Consolidated Balance Sheets Parentheticals (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investment securities available for sale at amortized cost	$ 681,070	$ 694,832
Investment securities held to maturity at fair value	$ 139,679	$ 110,917
Preferred Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
Preferred Stock, Shares Authorized	2,000,000	2,000,000
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	80,394,009	79,837,612
Common Stock, Shares, Outstanding	80,394,009	79,837,612
Series D Preferred Stock [Member]
Preferred Stock, Shares Issued	50,000	50,000
Preferred Stock, Shares Outstanding	50,000	50,000
Preferred Stock, Liquidation Preference Per Share	$ 1,000	$ 1,000