CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Investment securities held to maturity - fair value	$ 551,621	$ 560,847
Loans - allowance for loan losses	$ 69,583	$ 67,870
Common Stock, stated value (in dollars per share)	$ 0.125	$ 0.125
Common Stock, Authorized (in shares)	50,000,000	50,000,000
Common Stock, Issued (in shares)	36,014,083	35,921,761
Common Stock, Outstanding (in shares)	36,014,083	35,921,761
Cumulative Preferred Stock
Preferred Stock, par value (in dollars per share)	$ 1,000	$ 1,000
Preferred Stock, liquidation value per share (in dollars per share)	$ 1,000	$ 1,000
Preferred Stock, Authorized (in shares)	600	600
Preferred Stock, Issued (in shares)	125	125
Preferred Stock, Outstanding (in shares)	125	125