Fair Values Of Assets And Liabilities (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
US Agencies [Member]
Total net gains (losses) included in Net income		[1]
Settlements	7,959	[2]
Issuances
Net transfers into Level 3					7,959	[2]
Ending Balance	7,959				7,959
Municipal Securities [Member]
Beginning Balance	24,525		14,028		16,416		17,152
Total net gains (losses) included in Net income		[1]
Total net gains (losses) included in Other comprehensive income					(748)
Purchases, issuances, sales and settlements, net			1,897				(1,227)
Purchases	6,492				15,630
Sales	(1,871)				(6,655)
Settlements	(2,511)	[2]			(1,230)
Issuances
Net transfers into Level 3					1,992	[2]
Ending Balance	25,405		15,925		25,405		15,925
Corporate Notes And Other [Member]
Beginning Balance	16,313		11,352		9,841		51,194
Total net gains (losses) included in Net income		[1]	(1)	[3]	(274)	[1]	(34)	[3]
Total net gains (losses) included in Other comprehensive income			(834)				1
Purchases, issuances, sales and settlements, net							(40,644)
Purchases	500				7,246
Settlements	(10,712)	[2]			(192)
Issuances
Net transfers into Level 3			(5,025)		(10,712)	[2]	(5,025)
Ending Balance	5,909		5,492		5,909		5,492
Mortgage-Backed [Member]
Beginning Balance	2,684		145,331		2,460		158,449
Total net gains (losses) included in Net income		[1]	(6,947)	[3]	(53)	[1]	(6,947)	[3]
Total net gains (losses) included in Other comprehensive income			2				2,522
Purchases, issuances, sales and settlements, net			(129,499)				(145,871)
Purchases	333				610
Settlements					(65)
Issuances
Net transfers into Level 3			(5,560)				(4,826)
Ending Balance	2,952		3,327		2,952		3,327
Equity Securities [Member]
Beginning Balance	30,891		26,891		28,672		26,800
Total net gains (losses) included in Net income		[1]
Total net gains (losses) included in Other comprehensive income			(825)		419		(825)
Purchases, issuances, sales and settlements, net			2,200				2,291
Purchases					1,800
Issuances
Ending Balance	30,891		28,266		30,891		28,266
Trading Account Securities [Member]
Beginning Balance	172		36,809		4,372		31,924
Total net gains (losses) included in Net income		[1]	(28,688)	[3]			(23,803)	[3]
Purchases, issuances, sales and settlements, net			(4,030)				(4,030)
Sales	(147)				(4,347)
Issuances
Ending Balance	25		4,091		25		4,091
Mortgage Servicing Rights [Member]
Beginning Balance	8,762		5,347		8,762		6,745
Total net gains (losses) included in Net income	(2,022)	[1]	(168)	[3]	(2,022)	[1]	(1,566)	[3]
Issuances
Ending Balance	6,740		5,179		6,740		5,179
Retained Interest [Member]
Beginning Balance							43,541
Purchases, issuances, sales and settlements, net							$ (43,541)

[1] The transfer of U.S. Agency and Municipal securities and Corporate Notes into Level 3 is the result of the use of unobservable inputs that reflect the Company's own assumptions that market participants would use in pricing these securities.

[2] Income for Corporate notes and other debt, and mortgage-backed are recognized as a component of interest income on securities. Additionally, changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.

[3] Income for Corporate notes, other debt and mortgage-backed is recognized as a component of interest income on securities. Income for trading account securities is recognized as a component of trading income in non-interest income and trading account securities interest income. Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.