Condensed Financial Information - Parent Company Only Income statement (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Condensed Financial Statements, Captions [Line Items]
Total Other Income	$ 187,727	$ 182,320	$ 173,935
Income Before Income Taxes	196,411	172,741	89,332
Income tax benefit	50,838	44,409	15,408
Net Income	145,573	128,332	73,924
Preferred Stock dividends and discount accretion	0	(16,303)	(20,169)
Net Income Available to Common Shareholders	145,573	112,029	53,755
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries	91,325	63,850	157,900
Other	78,662	73,438	70,775
Total Other Income	169,987	137,288	228,675
Expenses	112,398	105,012	99,526
Income Before Income Taxes	57,589	32,276	129,149
Income tax benefit	(11,523)	(11,180)	(10,354)
Income (Loss) from Continuing Operations Attributable to Parent	69,112	43,456	139,503
Bank subsidiaries	80,908	78,146	18,596
Non-bank subsidiaries	(4,447)	6,730	(84,175)
Net Income	145,573	128,332	73,924
Preferred Stock dividends and discount accretion	0	(16,303)	(20,169)
Net Income Available to Common Shareholders	$ 145,573	$ 112,029	$ 53,755