Premises And Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Premises And Equipment [Abstract]
Land	$ 103,359,000	$ 93,616,000
Buildings	248,232,000	244,088,000
Furniture and equipment	196,681,000	196,234,000
Leasehold improvements	56,531,000	54,221,000
Construction in progress	4,269,000	7,605,000
Premises and equipment, Gross	609,072,000	595,764,000
Less accumulated depreciation and amortization	(290,030,000)	(278,855,000)
Total premises and equipment, net	319,042,000	316,909,000
Depreciation and amortization of premises and equipment, year to date	$ 21,800,000	$ 22,200,000	$ 21,700,000