Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Loan and Lease Losses [Roll Forward]
Reclassification	$ 7,368	[1]	$ 0	$ 0
Charge-offs	68,026		100,478	196,840
Recoveries	7,289		6,467	6,942
Provision for loan and lease losses	(32,255)		142,885	232,277
Loans and Leases Evaluated for Impairment [Abstract]
Net loans and leases	12,900,330		13,066,332
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Allowance for loan and lease losses	233,394		319,018	270,144	227,765
Allowance for Loan and Lease Losses Write-offs, Net	(60,737)		(94,011)	(189,898)
Commercial | Construction and land development
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Non-specific ALLL	0
Commercial | Mortgage
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Non-specific ALLL	0
Commercial | Other commercial real estate
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Non-specific ALLL	0
Commercial | Commercial and industrial
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Non-specific ALLL	0
Commercial | Lease financing
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Non-specific ALLL	0
Commercial | Other
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Non-specific ALLL	0
Noncommerical
Allowance for Loan and Lease Losses [Roll Forward]
Reclassification	7,368
Noncommerical | Mortgage
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Non-specific ALLL	0
Noncommerical | Construction and land development
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Non-specific ALLL	0
Noncommerical | Revolving mortgage
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Non-specific ALLL	0
Noncommerical | Consumer
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Non-specific ALLL	0
Noncommerical | Non-specific
Allowance for Loan and Lease Losses [Roll Forward]
Reclassification	(15,772)
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Non-specific ALLL	0
Originated Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	179,046		180,883	176,517
Reclassification	7,368	[1]
Charge-offs	33,118		50,208	59,287
Recoveries	7,289		6,325	5,854
Provisions	19,289		42,046	57,799
Ending balance	179,874		179,046	180,883
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	10,161		18,355
ALLL for loans and leases collectively evaluated for impairment	169,713		144,841
Non-specific ALLL	0		15,850
Total allowance for loan and lease losses	179,874		179,046	180,883
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	132,146		202,253
Loans and leases collectively evaluated for impairment	11,972,152		11,373,862
Net loans and leases	12,104,298		11,576,115
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
Allowance for Loan and Lease Losses Write-offs, Net	(25,829)		(43,883)	(53,433)
Originated Loans | Commercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,031		5,467
Reclassification	5,141	[1]
Charge-offs	(4,685)		(9,546)
Recoveries	1,039		445
Provisions	2,809		9,665
Ending balance	10,335		6,031
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	103		2,469
ALLL for loans and leases collectively evaluated for impairment	10,232		3,562
Non-specific ALLL			0
Total allowance for loan and lease losses	10,335		6,031
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	2,272		17,075
Loans and leases collectively evaluated for impairment	317,575		292,115
Net loans and leases	319,847		309,190
Originated Loans | Commercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	80,229		67,486
Reclassification	27,421	[1]
Charge-offs	(3,904)		(7,081)
Recoveries	996		1,626
Provisions	(4,485)		18,198
Ending balance	100,257		80,229
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	6,873		11,697
ALLL for loans and leases collectively evaluated for impairment	93,384		68,532
Non-specific ALLL			0
Total allowance for loan and lease losses	100,257		80,229
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	97,111		133,804
Loans and leases collectively evaluated for impairment	6,265,379		5,895,631
Net loans and leases	6,362,490		6,029,435
Originated Loans | Commercial | Other commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,059		2,169
Reclassification	(815)	[1]
Charge-offs	(312)		(254)
Recoveries	109		14
Provisions	(32)		130
Ending balance	1,009		2,059
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	209		298
ALLL for loans and leases collectively evaluated for impairment	800		1,761
Non-specific ALLL			0
Total allowance for loan and lease losses	1,009		2,059
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	1,878		3,375
Loans and leases collectively evaluated for impairment	176,876		157,605
Net loans and leases	178,754		160,980
Originated Loans | Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	14,050		23,723
Reclassification	7,551	[1]
Charge-offs	(4,785)		(5,472)
Recoveries	1,213		781
Provisions	4,333		(4,982)
Ending balance	22,362		14,050
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	771		2,133
ALLL for loans and leases collectively evaluated for impairment	21,591		11,917
Non-specific ALLL			0
Total allowance for loan and lease losses	22,362		14,050
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	9,300		22,619
Loans and leases collectively evaluated for impairment	1,071,858		1,015,911
Net loans and leases	1,081,158		1,038,530
Originated Loans | Commercial | Lease financing
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,521		3,288
Reclassification	(253)	[1]
Charge-offs	(272)		(361)
Recoveries	107		96
Provisions	1,646		498
Ending balance	4,749		3,521
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	54		202
ALLL for loans and leases collectively evaluated for impairment	4,695		3,319
Non-specific ALLL			0
Total allowance for loan and lease losses	4,749		3,521
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	188		804
Loans and leases collectively evaluated for impairment	381,575		329,875
Net loans and leases	381,763		330,679
Originated Loans | Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,175		1,315
Reclassification	(1,288)	[1]
Charge-offs	(6)		(28)
Recoveries	1		4
Provisions	308		(116)
Ending balance	190		1,175
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	0		53
ALLL for loans and leases collectively evaluated for impairment	190		1,122
Non-specific ALLL			0
Total allowance for loan and lease losses	190		1,175
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	0		707
Loans and leases collectively evaluated for impairment	175,336		124,974
Net loans and leases	175,336		125,681
Originated Loans | Noncommerical | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,836		8,879
Reclassification	5,717	[1]
Charge-offs	(2,387)		(4,790)
Recoveries	559		529
Provisions	2,786		(782)
Ending balance	10,511		3,836
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	1,586		959
ALLL for loans and leases collectively evaluated for impairment	8,925		2,877
Non-specific ALLL			0
Total allowance for loan and lease losses	10,511		3,836
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	15,539		15,836
Loans and leases collectively evaluated for impairment	966,882		807,053
Net loans and leases	982,421		822,889
Originated Loans | Noncommerical | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,721		1,427
Reclassification	(478)	[1]
Charge-offs	(392)		(1,047)
Recoveries	209		180
Provisions	(379)		1,161
Ending balance	681		1,721
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	72		287
ALLL for loans and leases collectively evaluated for impairment	609		1,434
Non-specific ALLL			0
Total allowance for loan and lease losses	681		1,721
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	1,108		1,321
Loans and leases collectively evaluated for impairment	121,684		130,671
Net loans and leases	122,792		131,992
Originated Loans | Noncommerical | Revolving mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	25,185		27,045
Reclassification	(9,838)	[1]
Charge-offs	(6,064)		(11,341)
Recoveries	660		698
Provisions	6,296		8,783
Ending balance	16,239		25,185
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	372		1
ALLL for loans and leases collectively evaluated for impairment	15,867		25,184
Non-specific ALLL			0
Total allowance for loan and lease losses	16,239		25,185
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	3,596		4,203
Loans and leases collectively evaluated for impairment	2,109,689		2,205,930
Net loans and leases	2,113,285		2,210,133
Originated Loans | Noncommerical | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	25,389		25,962
Reclassification	(10,018)	[1]
Charge-offs	(10,311)		(10,288)
Recoveries	2,396		1,952
Provisions	6,085		7,763
Ending balance	13,541		25,389
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	121		256
ALLL for loans and leases collectively evaluated for impairment	13,420		25,133
Non-specific ALLL			0
Total allowance for loan and lease losses	13,541		25,389
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	1,154		2,509
Loans and leases collectively evaluated for impairment	385,298		414,097
Net loans and leases	386,452		416,606
Originated Loans | Noncommerical | Non-specific
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	15,850		14,122
Reclassification	(15,772)	[1]
Charge-offs	0		0
Recoveries	0		0
Provisions	(78)		1,728
Ending balance	0		15,850
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
ALLL for loans and leases individually evaluated for impairment	0		0
ALLL for loans and leases collectively evaluated for impairment	0		0
Non-specific ALLL			15,850
Total allowance for loan and lease losses	0		15,850
Loans and Leases Evaluated for Impairment [Abstract]
Loans and leases individually evaluated for impairment	0		0
Loans and leases collectively evaluated for impairment	0		0
Net loans and leases	0		0
Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	139,972		89,261	51,248
Reclassification	0	[1]
Charge-offs	34,908		50,270	137,553
Recoveries	0		142	1,088
Provisions	(51,544)		100,839	174,478
Ending balance	53,520		139,972	89,261
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	53,520		139,972	89,261
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	53,520		139,972
Loans and leases acquired with deteriorated credit quality	1,029,426		1,809,235
Allowance for Loan and Lease Losses Write-offs, Net	(34,908)		(50,128)	(136,465)
Acquired Loans | Commercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	31,186		16,693
Charge-offs	(6,924)		(8,667)
Recoveries	0		0
Provisions	(22,942)		23,160
Ending balance	1,320		31,186
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	1,320		31,186
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	1,320		31,186
Loans and leases acquired with deteriorated credit quality	78,915		237,906
Acquired Loans | Commercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	50,275		39,557
Charge-offs	(16,497)		(23,509)
Recoveries	0		0
Provisions	(3,872)		34,227
Ending balance	29,906		50,275
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	29,906		50,275
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	29,906		50,275
Loans and leases acquired with deteriorated credit quality	642,891		1,054,473
Acquired Loans | Commercial | Other commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,234		16,862
Charge-offs	(931)		(1,256)
Recoveries	0		0
Provisions	(8,949)		(4,372)
Ending balance	1,354		11,234
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	1,354		11,234
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	1,354		11,234
Loans and leases acquired with deteriorated credit quality	41,381		107,119
Acquired Loans | Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8,897		5,500
Charge-offs	(4,092)		(8,442)
Recoveries	0		0
Provisions	470		11,839
Ending balance	5,275		8,897
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	5,275		8,897
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	5,275		8,897
Loans and leases acquired with deteriorated credit quality	17,254		49,463
Acquired Loans | Commercial | Lease financing
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0		13
Charge-offs	0		0
Recoveries	0		0
Provisions	0		(13)
Ending balance	0		0
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	0		0
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	0		0
Loans and leases acquired with deteriorated credit quality	0		0
Acquired Loans | Noncommerical | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	19,837		5,433
Charge-offs	(2,548)		(4,139)
Recoveries	0		142
Provisions	(5,487)		18,401
Ending balance	11,802		19,837
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	11,802		19,837
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	11,802		19,837
Loans and leases acquired with deteriorated credit quality	213,851		297,926
Acquired Loans | Noncommerical | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8,287		4,652
Charge-offs	(3,435)		(2,885)
Recoveries	0		0
Provisions	(4,170)		6,520
Ending balance	682		8,287
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	682		8,287
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	682		8,287
Loans and leases acquired with deteriorated credit quality	2,583		20,793
Acquired Loans | Noncommerical | Revolving mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,754		77
Charge-offs	(396)		(1,119)
Recoveries	0		0
Provisions	(6,399)		10,796
Ending balance	2,959		9,754
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	2,959		9,754
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	2,959		9,754
Loans and leases acquired with deteriorated credit quality	30,834		38,710
Acquired Loans | Noncommerical | Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	502		474
Charge-offs	(85)		(253)
Recoveries	0		0
Provisions	(195)		281
Ending balance	222		502
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Total allowance for loan and lease losses	222		502
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract]
ALLL for loans and leases acquired with deteriorated credit quality	222		502
Loans and leases acquired with deteriorated credit quality	$ 1,717		$ 2,845

[1] Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.