Loans And Allowance For Credit Losses (Summary Of Past Due Loans (Accruing And Nonaccruing)) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	$ 39,296,627		$ 38,711,947
30-89 days past due	138,546		145,849
90+ days past due	195,190		185,569
Total past due	333,736		331,418
Total loans	39,630,363		39,043,365
Accruing loans 90+ days past due	51,746		40,348
Nonaccrual loans that are current	148,821	[1]	232,055	[1]
LoansReceivableHeldForSaleNet [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	157,062		171,328
30-89 days past due	4,479		0
90+ days past due	2,833		0
Total past due	7,312		0
Total loans	164,374		171,328
Accruing loans 90+ days past due	0		0
Nonaccrual loans that are current	22,141	[1]	0	[1]
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	21,129,249		20,755,625
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	20,948,212		20,573,298
30-89 days past due	95,025		89,009
90+ days past due	86,012		93,318
Total past due	181,037		182,327
Total loans	21,129,249		20,755,625
Accruing loans 90+ days past due	3,682		2,635
Nonaccrual loans that are current	89,880	[1]	136,223	[1]
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	10,308,874		10,188,658
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	7,941,672		7,748,811
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	7,894,513		7,699,595
30-89 days past due	17,478		20,485
90+ days past due	29,681		28,731
Total past due	47,159		49,216
Total loans	7,941,672		7,748,811
Accruing loans 90+ days past due	2,159		1,719
Nonaccrual loans that are current	25,329	[1]	33,922	[1]
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	12,694,068		12,387,546
30-89 days past due	67,955		48,811
90+ days past due	43,280		44,726
Total past due	111,235		93,537
Total loans	12,805,303		12,481,083
Accruing loans 90+ days past due	1,537		1,855
Nonaccrual loans that are current	27,058	[1]	52,412	[1]
Leasing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	414,954		387,526
30-89 days past due	0		173
90+ days past due	251		230
Total past due	251		403
Total loans	415,205		387,929
Accruing loans 90+ days past due	0		36
Nonaccrual loans that are current	417	[1]	563	[1]
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	7,321,609		7,357,618
30-89 days past due	22,324		36,718
90+ days past due	42,481		42,859
Total past due	64,805		79,577
Total loans	7,386,414		7,437,195
Accruing loans 90+ days past due	2,145		744
Nonaccrual loans that are current	58,200	[1]	82,072	[1]
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	517,581		440,608
30-89 days past due	4,746		3,307
90+ days past due	0		5,503
Total past due	4,746		8,810
Total loans	522,327		449,418
Accruing loans 90+ days past due	0		0
Nonaccrual loans that are current	4,205	[1]	1,176	[1]
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	2,328,070		2,162,018
30-89 days past due	296		8,967
90+ days past due	11,883		11,836
Total past due	12,179		20,803
Total loans	2,340,249		2,182,821
Accruing loans 90+ days past due	2,239		23
Nonaccrual loans that are current	13,972	[1]	17,311	[1]
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	7,922,149		7,971,327
30-89 days past due	17,603		15,362
90+ days past due	28,873		19,148
Total past due	46,476		34,510
Total loans	7,968,625		8,005,837
Accruing loans 90+ days past due	5,648		5,580
Nonaccrual loans that are current	18,509	[1]	42,624	[1]
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	10,250,219		10,133,345
30-89 days past due	17,899		24,329
90+ days past due	40,756		30,984
Total past due	58,655		55,313
Total loans	10,308,874		10,188,658
Accruing loans 90+ days past due	7,887		5,603
Nonaccrual loans that are current	32,481	[1]	59,935	[1]
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	2,191,199		2,122,549
30-89 days past due	4,113		8,001
90+ days past due	8,862		2,570
Total past due	12,975		10,571
Total loans	2,204,174		2,133,120
Accruing loans 90+ days past due	0		98
Nonaccrual loans that are current	1,827	[1]	2,868	[1]
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	4,798,122		4,704,852
30-89 days past due	10,523		8,526
90+ days past due	18,422		23,287
Total past due	28,945		31,813
Total loans	4,827,067		4,736,665
Accruing loans 90+ days past due	1,126		667
Nonaccrual loans that are current	21,729	[1]	27,592	[1]
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	336,016		322,807
30-89 days past due	1,049		1,038
90+ days past due	1,105		1,077
Total past due	2,154		2,115
Total loans	338,170		324,922
Accruing loans 90+ days past due	164		0
Nonaccrual loans that are current	1,323	[1]	2,232	[1]
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	374,012		353,060
30-89 days past due	1,273		2,093
90+ days past due	1,081		1,087
Total past due	2,354		3,180
Total loans	376,366		356,240
Accruing loans 90+ days past due	869		900
Nonaccrual loans that are current	337	[1]	1,105	[1]
Consumer Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	195,164		196,327
30-89 days past due	520		827
90+ days past due	211		710
Total past due	731		1,537
Total loans	195,895		197,864
Accruing loans 90+ days past due	0		54
Nonaccrual loans that are current	113	[1]	125	[1]
Fdic Supported Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	203,683		305,709
30-89 days past due	8,144		12,026
90+ days past due	38,741		32,536
Total past due	46,885		44,562
Total loans	250,568		350,271
Accruing loans 90+ days past due	38,018		30,391
Nonaccrual loans that are current	$ 1,131	[1]	$ 1,975	[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.