Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheets
Available for sale securities, pledged	$ 420,348,000	$ 429,439,000
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 5	$ 5
Common stock, shares Authorized	100,000,000	100,000,000
Common stock, shares issued	87,296,284	86,788,322
Treasury stock, shares	2,504,467	61,839