Condensed Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Market value on securities held-to-maturity (in Dollars)	$ 1,131,524	$ 1,203,977
Amortized cost on securities available-for-sale (in Dollars)	$ 1,361,571	$ 1,309,521
Preferred stock shares authorized	10,000,000	10,000,000
Preferred stock shares issued	258,000	258,000
Preferred stock shares outstanding	258,000	258,000
Common stock par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock shares authorized	100,000,000	100,000,000
Common stock shares issued	82,915,962	82,860,122
Common stock shares outstanding	78,708,397	78,652,557
Treasury stock shares	4,207,565	4,207,565