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, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	$ 11,884,585	[1]	$ 11,576,115	[1]
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	8,342,100		7,994,495
Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	300,266		309,190
Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	6,308,192		6,029,435
Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	177,599		160,980
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	1,009,641		1,038,530
Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	365,967		330,679
Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	180,435		125,681
Noncommerical
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	3,542,485		3,581,620
Noncommerical | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	927,426		822,889
Noncommerical | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	2,113,240		2,210,133
Noncommerical | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	121,553		131,992
Noncommerical | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	380,266		416,606
Originated Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	48,895		64,528
60-89 Days Past Due	17,735		19,620
90 Days or Greater	38,465		50,412
Total	105,095		134,560
Current	11,779,490		11,441,555
Total Loans and Leases	11,884,585		11,576,115
Originated Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,755		927
60-89 Days Past Due	49		0
90 Days or Greater	562		7,878
Total	2,366		8,805
Current	297,900		300,385
Total Loans and Leases	300,266		309,190
Originated Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	15,917		24,447
60-89 Days Past Due	10,522		4,179
90 Days or Greater	18,449		21,327
Total	44,888		49,953
Current	6,263,304		5,979,482
Total Loans and Leases	6,308,192		6,029,435
Originated Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	103		387
60-89 Days Past Due	400		1,240
90 Days or Greater	1,169		1,034
Total	1,672		2,661
Current	175,927		158,319
Total Loans and Leases	177,599		160,980
Originated Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,633		2,833
60-89 Days Past Due	796		1,096
90 Days or Greater	1,675		605
Total	5,104		4,534
Current	1,004,537		1,033,996
Total Loans and Leases	1,009,641		1,038,530
Originated Loans | Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,317		991
60-89 Days Past Due	0		138
90 Days or Greater	178		621
Total	2,495		1,750
Current	363,472		328,929
Total Loans and Leases	365,967		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	0		13
90 Days or Greater	0		0
Total	0		31
Current	180,435		125,650
Total Loans and Leases	180,435		125,681
Originated Loans | Noncommerical
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	26,170		34,925
60-89 Days Past Due	5,968		12,954
90 Days or Greater	16,432		18,947
Current	3,493,915		3,514,794
Total Loans and Leases	3,542,485		3,581,620
Originated Loans | Noncommerical | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	11,840		15,711
60-89 Days Past Due	3,312		7,559
90 Days or Greater	11,649		12,993
Total	26,801		36,263
Current	900,625		786,626
Total Loans and Leases	927,426		822,889
Originated Loans | Noncommerical | Revolving mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	9,921		12,868
60-89 Days Past Due	1,556		3,200
90 Days or Greater	4,105		3,879
Total	15,582		19,947
Current	2,097,658		2,190,186
Total Loans and Leases	2,113,240		2,210,133
Originated Loans | Noncommerical | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,907		1,941
60-89 Days Past Due	85		490
90 Days or Greater	166		797
Total	2,158		3,228
Current	119,395		128,764
Total Loans and Leases	121,553		131,992
Originated Loans | Noncommerical | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,502		4,405
60-89 Days Past Due	1,015		1,705
90 Days or Greater	512		1,278
Total	4,029		7,388
Current	376,237		409,218
Total Loans and Leases	$ 380,266		$ 416,606

[1] Derived from 2012 Annual Report on Form 10-K.