 0.12	$ 0.02	$ 0.24	$ 0.11
Effect of dilutive securities, Common stock options (in shares)	$ 0	$ 0	$ 0	$ 0
Diluted earnings per share, Net income available to common shareholders (in dollars per share)	$ 0.12	$ 0.02	$ 0.24	$ 0.11
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Minimum exercisable prices (in dollars per share)	$ 9.58	$ 7.81	$ 9.58	$ 7.81
Maximum exercisable prices (in dollars per share)	$ 25.43	$ 25.43	$ 25.43	$ 25.43
Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock options (in shares)	1,595,241	2,206,115	1,595,241	2,206,115
Stock appreciation rights [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock options (in shares)		60,000		60,000