CONSOLIDATED BALANCE SHEETS [PARENTHETICAL] (USD $) In Thousands, except Per Share data	Jun. 30, 2011	Dec. 31, 2010
Investment securities available for sale, amortized cost (in dollars)	$ 755,035	$ 645,246
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	19,316	19,286
Common stock, shares outstanding	19,316	19,286
Series B Preferred Stock
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	10,000	10,000
Series B Preferred stock, shares issued	121	121
Series B Preferred stock, shares outstanding	121	121