Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Securities available for sale at fair value, pledged (in Dollars)	$ 164,695	$ 174,240
Securities held to maturity, pledged (in Dollars)	151,220	136,109
Securities held to maturity, fair value (in Dollars)	$ 385,499	$ 403,218
Common stock par value (in Dollars per share)	$ 1	$ 1
Common stock, shares authorized (in Shares)	100,000,000	100,000,000
Common stock, shares issued (in Shares)	35,263,768	35,263,768
Common shares in treasury at cost, shares (in Shares)	4,309,663	4,307,972