Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Consolidated Balance Sheets [Abstract]
Securities held to maturity, fair values	$ 8,477	$ 8,668	$ 8,735
Preferred stock, liquidation value	$ 1,000	$ 1,000	$ 1,000
Preferred stock, shares authorized	5,000,000	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0	100,000
Common stock, par value	$ 2	$ 2	$ 2
Common stock, shares authorized	400,000,000	400,000,000	400,000,000
Common stock, issued	130,115,580	129,965,635	129,794,795
Treasury stock, at cost	5,096	0	0
Accumulated other comprehensive loss, tax	$ 19,221	$ 32,526	$ 17,983