Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Loan loss allowance, due to differences in computation of bad debts	$ 109,686	$ 122,691
Write-down on equity securities	3,609	3,714
Stock option compensation expense	16,048	15,748
State tax	3,744	1,903
Non-accrual interest	2,048	4,004
Write-down on other real estate owned	14,148	16,374
Unrealized loss on interest rate swaps	1,097	2,709
Unrealized loss on securities available-for-sale, net	6,311	741
Other, net	3,536	3,079
Gross deferred tax assets	160,227	170,963
Core deposit intangibles	(3,919)	(6,282)
Investment in aircraft financing trust and venture capital partnerships	(21,628)	(21,329)
Dividends on Federal Home Loan Bank common stock	(2,788)	(4,035)
Other, net	(5,646)	(4,876)
Gross deferred tax liabilities	(33,981)	(36,522)
Valuation allowance	(2,533)	(2,533)
Net deferred tax assets	$ 123,713	$ 131,908