Fair Value Disclosures (Assets Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 17,532	$ 16,085	$ 15,884	$ 39,476
Adjustments relating to the consolidation of variable interest entities				(19,951)
Other-than-temporary impairment		(240)		(797)	[1]
Included in other comprehensive income (before taxes)	(1,362)	647	286	(2,236)
Ending balance	16,170	16,492	16,170	16,492
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	3,399	3,556	3,381	4,081
Other-than-temporary impairment		(240)		(240)	[1]
Included in other comprehensive income (before taxes)	31	240	49	(285)
Ending balance	3,430	3,556	3,430	3,556
Synthetic Collateralized Debt Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		1,576		1,331
Other-than-temporary impairment		0		(557)	[1]
Included in other comprehensive income (before taxes)		(353)		449
Ending balance		1,223		1,223
Other Structured Financial Products [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	14,133	10,953	12,503	14,113
Other-than-temporary impairment		0
Included in other comprehensive income (before taxes)	(1,393)	760	237	(2,400)
Ending balance	12,740	11,713	12,740	11,713
Non-Agency Residential Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance				2,111
Adjustments relating to the consolidation of variable interest entities				(2,111)
Ending balance		0		0
Interest-Only Strips [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance				17,840
Adjustments relating to the consolidation of variable interest entities				(17,840)
Ending balance		$ 0		$ 0

[1] Included in noninterest income, net impairment losses recognized in earnings.