Loans And Allowance For Credit Losses (Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans) (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		$ 286,989	$ 286,189
Financing Receivable, Recorded Investment, Current		41,131,196	40,363,353
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		149,270	147,980
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		137,719	138,209
Loans and Leases Receivable, Gross		41,418,185	40,649,542
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		37,202	32,024
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	392,322	217,427
Commercial		55,997	72,440
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Commercial Real Estate		60,456	65,167
Consumer		9,961	11,082
Outstanding balance		126,414	148,689
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net		106,320	125,029
ALLL		357	945
Carrying amount, net		105,963	124,084
Commercial and Industrial Sector [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		126,132	97,436
Financing Receivable, Recorded Investment, Current		13,464,106	13,114,045
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		90,610	60,523
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		35,522	36,913
Loans and Leases Receivable, Gross		13,590,238	13,211,481
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		4,388	3,065
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	287,662	117,942
Finance Leases Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		553	703
Financing Receivable, Recorded Investment, Current		436,597	440,963
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		59	183
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		494	520
Loans and Leases Receivable, Gross		437,150	441,666
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	13,613	3,309
Owner Occupied [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		57,347	64,942
Financing Receivable, Recorded Investment, Current		6,965,082	7,085,086
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		21,987	37,776
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		35,360	27,166
Loans and Leases Receivable, Gross		7,022,429	7,150,028
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		13,350	3,626
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	46,289	43,984
Municipal [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		0	7,632
Financing Receivable, Recorded Investment, Current		695,436	668,207
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0	7,586
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0	46
Loans and Leases Receivable, Gross		695,436	675,839
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	46
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	926	951
Commercial Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		184,032	170,713
Financing Receivable, Recorded Investment, Current		21,561,221	21,308,301
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		112,656	106,068
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		71,376	64,645
Loans and Leases Receivable, Gross		21,745,253	21,479,014
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		17,738	6,737
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	348,490	166,186
Commercial Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		7,140	6,142
Financing Receivable, Recorded Investment, Current		1,960,562	1,835,360
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		2,573	842
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		4,567	5,300
Loans and Leases Receivable, Gross		1,967,702	1,841,502
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1,533	1,745
Term [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		44,074	45,011
Financing Receivable, Recorded Investment, Current		8,782,301	8,469,390
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		10,173	10,424
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		33,901	34,587
Loans and Leases Receivable, Gross		8,826,375	8,514,401
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		18,295	21,697
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	15,791	24,867
Commercial Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		51,214	51,153
Financing Receivable, Recorded Investment, Current		10,742,863	10,304,750
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		12,746	11,266
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		38,468	39,887
Loans and Leases Receivable, Gross		10,794,077	10,355,903
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		18,295	21,697
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	17,324	26,612
Home Equity Line of Credit [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		12,268	8,385
Financing Receivable, Recorded Investment, Current		2,420,364	2,407,972
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		7,015	4,717
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		5,253	3,668
Loans and Leases Receivable, Gross		2,432,632	2,416,357
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	4,604	3,053
One Through Four Family Residential [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		31,723	41,550
Financing Receivable, Recorded Investment, Current		5,386,087	5,340,549
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		10,617	14,828
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		21,106	26,722
Loans and Leases Receivable, Gross		5,417,810	5,382,099
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		321	1,036
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	20,131	20,939
Construction And Other Consumer Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		3,613	10,253
Financing Receivable, Recorded Investment, Current		397,809	374,987
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3,365	8,593
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		248	1,660
Loans and Leases Receivable, Gross		401,422	385,240
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	1,337
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	355	408
Revolving Credit Facility [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		3,448	3,422
Financing Receivable, Recorded Investment, Current		435,092	440,358
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		2,241	1,861
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		1,207	1,561
Loans and Leases Receivable, Gross		438,540	443,780
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		848	1,217
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1,340	146
Consumer Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		691	713
Financing Receivable, Recorded Investment, Current		187,760	186,436
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		630	647
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		61	66
Loans and Leases Receivable, Gross		188,451	187,149
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	78	83
Consumer Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		51,743	64,323
Financing Receivable, Recorded Investment, Current		8,827,112	8,750,302
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		23,868	30,646
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		27,875	33,677
Loans and Leases Receivable, Gross		8,878,855	8,814,625
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1,169	3,590
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 26,508	$ 24,629

[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.