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, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Municipal [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 24,211		$ 16,416
Total net gains (losses) included in Other comprehensive income	2
Purchases	3,840		3,957
Sales			(4,779)
Settlements	(116)
Net transfers into/(out of) Level 3	(2,402)	[1]
Ending Balance	25,535		15,594
Corporate Notes And Other [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			9,841
Total net gains (losses) included in Net income			(128)	[2]
Ending Balance			9,713
Mortgage-Backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			2,460
Total net gains (losses) included in Net income			(14)	[2]
Purchases			277
Ending Balance			2,723
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	18,971		28,672
Total net gains (losses) included in Other comprehensive income	2,253		73
Ending Balance	21,224		28,745
Trading Account Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			4,372
Sales			(3,732)
Ending Balance			640
Mortgage Servicing Rights [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	6,700		8,762
Total net gains (losses) included in Net income	501	[3]	686	[2]
Ending Balance	$ 7,201		$ 9,448

[1] During the first quarter of 2012, one municipal security was transferred out of Level 3 into Level 2 as observable market information was available that market participants would use in pricing these securities. Transfers out of Level 3 are recognized at the end of the reporting period.

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

[3] Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.