Loans and Allowances for Credit Losses Part 3 (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Recorded Investment [Abstract]
Financing Receivable Internally Graded	$ 9,363,641	$ 8,889,752
Financing Receivable Non - Graded	1,906,102	1,753,284
Total	11,269,743	10,643,036
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	160,086	211,205
Allowance For Financing Receivable Non- Graded	47,045	55,030
Allowance For Financing Receivable Total	253,481	292,971	292,095	273,236
Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	9,026,605	8,511,297
Financing Receivable Non - Graded	1,881,305	1,724,973
Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	160,547	175,952
Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	176,489	202,503
Financing Receivable Non - Graded	24,797	28,311
Commercial Loan [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	6,552,986	5,914,178
Financing Receivable Non - Graded	18,468	19,818
Total	6,571,454	5,933,996
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	82,263	102,259
Allowance For Financing Receivable Non- Graded	1,180	2,372
Allowance For Financing Receivable Total	83,443	104,631
Commercial Loan [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	6,410,746	5,783,471
Financing Receivable Non - Graded	18,416	19,685
Commercial Loan [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	73,481	92,385
Commercial Loan [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	68,759	38,322
Financing Receivable Non - Graded	52	133
Commercial Loan [Member] | Commercial Energy Financing Receivable [Member]
Recorded Investment [Abstract]
Total	2,015,619	1,711,409
Commercial Loan [Member] | Commercial Energy Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	2,013,866	1,704,401
Financing Receivable Non - Graded	0
Commercial Loan [Member] | Commercial Energy Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	1,417	6,543
Commercial Loan [Member] | Commercial Energy Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	336	465
Financing Receivable Non - Graded	0
Commercial Loan [Member] | Commercial Services Financing Receivable [Member]
Recorded Investment [Abstract]
Total	1,745,189	1,580,921
Commercial Loan [Member] | Commercial Services Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	1,696,883	1,531,239
Financing Receivable Non - Graded	0
Commercial Loan [Member] | Commercial Services Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	31,338	30,420
Commercial Loan [Member] | Commercial Services Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	16,968	19,262
Financing Receivable Non - Graded	0
Commercial Loan [Member] | Commercial Wholesale Retail Financing Receivables [Member]
Recorded Investment [Abstract]
Total	962,984	1,010,246
Commercial Loan [Member] | Commercial Wholesale Retail Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	907,648	956,397
Financing Receivable Non - Graded	0
Commercial Loan [Member] | Commercial Wholesale Retail Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	34,156	45,363
Commercial Loan [Member] | Commercial Wholesale Retail Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	21,180	8,486
Commercial Loan [Member] | Commercial Manufacturing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Non - Graded	0
Total	350,834	325,191
Commercial Loan [Member] | Commercial Manufacturing Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	325,393	319,075
Financing Receivable Non - Graded	0
Commercial Loan [Member] | Commercial Manufacturing Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	2,390	4,000
Commercial Loan [Member] | Commercial Manufacturing Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	23,051	2,116
Financing Receivable Non - Graded	0
Total	350,834	325,191
Commercial Loan [Member] | Commercial Healthcare Financing Receivable [Member]
Recorded Investment [Abstract]
Total	976,481	809,625
Commercial Loan [Member] | Commercial Healthcare Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	967,581	801,525
Financing Receivable Non - Graded	0
Commercial Loan [Member] | Commercial Healthcare Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	3,414	4,566
Commercial Loan [Member] | Commercial Healthcare Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	5,486	3,534
Financing Receivable Non - Graded	0
Commercial Loan [Member] | Commercial Integrated Food Services Financing Receivables [Member]
Recorded Investment [Abstract]
Total	208,738	204,283
Commercial Loan [Member] | Commercial Integrated Food Services Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	207,982	202,885
Financing Receivable Non - Graded	0
Commercial Loan [Member] | Commercial Integrated Food Services Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	756	1,385
Commercial Loan [Member] | Commercial Integrated Food Services Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	13
Financing Receivable Non - Graded	0
Commercial Loan [Member] | Commercial Other Commercial and Industrial [Member]
Recorded Investment [Abstract]
Total	311,609	292,321
Commercial Loan [Member] | Commercial Other Commercial and Industrial [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	291,393	267,949
Financing Receivable Non - Graded	18,416	19,685
Commercial Loan [Member] | Commercial Other Commercial and Industrial [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	10	108
Commercial Loan [Member] | Commercial Other Commercial and Industrial [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	1,738	4,446
Financing Receivable Non - Graded	52
Commercial Loan [Member] | Internally Assigned Grade [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	73,481
Commercial Real Estate [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	2,279,909	2,277,350
Total	2,279,909	2,277,350
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	67,034	98,709
Allowance For Financing Receivable Non- Graded	0	0
Allowance For Financing Receivable Total	67,034	98,709
Commercial Real Estate [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	2,113,478	2,067,176
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	67,238	59,808
Commercial Real Estate [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	99,193	150,366
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Recorded Investment [Abstract]
Total	327,480	447,864
Commercial Real Estate [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	238,362	326,769
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	27,244	21,516
Commercial Real Estate [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	61,874	99,579
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Retail Financing Receivables [Member]
Recorded Investment [Abstract]
Total	509,743	405,540
Commercial Real Estate [Member] | Commercial Real Estate Retail Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	499,636	395,094
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Retail Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	3,244	5,468
Commercial Real Estate [Member] | Commercial Real Estate Retail Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	6,863	4,978
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Office Financing Receivables [Member]
Recorded Investment [Abstract]
Total	406,508	457,450
Commercial Real Estate [Member] | Commercial Real Estate Office Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	382,503	420,899
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Office Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	12,548	16,897
Commercial Real Estate [Member] | Commercial Real Estate Office Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	11,457	19,654
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Multifamily Financing Receivables [Member]
Recorded Investment [Abstract]
Total	368,519	369,242
Commercial Real Estate [Member] | Commercial Real Estate Multifamily Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	356,927	355,733
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Multifamily Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	8,079	6,784
Commercial Real Estate [Member] | Commercial Real Estate Multifamily Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	3,513	6,725
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Industrial [Member]
Recorded Investment [Abstract]
Total	277,733	182,093
Commercial Real Estate [Member] | Commercial Real Estate Industrial [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	277,453	177,712
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Industrial [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	280	294
Commercial Real Estate [Member] | Commercial Real Estate Industrial [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	4,087
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Other Real Estate Loans Financing Receivables [Member]
Recorded Investment [Abstract]
Total	389,926	415,161
Commercial Real Estate [Member] | Commercial Real Estate Other Real Estate Loans Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	358,597	390,969
Financing Receivable Non - Graded	0
Commercial Real Estate [Member] | Commercial Real Estate Other Real Estate Loans Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	15,843	8,849
Commercial Real Estate [Member] | Commercial Real Estate Other Real Estate Loans Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	15,486	15,343
Financing Receivable Non - Graded	0
Residential Mortgage [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	314,475	451,874
Financing Receivable Non - Graded	1,655,986	1,376,374
Total	1,970,461	1,828,248
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	8,262	8,356
Allowance For Financing Receivable Non- Graded	30,945	41,925
Allowance For Financing Receivable Total	39,207	50,281
Residential Mortgage [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	291,155	420,407
Financing Receivable Non - Graded	1,633,660	1,351,012
Residential Mortgage [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	15,879	19,403
Residential Mortgage [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	7,441	12,064
Financing Receivable Non - Graded	22,326	25,362
Residential Mortgage [Member] | Residential Mortgage Permanent Mortgage Financing Receivables [Member]
Recorded Investment [Abstract]
Total	1,150,321	1,274,944
Residential Mortgage [Member] | Residential Mortgage Permanent Mortgage Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	291,155	420,407
Financing Receivable Non - Graded	817,921	803,023
Residential Mortgage [Member] | Residential Mortgage Permanent Mortgage Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	15,879	19,403
Residential Mortgage [Member] | Residential Mortgage Permanent Mortgage Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	7,441	12,064
Financing Receivable Non - Graded	17,925	20,047
Residential Mortgage [Member] | Home Equity [Member]
Recorded Investment [Abstract]
Total	635,167	553,304
Residential Mortgage [Member] | Home Equity [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0
Financing Receivable Non - Graded	630,766	547,989
Residential Mortgage [Member] | Home Equity [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0
Residential Mortgage [Member] | Home Equity [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0
Financing Receivable Non - Graded	4,401	5,315
Residential Mortgage [Member] | Residential Mortgage Permanent Mortgage Us Government Agency Guaranteed Financing Receivables [Member]
Recorded Investment [Abstract]
Total	184,973	72,385
Residential Mortgage [Member] | Residential Mortgage Permanent Mortgage Us Government Agency Guaranteed Financing Receivables [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0
Financing Receivable Non - Graded	184,973	72,385
Residential Mortgage [Member] | Residential Mortgage Permanent Mortgage Us Government Agency Guaranteed Financing Receivables [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0
Residential Mortgage [Member] | Residential Mortgage Permanent Mortgage Us Government Agency Guaranteed Financing Receivables [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0	0
Financing Receivable Non - Graded	0	0
Consumer Loan [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	216,271	246,350
Financing Receivable Non - Graded	231,648	357,092
Total	447,919	603,442
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	2,527	1,881
Allowance For Financing Receivable Non- Graded	14,920	10,733
Allowance For Financing Receivable Total	17,447	12,614
Consumer Loan [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	211,226	240,243
Financing Receivable Non - Graded	229,229	354,276
Consumer Loan [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	3,949	4,356
Consumer Loan [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	1,096	1,751
Financing Receivable Non - Graded	2,419	2,816
Consumer Loan [Member] | Indirect Automobile [Member]
Recorded Investment [Abstract]
Total	105,149	239,576
Consumer Loan [Member] | Indirect Automobile [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0
Financing Receivable Non - Graded	102,955	237,050
Consumer Loan [Member] | Indirect Automobile [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0
Consumer Loan [Member] | Indirect Automobile [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	0
Financing Receivable Non - Graded	2,194	2,526
Consumer Loan [Member] | Consumer Other Financing Receivable [Member]
Recorded Investment [Abstract]
Total	342,770	363,866
Consumer Loan [Member] | Consumer Other Financing Receivable [Member] | Performing Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	211,226	240,243
Financing Receivable Non - Graded	126,274	117,226
Consumer Loan [Member] | Consumer Other Financing Receivable [Member] | Potential Problem Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	3,949	4,356
Consumer Loan [Member] | Consumer Other Financing Receivable [Member] | Nonaccrual Financing Receivable [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	1,096	1,751
Financing Receivable Non - Graded	225	290
Allocated Class of Receivables [Member]
Recorded Investment [Abstract]
Financing Receivable Internally Graded	9,363,641	8,889,752
Financing Receivable Non - Graded	1,906,102	1,753,284
Total	11,269,743	10,643,036
Related Allowance [Abstract]
Allowance For Financing Receivable Internally Graded	160,086	211,205
Allowance For Financing Receivable Non- Graded	47,045	55,030
Allowance For Financing Receivable Total	207,131	266,235
Unallocated Financing Receivables [Member]
Related Allowance [Abstract]
Allowance For Financing Receivable Total	$ 46,350	$ 26,736