CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Investment securities held to maturity, fair value	$ 427,633	$ 442,469
Loans, allowance for loan losses	$ 70,369	$ 70,898
Common Stock, stated value	$ 0.125	$ 0.125
Common Stock, Authorized	50,000,000	50,000,000
Common Stock, shares Issued	28,622,586	28,559,707
Common Stock, shares outstanding	28,622,586	28,559,707
Preferred stock
Preferred Stock, no-par value
Preferred Stock, liquidation value	$ 1,000	$ 1,000
Preferred Stock, Authorized	500,000	500,000
Senior Non-Cumulative Perpetual Preferred Stock
Preferred Stock, Issued	90,783	90,783
Preferred Stock, outstanding	90,783	90,783
Cumulative Preferred Stock
Preferred Stock, par value	$ 1,000	$ 1,000
Preferred Stock, liquidation value	$ 1,000	$ 1,000
Preferred Stock, Authorized	600	600
Preferred Stock, Issued	125	125
Preferred Stock, outstanding	125	125