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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total net gains (losses) included in, Other noninterest expense	$ 66,959	$ 78,116	$ 139,669	$ 156,213
Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	10,184	17,043	10,662	16,551
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	8	0	18	21
Total net gains (losses) included in, Fixed income securities gains (losses), net	0	15	16	36
Total net gains (losses) included in, Other comprehensive income (loss)	92	197	(182)	922
Total net gains (losses) included in, Sales
Total net gains (losses) included in, Redemptions and paydowns	(246)	(3,711)	(476)	3,986
Fair value of assets, Ending balance	10,038	13,544	10,038	13,544
Trust Preferred - Banks And Insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	690,217	1,003,102	1,238,820	949,271
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	633	797	1,353	1,612
Total net gains (losses) included in, Fixed income securities gains (losses), net	4,383	(1,190)	22,965	2,036
Total net gains (losses) included in, Net impairment losses on investment securities		(4,047)	0	(13,761)
Total net gains (losses) included in, Other comprehensive income (loss)	6,878	52,312	101,340	130,962
Total net gains (losses) included in, Sales	0	7,015	546,388	7,015
Total net gains (losses) included in, Redemptions and paydowns	(16,306)	(13,666)	(63,092)	32,812
Fair value of assets, Ending balance	685,805	1,030,293	685,805	1,030,293
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0		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	17,306	22,996	16,403
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale		63	0	126
Total net gains (losses) included in, Fixed income securities gains (losses), net	0		1,399
Total net gains (losses) included in, Net impairment losses on investment securities		(170)	0	(170)
Total net gains (losses) included in, Other comprehensive income (loss)		1,300	0	2,140
Total net gains (losses) included in, Sales	0
Total net gains (losses) included in, Redemptions and paydowns			24,395
Fair value of assets, Ending balance	0	18,499	0	18,499
Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	6,560	6,524	6,599	6,515
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale	1	0	2	1
Total net gains (losses) included in, Fixed income securities gains (losses), net				0
Total net gains (losses) included in, Other comprehensive income (loss)	17	30	(23)	38
Total net gains (losses) included in, Redemptions and paydowns				0
Fair value of assets, Ending balance	6,578	6,554	6,578	6,554
Other Asset-Backed [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	30	15,393	25,800	15,160
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale		9	0	14
Total net gains (losses) included in, Fixed income securities gains (losses), net	0	14	10,917	44
Total net gains (losses) included in, Net impairment losses on investment securities			0
Total net gains (losses) included in, Other comprehensive income (loss)	0	1,972	(15)	4,623
Total net gains (losses) included in, Sales	0		36,669
Total net gains (losses) included in, Redemptions and paydowns	(2)	(64)	(5)	2,517
Fair value of assets, Ending balance	28	17,324	28	17,324
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	81,052	69,706	82,410	64,223
Total net gains (losses) included in, Dividends and other investment income	(1,052)	2,160	(2,747)	5,149
Total net gains (losses) included in, Equity securities gains, net	584	1,340	584	3,739
Total net gains (losses) included in, Purchases	7,104	2,882	8,460	3,841
Total net gains (losses) included in, Sales	(15)	(387)	(839)	1,120
Total net gains (losses) included in, Redemptions and paydowns	(5,417)	(184)	(5,612)	315
Fair value of assets, Ending balance	82,256	75,517	82,256	75,517
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	11,207	8,252	8,852	(8,334)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	45	384	526	503
Total net gains (losses) included in, Purchases	379		2,456
Total net gains (losses) included in, Redemptions and paydowns	(170)	(298)	(373)	499
Fair value of liabilities, Ending balance	11,461	8,338	11,461	8,338
Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities, Beginning balance	(5,632)	(5,070)	(4,303)	5,251
Derivative, Gain (Loss) on Derivative, Net	(467)	(5,450)	(7,894)	(11,008)
Total net gains (losses) included in, Other noninterest expense	101	(94)	109	(165)
Total net gains (losses) included, in Redemptions and paydowns, Liabilities	5,866	(5,496)	(11,956)	(11,306)
Fair value of liabilities, Ending balance	$ (132)	$ (5,118)	$ (132)	$ (5,118)