Loans and Leases (Aging Of The Outstanding Loans and Leases By Class Excluding Loans Impaired At Acquisition Date) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	$ 12,200,226	$ 12,104,298
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	8,592,732	8,499,348
Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	335,271	319,847
Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	6,330,843	6,362,490
Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	177,082	178,754
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	1,175,543	1,081,158
Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	394,268	381,763
Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	179,725	175,336
Noncommerical
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	3,607,494	3,604,950
Noncommerical | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	1,030,032	982,421
Noncommerical | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	2,091,000	2,113,285
Noncommerical | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	119,049	122,792
Noncommerical | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	367,413	386,452
Originated Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	60,308	44,167
60-89 Days Past Due	11,246	14,236
90 Days or Greater	27,066	30,828
Total	98,620	89,231
Current	12,101,606	12,015,067
Total Originated Loans and Leases	12,200,226	12,104,298
Originated Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	537	1,603
60-89 Days Past Due	184	9
90 Days or Greater	655	457
Total	1,376	2,069
Current	333,895	317,778
Total Originated Loans and Leases	335,271	319,847
Originated Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	24,451	11,131
60-89 Days Past Due	3,934	3,601
90 Days or Greater	11,248	14,407
Total	39,633	29,139
Current	6,291,210	6,333,351
Total Originated Loans and Leases	6,330,843	6,362,490
Originated Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	155	139
60-89 Days Past Due	11	210
90 Days or Greater	104	470
Total	270	819
Current	176,812	177,935
Total Originated Loans and Leases	177,082	178,754
Originated Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	3,921	3,336
60-89 Days Past Due	488	682
90 Days or Greater	509	436
Total	4,918	4,454
Current	1,170,625	1,076,704
Total Originated Loans and Leases	1,175,543	1,081,158
Originated Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	757	789
60-89 Days Past Due	323	1,341
90 Days or Greater	92	101
Total	1,172	2,231
Current	393,096	379,532
Total Originated Loans and Leases	394,268	381,763
Originated Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	20	0
60-89 Days Past Due	5	85
90 Days or Greater	0	0
Total	25	85
Current	179,700	175,251
Total Originated Loans and Leases	179,725	175,336
Originated Loans | Noncommerical
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	30,467	27,169
60-89 Days Past Due	6,301	8,308
90 Days or Greater	14,458	14,957
Current	3,556,268	3,554,516
Total Originated Loans and Leases	3,607,494	3,604,950
Originated Loans | Noncommerical | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	16,845	12,885
60-89 Days Past Due	1,063	4,658
90 Days or Greater	9,108	9,578
Total	27,016	27,121
Current	1,003,016	955,300
Total Originated Loans and Leases	1,030,032	982,421
Originated Loans | Noncommerical | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	10,578	10,977
60-89 Days Past Due	3,249	2,378
90 Days or Greater	4,341	4,450
Total	18,168	17,805
Current	2,072,832	2,095,480
Total Originated Loans and Leases	2,091,000	2,113,285
Originated Loans | Noncommerical | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	888	1,193
60-89 Days Past Due	794	317
90 Days or Greater	206	256
Total	1,888	1,766
Current	117,161	121,026
Total Originated Loans and Leases	119,049	122,792
Originated Loans | Noncommerical | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,156	2,114
60-89 Days Past Due	1,195	955
90 Days or Greater	803	673
Total	4,154	3,742
Current	363,259	382,710
Total Originated Loans and Leases	$ 367,413	$ 386,452