Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Market value on securities held-to-maturity (in Dollars)	$ 908,067	$ 1,203,977
Amortized cost on securities available-for-sale (in Dollars)	$ 1,290,212	$ 1,309,521
Preferred stock shares authorized (in Shares)	10,000,000	10,000,000
Preferred stock shares issued (in Shares)	258,000	258,000
Preferred stock shares outstanding (in Shares)	258,000	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)	82,951,885	82,860,122
Common stock shares outstanding (in Shares)	78,744,320	78,652,557
Treasury stock shares (in Shares)	4,207,565	4,207,565