Consolidated Balance Sheets Parentheticals (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investment securities available for sale at amortized cost	$ 728,989	$ 690,556
Preferred Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
Preferred Stock, Shares Authorized	2,000,000	2,000,000
Series B Preferred stock shares issued	401	401
Series B Preferred stock shares outstanding	401	401
Series B Preferred stock liquidation value per share	$ 100,000	$ 100,000
Common Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
Common Stock, Shares Authorized	170,000,000	170,000,000
Common Stock, Shares, Issued	79,053,668	78,743,518
Common Stock, Shares, Outstanding	79,053,668	78,743,518