Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Market value on securities held-to-maturity (in Dollars)	$ 823,906	$ 823,906
Amortized cost on securities available-for-sale (in Dollars)	$ 2,149,786	$ 1,290,676
Preferred stock shares authorized (in Shares)	10,000,000	10,000,000
Preferred stock shares issued (in Shares)	129,000	258,000
Preferred stock shares outstanding (in Shares)	129,000	258,000
Common stock par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock shares authorized (in Shares)	100,000,000	100,000,000
Common stock shares issued (in Shares)	83,066,773	82,985,853
Common stock shares outstanding (in Shares)	78,859,208	78,778,288
Treasury stock shares (in Shares)	4,207,565	4,207,565