Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total net gains (losses) included in, Other noninterest expense	$ 58,431	$ 72,673
Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	4,164	10,662
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	2	10
Total net gains (losses) included in, Fixed income securities gains (losses), net	31	16
Total net gains (losses) included in, Other comprehensive income (loss)	127	(274)
Total net gains (losses) included in, Sales
Total net gains (losses) included in, Redemptions and paydowns	(1,859)	(230)
Fair value of assets, Ending balance	2,465	10,184
Banks, Trust and Insurance, Equities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	393,007	1,238,820
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	257	720
Total net gains (losses) included in, Fixed income securities gains (losses), net	(323)	18,582
Total net gains (losses) included in, Other comprehensive income (loss)	(6,949)	94,462
Fair Value of Securities Reclassified from HTM to AFS	57,308
Total net gains (losses) included in, Sales	2,613	546,388
Total net gains (losses) included in, Redemptions and paydowns	(2,349)	(46,786)
Fair value of assets, Ending balance	438,338	690,217
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		69,193
Trust Preferred Securities - Real Estate Investment Trusts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	0	22,996
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale
Total net gains (losses) included in, Fixed income securities gains (losses), net		1,399
Total net gains (losses) included in, Other comprehensive income (loss)
Total net gains (losses) included in, Sales		24,395
Fair value of assets, Ending balance	0	0
Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance		6,599
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale		1
Total net gains (losses) included in, Fixed income securities gains (losses), net
Total net gains (losses) included in, Other comprehensive income (loss)		(40)
Total net gains (losses) included in, Redemptions and paydowns
Fair value of assets, Ending balance		6,560
Other Asset-Backed [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	4,786	25,800
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale
Total net gains (losses) included in, Fixed income securities gains (losses), net		10,917
Total net gains (losses) included in, Other comprehensive income (loss)	42	(15)
Total net gains (losses) included in, Sales		36,669
Total net gains (losses) included in, Redemptions and paydowns	(2)	(3)
Fair value of assets, Ending balance	4,826	30
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	99,865	82,410
Total net gains (losses) included in, Dividends and other investment income	1,074	(1,695)
Total net gains (losses) included in, Equity securities gains, net	3,253
Total net gains (losses) included in, Purchases	5,052	1,356
Total net gains (losses) included in, Sales	(1,517)	(824)
Total net gains (losses) included in, Redemptions and paydowns	(279)	(195)
Fair value of assets, Ending balance	107,448	81,052
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	12,227	8,852
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	4	481
Total net gains (losses) included in, Purchases	171	2,077
Total net gains (losses) included in, Redemptions and paydowns	(401)	(203)
Fair value of liabilities, Ending balance	12,001	11,207
Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	(13)	(4,303)
Derivative, Gain (Loss) on Derivative, Net		(7,427)
Total net gains (losses) included in, Other noninterest expense	13	8
Total net gains (losses) included, in Redemptions and paydowns, Liabilities		(6,090)
Fair value of liabilities, Ending balance	$ 0	$ (5,632)