CONSOLIDATED BALANCE SHEETS [PARENTHETICAL] (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investment securities available for sale, amortized cost (in dollars)	$ 773,856	$ 717,593
Preferred stock, shares authorized	10,000	10,000
Series B Preferred stock, shares issued	121	121
Series B Preferred stock, shares outstanding	121	121
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	19,290	19,298
Common stock, shares outstanding	19,290	19,298