Loans, Allowance for Loan and Lease Losses, and Reserve for Off-Balance Sheet Credit Commitments (Details 5) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Past Due Loans and Leases
30-59 Days Past Due	$ 33,781	$ 25,946	$ 70,279
60-89 Days Past Due	2,139	9,431	12,244
Greater Than 90 Days and Accruing	7,214	2,499	789
Nonaccrual	132,800	190,923	260,118
Total Past Due and Nonaccrual Loans	175,934	228,799	343,430
Current	11,487,189	11,157,829	11,139,614
Total Loans and Leases	11,663,123	11,386,628	11,483,044
Commercial
Past Due Loans and Leases
30-59 Days Past Due	18,270	9,832	29,781
60-89 Days Past Due	622	4,178	2,898
Greater Than 90 Days and Accruing	351	904	149
Nonaccrual	23,575	19,498	44,431
Total Past Due and Nonaccrual Loans	42,818	34,412	77,259
Current	4,378,081	4,102,462	3,858,285
Total Loans and Leases	4,420,899	4,136,874	3,935,544
Commercial real estate mortgages
Past Due Loans and Leases
30-59 Days Past Due	15,342	15,112	5,442
60-89 Days Past Due		3,996	1,422
Greater Than 90 Days and Accruing	586
Nonaccrual	26,676	44,882	57,155
Total Past Due and Nonaccrual Loans	42,604	63,990	64,019
Current	1,887,665	1,894,327	2,013,984
Total Loans and Leases	1,930,269	1,958,317	2,078,003
Residential mortgage
Past Due Loans and Leases
60-89 Days Past Due	1,317	731	4,029
Greater Than 90 Days and Accruing	1,282	379	640
Nonaccrual	14,211	18,721	11,506
Total Past Due and Nonaccrual Loans	16,810	19,831	16,175
Current	3,693,955	3,532,481	3,561,719
Total Loans and Leases	3,710,765	3,552,312	3,577,894
Fixed
Past Due Loans and Leases
60-89 Days Past Due		731	2,773
Greater Than 90 Days and Accruing	1,282	379	640
Nonaccrual	10,036	13,253	7,002
Total Past Due and Nonaccrual Loans	11,318	14,363	10,415
Current	1,664,751	1,628,683	1,663,212
Total Loans and Leases	1,676,069	1,643,046	1,673,627
Variable
Past Due Loans and Leases
60-89 Days Past Due	1,317		1,256
Nonaccrual	4,175	5,468	4,504
Total Past Due and Nonaccrual Loans	5,492	5,468	5,760
Current	2,029,204	1,903,798	1,898,507
Total Loans and Leases	2,034,696	1,909,266	1,904,267
Real estate construction
Past Due Loans and Leases
30-59 Days Past Due		554	34,635
60-89 Days Past Due			3,851
Greater Than 90 Days and Accruing	4,995
Nonaccrual	60,543	98,209	138,909
Total Past Due and Nonaccrual Loans	65,538	98,763	177,395
Current	289,476	369,022	452,507
Total Loans and Leases	355,014	467,785	629,902
Construction
Past Due Loans and Leases
30-59 Days Past Due		554	33,610
60-89 Days Past Due			3,851
Nonaccrual	39,097	74,446	97,706
Total Past Due and Nonaccrual Loans	39,097	75,000	135,167
Current	198,183	251,518	320,643
Total Loans and Leases	237,280	326,518	455,810
Land
Past Due Loans and Leases
30-59 Days Past Due			1,025
Greater Than 90 Days and Accruing	4,995
Nonaccrual	21,446	23,763	41,203
Total Past Due and Nonaccrual Loans	26,441	23,763	42,228
Current	91,293	117,504	131,864
Total Loans and Leases	117,734	141,267	174,092
Equity lines of credit
Past Due Loans and Leases
30-59 Days Past Due	74	74	249
60-89 Days Past Due	160	526
Nonaccrual	6,668	6,782	3,909
Total Past Due and Nonaccrual Loans	6,902	7,382	4,158
Current	728,997	726,359	737,913
Total Loans and Leases	735,899	733,741	742,071
Installment loan
Past Due Loans and Leases
30-59 Days Past Due	95	367	172
60-89 Days Past Due	40		44
Nonaccrual	365	590	972
Total Past Due and Nonaccrual Loans	500	957	1,188
Current	130,424	159,187	167,882
Total Loans and Leases	130,924	160,144	169,070
Commercial Installment loan
Past Due Loans and Leases
30-59 Days Past Due		63
Nonaccrual	68	308	112
Total Past Due and Nonaccrual Loans	68	371	112
Current	1,418	30,790	40,493
Total Loans and Leases	1,486	31,161	40,605
Consumer Installment loan
Past Due Loans and Leases
30-59 Days Past Due	95	304	172
60-89 Days Past Due	40		44
Nonaccrual	297	282	860
Total Past Due and Nonaccrual Loans	432	586	1,076
Current	129,006	128,397	127,389
Total Loans and Leases	129,438	128,983	128,465
Lease financing
Past Due Loans and Leases
30-59 Days Past Due		7
Greater Than 90 Days and Accruing		1,216
Nonaccrual	762	2,241	3,236
Total Past Due and Nonaccrual Loans	762	3,464	3,236
Current	378,591	373,991	347,324
Total Loans and Leases	$ 379,353	$ 377,455	$ 350,560