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, 2014	Mar. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total net gains (losses) included in, Other noninterest expense	$ 72,710	$ 78,097
Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	10,662	16,551
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	10	21
Total net gains (losses) included in, Fixed income securities gains (losses), net	16	21
Total net gains (losses) included in, Other comprehensive income (loss)	(274)	725
Total net gains (losses) included in, Redemptions and paydowns	(230)	(275)
Fair value of assets, Ending balance	10,184	17,043
Trust Preferred - Banks And Insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	1,238,820	949,271
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	720	815
Total net gains (losses) included in, Fixed income securities gains (losses), net	18,582	3,226
Total net gains (losses) included in, Net impairment losses on investment securities		(9,714)
Total net gains (losses) included in, Other comprehensive income (loss)	94,462	78,650
Total net gains (losses) included in, Sales	546,388
Total net gains (losses) included in, Redemptions and paydowns	(46,786)	(19,146)
Fair value of assets, Ending balance	690,217	1,003,102
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	22,996	16,403
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale		63
Total net gains (losses) included in, Fixed income securities gains (losses), net	1,399
Total net gains (losses) included in, Other comprehensive income (loss)		840
Total net gains (losses) included in, Sales	24,395
Fair value of assets, Ending balance	0	17,306
Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	6,599	6,515
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	1	1
Total net gains (losses) included in, Fixed income securities gains (losses), net
Total net gains (losses) included in, Other comprehensive income (loss)	(40)	8
Total net gains (losses) included in, Redemptions and paydowns
Fair value of assets, Ending balance	6,560	6,524
Other Asset-Backed [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	25,800	15,160
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale		5
Total net gains (losses) included in, Fixed income securities gains (losses), net	10,917	30
Total net gains (losses) included in, Net impairment losses on investment securities
Total net gains (losses) included in, Other comprehensive income (loss)	(15)	2,651
Total net gains (losses) included in, Sales	36,669
Total net gains (losses) included in, Redemptions and paydowns	(3)	(2,453)
Fair value of assets, Ending balance	30	15,393
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	82,410	64,223
Total net gains (losses) included in, Dividends and other investment income	(1,695)	2,989
Total net gains (losses) included in, Equity securities gains, net		2,399
Total net gains (losses) included in, Purchases	1,356	959
Total net gains (losses) included in, Sales	(824)	(733)
Total net gains (losses) included in, Redemptions and paydowns	(195)	(131)
Fair value of assets, Ending balance	81,052	69,706
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	8,852	8,334
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	481	119
Total net gains (losses) included in, Purchases	2,077
Total net gains (losses) included in, Redemptions and paydowns	(203)	(201)
Fair value of liabilities, Ending balance	11,207	8,252
Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	(4,303)	(5,251)
Derivative, Gain (Loss) on Derivative, Net	(7,427)	(5,558)
Total net gains (losses) included in, Other noninterest expense	8	(71)
Total net gains (losses) included, in Redemptions and paydowns, Liabilities	6,090	(5,810)
Fair value of liabilities, Ending balance	$ (5,632)	$ (5,070)