Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income (numerator) [Abstract]
Basic earnings per share, Net income available to common shareholders	$ 3,561	$ 2,282	$ 11,387	$ 5,630
Effect of dilutive securities, Common stock options	0	0	0	0
Diluted earnings per share, Net income available to common shareholders	$ 3,561	$ 2,282	$ 11,387	$ 5,630
Shares (denominator) [Abstract]
Basic earnings per share, Net income available to common shareholders (in shares)	33,105,194	33,196,281	33,101,281	31,500,347
Effect of dilutive securities, Common stock options (in shares)	67,658	7,381	32,026	6,461
Diluted earnings per share, Net income available to common shareholders (in shares)	33,172,852	33,203,662	33,133,307	31,506,808
Per share amount [Abstract]
Basic earnings per share, Net income available to common shareholders (in dollars per share)	$ 0.11	$ 0.07	$ 0.34	$ 0.18
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)	$ 0.11	$ 0.07	$ 0.34	$ 0.18
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Minimum exercisable prices (in dollars per share)	$ 9.58	$ 7.36	$ 9.58	$ 7.36
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)	1,528,367	2,766,115	1,528,367	2,766,115
Stock appreciation rights [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock options (in shares)		60,000		60,000