Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Pledged securities that can be sold or repledged	$ 1,826,216	$ 1,826,011
Investment securities, available for sale, amortized cost	5,091,116	6,312,423
Investment securities, held to maturity, fair value	1,074,771	1,012,562
Other, fair value	$ 318,801	$ 366,886
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	381,500	381,500
Preferred stock, shares outstanding	50,000	50,000
Preferred stock, liquidation preference per share	$ 1,000	$ 1,000
Liquidation preference, per share	$ 10,000	$ 10,000
Common stock, par value	$ 0.50	$ 0.50
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	127,403,420	125,683,398
Common stock issuable, shares	57,316	68,220