Loans And Allowance For Loan Losses (Schedule Of Current, Accruing Past Due And Nonaccrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	$ 18,913,905	$ 19,059,336
Accruing 30-89 Days Past Due	98,014	134,922
Accruing 90 Days or Greater Past Due	6,811	14,520
Total Accruing Past Due	104,825	149,442
Nonaccrual	543,333	883,021
Total loans	19,562,063	20,091,799
Home Equity Lines [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,515,396	1,581,469
Accruing 30-89 Days Past Due	9,555	12,893
Accruing 90 Days or Greater Past Due	705	664
Total Accruing Past Due	10,260	13,557
Nonaccrual	16,741	24,559
Total loans	1,542,397	1,619,585
Consumer Mortgages [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,332,369	1,326,411
Accruing 30-89 Days Past Due	21,961	23,213
Accruing 90 Days or Greater Past Due	1,288	5,130
Total Accruing Past Due	23,249	28,343
Nonaccrual	38,630	56,995
Total loans	1,394,248	1,411,749
Credit Cards [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	258,698	267,511
Accruing 30-89 Days Past Due	2,450	3,113
Accruing 90 Days or Greater Past Due	2,413	2,474
Total Accruing Past Due	4,863	5,587
Nonaccrual	0	0
Total loans	263,561	273,098
Small Business [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	505,526	293,169
Accruing 30-89 Days Past Due	4,935	3,255
Accruing 90 Days or Greater Past Due	338	146
Total Accruing Past Due	5,273	3,401
Nonaccrual	5,550	3,762
Total loans	516,349	300,332
Other Retail Loans [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	287,312	269,537
Accruing 30-89 Days Past Due	3,676	2,977
Accruing 90 Days or Greater Past Due	24	25
Total Accruing Past Due	3,700	3,002
Nonaccrual	3,530	2,604
Total loans	294,542	275,143
Investment Properties [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	4,278,016	4,450,627
Accruing 30-89 Days Past Due	5,436	10,866
Accruing 90 Days or Greater Past Due	798	54
Total Accruing Past Due	6,234	10,920
Nonaccrual	91,868	95,766
Total loans	4,376,118	4,557,313
1-4 Family Properties [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,193,433	1,396,778
Accruing 30-89 Days Past Due	13,053	23,480
Accruing 90 Days or Greater Past Due	41	642
Total Accruing Past Due	13,094	24,122
Nonaccrual	72,578	197,584
Total loans	1,279,105	1,618,484
Land Acquisition [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	599,034	855,021
Accruing 30-89 Days Past Due	3,422	5,299
Accruing 90 Days or Greater Past Due	298	350
Total Accruing Past Due	3,720	5,649
Nonaccrual	191,475	234,151
Total loans	794,229	1,094,821
Commercial Real Estate [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	6,070,483	6,702,426
Accruing 30-89 Days Past Due	21,911	39,645
Accruing 90 Days or Greater Past Due	1,137	1,046
Total Accruing Past Due	23,048	40,691
Nonaccrual	355,921	527,501
Total loans	6,449,452	7,270,618
Commercial And Industrial [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	8,944,121	8,618,813
Accruing 30-89 Days Past Due	33,526	49,826
Accruing 90 Days or Greater Past Due	906	5,035
Total Accruing Past Due	34,432	54,861
Nonaccrual	122,961	267,600
Total loans	9,101,514	8,941,274
Retail [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	3,899,301	3,738,097
Accruing 30-89 Days Past Due	42,577	45,451
Accruing 90 Days or Greater Past Due	4,768	8,439
Total Accruing Past Due	47,345	53,890
Nonaccrual	64,451	87,920
Total loans	$ 4,011,097	$ 3,879,907