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	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	$ 12,415,023	$ 12,104,298
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	8,724,702	8,499,348
Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	342,021	319,847
Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	6,367,096	6,362,490
Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	178,899	178,754
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	1,292,213	1,081,158
Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	413,422	381,763
Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	131,051	175,336
Noncommerical
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	3,690,321	3,604,950
Noncommerical | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	1,071,089	982,421
Noncommerical | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	2,122,675	2,113,285
Noncommerical | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	119,420	122,792
Noncommerical | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	377,137	386,452
Originated Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	41,280	44,167
60-89 Days Past Due	12,141	14,236
90 Days or Greater	25,204	30,828
Total	78,625	89,231
Current	12,336,398	12,015,067
Total Originated Loans and Leases	12,415,023	12,104,298
Originated Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	657	1,603
60-89 Days Past Due	40	9
90 Days or Greater	462	457
Total	1,159	2,069
Current	340,862	317,778
Total Originated Loans and Leases	342,021	319,847
Originated Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	11,755	11,131
60-89 Days Past Due	3,089	3,601
90 Days or Greater	10,501	14,407
Total	25,345	29,139
Current	6,341,751	6,333,351
Total Originated Loans and Leases	6,367,096	6,362,490
Originated Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	149	139
60-89 Days Past Due	0	210
90 Days or Greater	52	470
Total	201	819
Current	178,698	177,935
Total Originated Loans and Leases	178,899	178,754
Originated Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	5,459	3,336
60-89 Days Past Due	805	682
90 Days or Greater	593	436
Total	6,857	4,454
Current	1,285,356	1,076,704
Total Originated Loans and Leases	1,292,213	1,081,158
Originated Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,110	789
60-89 Days Past Due	8	1,341
90 Days or Greater	97	101
Total	1,215	2,231
Current	412,207	379,532
Total Originated Loans and Leases	413,422	381,763
Originated Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	343	0
60-89 Days Past Due	0	85
90 Days or Greater	0	0
Total	343	85
Current	130,708	175,251
Total Originated Loans and Leases	131,051	175,336
Originated Loans | Noncommerical
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	21,807	27,169
60-89 Days Past Due	8,199	8,308
90 Days or Greater	13,499	14,957
Current	3,646,816	3,554,516
Total Originated Loans and Leases	3,690,321	3,604,950
Originated Loans | Noncommerical | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	11,219	12,885
60-89 Days Past Due	4,693	4,658
90 Days or Greater	7,907	9,578
Total	23,819	27,121
Current	1,047,270	955,300
Total Originated Loans and Leases	1,071,089	982,421
Originated Loans | Noncommerical | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	7,690	10,977
60-89 Days Past Due	2,434	2,378
90 Days or Greater	4,662	4,450
Total	14,786	17,805
Current	2,107,889	2,095,480
Total Originated Loans and Leases	2,122,675	2,113,285
Originated Loans | Noncommerical | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	949	1,193
60-89 Days Past Due	229	317
90 Days or Greater	164	256
Total	1,342	1,766
Current	118,078	121,026
Total Originated Loans and Leases	119,420	122,792
Originated Loans | Noncommerical | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,949	2,114
60-89 Days Past Due	843	955
90 Days or Greater	766	673
Total	3,558	3,742
Current	373,579	382,710
Total Originated Loans and Leases	$ 377,137	$ 386,452