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	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	$ 12,104,298	$ 11,576,115
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	8,499,348	7,994,495
Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	319,847	309,190
Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	6,362,490	6,029,435
Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	178,754	160,980
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	1,081,158	1,038,530
Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	381,763	330,679
Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	175,336	125,681
Noncommerical
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	3,604,950	3,581,620
Noncommerical | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	982,421	822,889
Noncommerical | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	2,113,285	2,210,133
Noncommerical | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	122,792	131,992
Noncommerical | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	386,452	416,606
Originated Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	44,167	64,528
60-89 Days Past Due	14,236	19,620
90 Days or Greater	30,828	50,412
Total	89,231	134,560
Current	12,015,067	11,441,555
Total Loans and Leases	12,104,298	11,576,115
Originated Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,603	927
60-89 Days Past Due	9	0
90 Days or Greater	457	7,878
Total	2,069	8,805
Current	317,778	300,385
Total Loans and Leases	319,847	309,190
Originated Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	11,131	24,447
60-89 Days Past Due	3,601	4,179
90 Days or Greater	14,407	21,327
Total	29,139	49,953
Current	6,333,351	5,979,482
Total Loans and Leases	6,362,490	6,029,435
Originated Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	139	387
60-89 Days Past Due	210	1,240
90 Days or Greater	470	1,034
Total	819	2,661
Current	177,935	158,319
Total Loans and Leases	178,754	160,980
Originated Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	3,336	2,833
60-89 Days Past Due	682	1,096
90 Days or Greater	436	605
Total	4,454	4,534
Current	1,076,704	1,033,996
Total Loans and Leases	1,081,158	1,038,530
Originated Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	789	991
60-89 Days Past Due	1,341	138
90 Days or Greater	101	621
Total	2,231	1,750
Current	379,532	328,929
Total Loans and Leases	381,763	330,679
Originated Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	18
60-89 Days Past Due	85	13
90 Days or Greater	0	0
Total	85	31
Current	175,251	125,650
Total Loans and Leases	175,336	125,681
Originated Loans | Noncommerical
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	27,169	34,925
60-89 Days Past Due	8,308	12,954
90 Days or Greater	14,957	18,947
Current	3,554,516	3,514,794
Total Loans and Leases	3,604,950	3,581,620
Originated Loans | Noncommerical | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	12,885	15,711
60-89 Days Past Due	4,658	7,559
90 Days or Greater	9,578	12,993
Total	27,121	36,263
Current	955,300	786,626
Total Loans and Leases	982,421	822,889
Originated Loans | Noncommerical | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	10,977	12,868
60-89 Days Past Due	2,378	3,200
90 Days or Greater	4,450	3,879
Total	17,805	19,947
Current	2,095,480	2,190,186
Total Loans and Leases	2,113,285	2,210,133
Originated Loans | Noncommerical | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,193	1,941
60-89 Days Past Due	317	490
90 Days or Greater	256	797
Total	1,766	3,228
Current	121,026	128,764
Total Loans and Leases	122,792	131,992
Originated Loans | Noncommerical | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,114	4,405
60-89 Days Past Due	955	1,705
90 Days or Greater	673	1,278
Total	3,742	7,388
Current	382,710	409,218
Total Loans and Leases	$ 386,452	$ 416,606