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	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	$ 12,806,511	$ 12,104,298
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	9,052,309	8,499,348
Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	382,775	319,847
Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	6,475,366	6,362,490
Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	177,681	178,754
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	1,359,945	1,081,158
Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	443,318	381,763
Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	213,224	175,336
Noncommerical
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	3,754,202	3,604,950
Noncommerical | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	1,141,049	982,421
Noncommerical | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	2,120,167	2,113,285
Noncommerical | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	117,209	122,792
Noncommerical | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Originated Loans and Leases	375,777	386,452
Originated Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	48,389	44,167
60-89 Days Past Due	11,961	14,236
90 Days or Greater	26,213	30,828
Total	86,563	89,231
Current	12,719,948	12,015,067
Total Originated Loans and Leases	12,806,511	12,104,298
Originated Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	379	1,603
60-89 Days Past Due	13	9
90 Days or Greater	313	457
Total	705	2,069
Current	382,070	317,778
Total Originated Loans and Leases	382,775	319,847
Originated Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	11,337	11,131
60-89 Days Past Due	4,536	3,601
90 Days or Greater	11,009	14,407
Total	26,882	29,139
Current	6,448,484	6,333,351
Total Originated Loans and Leases	6,475,366	6,362,490
Originated Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	808	139
60-89 Days Past Due	67	210
90 Days or Greater	0	470
Total	875	819
Current	176,806	177,935
Total Originated Loans and Leases	177,681	178,754
Originated Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	5,366	3,336
60-89 Days Past Due	634	682
90 Days or Greater	845	436
Total	6,845	4,454
Current	1,353,100	1,076,704
Total Originated Loans and Leases	1,359,945	1,081,158
Originated Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	527	789
60-89 Days Past Due	322	1,341
90 Days or Greater	513	101
Total	1,362	2,231
Current	441,956	379,532
Total Originated Loans and Leases	443,318	381,763
Originated Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	85
90 Days or Greater	0	0
Total	0	85
Current	213,224	175,251
Total Originated Loans and Leases	213,224	175,336
Originated Loans | Noncommerical
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	29,972	27,169
60-89 Days Past Due	6,389	8,308
90 Days or Greater	13,533	14,957
Current	3,704,308	3,554,516
Total Originated Loans and Leases	3,754,202	3,604,950
Originated Loans | Noncommerical | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	18,528	12,885
60-89 Days Past Due	3,380	4,658
90 Days or Greater	7,770	9,578
Total	29,678	27,121
Current	1,111,371	955,300
Total Originated Loans and Leases	1,141,049	982,421
Originated Loans | Noncommerical | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	8,941	10,977
60-89 Days Past Due	2,064	2,378
90 Days or Greater	4,950	4,450
Total	15,955	17,805
Current	2,104,212	2,095,480
Total Originated Loans and Leases	2,120,167	2,113,285
Originated Loans | Noncommerical | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	458	1,193
60-89 Days Past Due	117	317
90 Days or Greater	257	256
Total	832	1,766
Current	116,377	121,026
Total Originated Loans and Leases	117,209	122,792
Originated Loans | Noncommerical | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,045	2,114
60-89 Days Past Due	828	955
90 Days or Greater	556	673
Total	3,429	3,742
Current	372,348	382,710
Total Originated Loans and Leases	$ 375,777	$ 386,452