5. 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
Earnings per common share
Net income	$ 5,560	$ 4,219	$ 15,942	$ 11,116
Preferred stock dividends and accretion	0	(296)	0	(1,482)
Net income available to common shareholders	$ 5,560	$ 3,923	$ 15,942	$ 9,634
Weighted average common shares issued and outstanding	23,104,631	22,869,271	23,086,118	22,853,560
Earnings per common share	$ 0.24	$ 0.17	$ 0.69	$ 0.42
Diluted earnings per common share
Weighted average common shares issued and outstanding	23,104,631	22,869,271	23,086,118	22,853,560
Stock options	918	227	347	2,846
Total diluted weighted average common shares issued and outstanding	23,105,549	22,869,498	23,086,465	22,856,406
Diluted earnings per common share	$ 0.24	$ 0.17	$ 0.69	$ 0.42