Loans And Leases (Composition Of The Loans And Leases Outstanding At By Credit Quality Indicator) (Details) (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2010
Current	$ 13,330,648		$ 12,572,667
31-60 days past due	74,715		208,900
61-90 days past due	42,824		65,607
Over 90 days past due	213,084		310,150
Noncovered loans	11,603,526	[1]	11,480,577	[2]	11,545,309	[1]
Total covered loans acquired	2,557,450	[1]	2,007,452	[2]	2,222,660	[1]
Loans to finance buyout, outstanding balance	62,373
Covered Loans [Member]
Current	1,813,261		1,237,427
31-60 days past due	44,558		145,189
61-90 days past due	32,349		40,670
Over 90 days past due	167,577		253,461
Total covered loans acquired	2,557,450		2,007,452		2,222,660
Covered Loans [Member] | Commercial Loans [Member] | Construction And Land Development [Member]
Current	183,289		118,078
31-60 days past due	9,248		64,372
61-90 days past due	7,246		8,985
Over 90 days past due	33,566		73,997
Total covered loans acquired	405,658		368,420
Covered Loans [Member] | Commercial Loans [Member] | Construction And Land Development [Member] | Pass [Member]
Total covered loans acquired	43,851		98,449
Covered Loans [Member] | Commercial Loans [Member] | Construction And Land Development [Member] | Special Mention [Member]
Total covered loans acquired	97,960		90,203
Covered Loans [Member] | Commercial Loans [Member] | Construction And Land Development [Member] | Substandard [Member]
Total covered loans acquired	134,126		79,631
Covered Loans [Member] | Commercial Loans [Member] | Construction And Land Development [Member] | Doubtful [Member]
Total covered loans acquired	125,766		100,137
Covered Loans [Member] | Commercial Loans [Member] | Construction And Land Development [Member] | Ungraded [Member]
Total covered loans acquired	3,955		0
Covered Loans [Member] | Non-Commercial Loans [Member] | Construction And Land Development [Member]
Current	26,117		17,432
31-60 days past due	0		7,701
61-90 days past due	814		0
Over 90 days past due	13,781		36,412
Total covered loans acquired	115,126		105,805
Covered Loans [Member] | Non-Commercial Loans [Member] | Construction And Land Development [Member] | Pass [Member]
Total covered loans acquired	7,791		0
Covered Loans [Member] | Non-Commercial Loans [Member] | Construction And Land Development [Member] | Special Mention [Member]
Total covered loans acquired	23,955		3,549
Covered Loans [Member] | Non-Commercial Loans [Member] | Construction And Land Development [Member] | Substandard [Member]
Total covered loans acquired	60,957		67,594
Covered Loans [Member] | Non-Commercial Loans [Member] | Construction And Land Development [Member] | Doubtful [Member]
Total covered loans acquired	22,422		34,662
Covered Loans [Member] | Non-Commercial Loans [Member] | Construction And Land Development [Member] | Ungraded [Member]
Total covered loans acquired	1		0
Covered Loans [Member] | Commercial Mortgage [Member]
Current	1,059,874		816,421
31-60 days past due	23,027		43,570
61-90 days past due	20,511		20,308
Over 90 days past due	81,292		88,525
Total covered loans acquired	1,310,083		1,089,064
Covered Loans [Member] | Commercial Mortgage [Member] | Pass [Member]
Total covered loans acquired	486,673		430,526
Covered Loans [Member] | Commercial Mortgage [Member] | Special Mention [Member]
Total covered loans acquired	342,876		261,273
Covered Loans [Member] | Commercial Mortgage [Member] | Substandard [Member]
Total covered loans acquired	395,806		326,036
Covered Loans [Member] | Commercial Mortgage [Member] | Doubtful [Member]
Total covered loans acquired	81,984		71,175
Covered Loans [Member] | Commercial Mortgage [Member] | Ungraded [Member]
Total covered loans acquired	2,744		54
Covered Loans [Member] | Other Commercial Real Estate [Member]
Current	107,242		138,019
31-60 days past due	4,891		15,008
61-90 days past due	0		2,477
Over 90 days past due	6,360		20,453
Total covered loans acquired	159,007		210,661
Covered Loans [Member] | Other Commercial Real Estate [Member] | Pass [Member]
Total covered loans acquired	48,460		77,162
Covered Loans [Member] | Other Commercial Real Estate [Member] | Special Mention [Member]
Total covered loans acquired	24,951		40,756
Covered Loans [Member] | Other Commercial Real Estate [Member] | Substandard [Member]
Total covered loans acquired	55,083		65,896
Covered Loans [Member] | Other Commercial Real Estate [Member] | Doubtful [Member]
Total covered loans acquired	30,513		26,847
Covered Loans [Member] | Other Commercial Real Estate [Member] | Ungraded [Member]
Total covered loans acquired	0		0
Covered Loans [Member] | Residential Mortgage [Member]
Current	303,185		53,679
31-60 days past due	3,598		4,459
61-90 days past due	1,937		1,352
Over 90 days past due	26,301		3,979
Total covered loans acquired	380,405		74,495
Covered Loans [Member] | Residential Mortgage [Member] | Pass [Member]
Total covered loans acquired	226,160		39,492
Covered Loans [Member] | Residential Mortgage [Member] | Special Mention [Member]
Total covered loans acquired	25,686		17,041
Covered Loans [Member] | Residential Mortgage [Member] | Substandard [Member]
Total covered loans acquired	68,289		11,609
Covered Loans [Member] | Residential Mortgage [Member] | Doubtful [Member]
Total covered loans acquired	11,129		6,353
Covered Loans [Member] | Residential Mortgage [Member] | Ungraded [Member]
Total covered loans acquired	49,141		0
Covered Loans [Member] | Revolving Mortgage [Member]
Current	29,366		8,747
31-60 days past due	404		382
61-90 days past due	0		0
Over 90 days past due	0		337
Total covered loans acquired	39,709		17,866
Covered Loans [Member] | Revolving Mortgage [Member] | Pass [Member]
Total covered loans acquired	15,547		5,051
Covered Loans [Member] | Revolving Mortgage [Member] | Special Mention [Member]
Total covered loans acquired	316		3,630
Covered Loans [Member] | Revolving Mortgage [Member] | Substandard [Member]
Total covered loans acquired	6,930		3,462
Covered Loans [Member] | Revolving Mortgage [Member] | Doubtful [Member]
Total covered loans acquired	1,690		1,837
Covered Loans [Member] | Revolving Mortgage [Member] | Ungraded [Member]
Total covered loans acquired	15,226		3,886
Covered Loans [Member] | Commercial And Industrial [Member]
Current	96,672		79,444
31-60 days past due	3,145		9,267
61-90 days past due	1,687		5,899
Over 90 days past due	5,138		28,780
Total covered loans acquired	137,253		132,477
Covered Loans [Member] | Commercial And Industrial [Member] | Pass [Member]
Total covered loans acquired	46,898		46,450
Covered Loans [Member] | Commercial And Industrial [Member] | Special Mention [Member]
Total covered loans acquired	34,894		36,566
Covered Loans [Member] | Commercial And Industrial [Member] | Substandard [Member]
Total covered loans acquired	31,213		41,936
Covered Loans [Member] | Commercial And Industrial [Member] | Doubtful [Member]
Total covered loans acquired	24,248		7,525
Covered Loans [Member] | Commercial And Industrial [Member] | Ungraded [Member]
Total covered loans acquired	0		0
Covered Loans [Member] | Lease Financing [Member]
Current	162		0
31-60 days past due	0		0
61-90 days past due	0		0
Over 90 days past due	0		0
Total covered loans acquired	162		0
Covered Loans [Member] | Lease Financing [Member] | Pass [Member]
Total covered loans acquired	162		0
Covered Loans [Member] | Lease Financing [Member] | Special Mention [Member]
Total covered loans acquired	0		0
Covered Loans [Member] | Lease Financing [Member] | Substandard [Member]
Total covered loans acquired	0		0
Covered Loans [Member] | Lease Financing [Member] | Doubtful [Member]
Total covered loans acquired	0		0
Covered Loans [Member] | Lease Financing [Member] | Ungraded [Member]
Total covered loans acquired	0		0
Covered Loans [Member] | Pass [Member]
Total covered loans acquired	879,689		703,426
Covered Loans [Member] | Pass [Member] | Consumer And Other [Member]
Total covered loans acquired	4,147		6,296
Covered Loans [Member] | Special Mention [Member]
Total covered loans acquired	551,215		454,249
Covered Loans [Member] | Special Mention [Member] | Consumer And Other [Member]
Total covered loans acquired	577		1,231
Covered Loans [Member] | Substandard [Member]
Total covered loans acquired	753,201		596,855
Covered Loans [Member] | Substandard [Member] | Consumer And Other [Member]
Total covered loans acquired	797		691
Covered Loans [Member] | Doubtful [Member]
Total covered loans acquired	298,874		248,974
Covered Loans [Member] | Doubtful [Member] | Consumer And Other [Member]
Total covered loans acquired	1,122		438
Covered Loans [Member] | Ungraded [Member]
Total covered loans acquired	74,471		3,948
Covered Loans [Member] | Ungraded [Member] | Consumer And Other [Member]
Total covered loans acquired	3,404		8
Covered Loans [Member] | Consumer And Other [Member]
Current	7,354		5,607
31-60 days past due	245		430
61-90 days past due	154		1,649
Over 90 days past due	1,139		978
Total covered loans acquired	10,047		8,664
Noncovered Loans [Member]
Current	11,517,387		11,335,240
31-60 days past due	30,157		63,711
61-90 days past due	10,475		24,937
Over 90 days past due	45,507		56,689
Noncovered Loans [Member] | Commercial Loans [Member] | Construction And Land Development [Member]
Current	412,993		325,582
31-60 days past due	1,506		3,047
61-90 days past due	131		6,092
Over 90 days past due	2,089		4,208
Noncovered Loans [Member] | Non-Commercial Loans [Member]
Current	3,743,690		3,833,900
31-60 days past due	12,863		30,976
61-90 days past due	5,307		9,345
Over 90 days past due	23,971		27,061
Noncovered loans	3,785,831		3,901,282
Noncovered Loans [Member] | Non-Commercial Loans [Member] | Construction And Land Development [Member]
Current	134,467		187,918
31-60 days past due	4,204		1,445
61-90 days past due	0		548
Over 90 days past due	514		3,043
Noncovered loans	139,185		192,954
Noncovered Loans [Member] | Non-Commercial Loans [Member] | Residential Mortgage [Member]
Current	795,578		840,328
31-60 days past due	2,303		13,051
61-90 days past due	3,022		4,762
Over 90 days past due	15,835		20,651
Noncovered loans	816,738		878,792
Noncovered Loans [Member] | Non-Commercial Loans [Member] | Revolving Mortgage [Member]
Current	2,291,490		2,226,427
31-60 days past due	3,987		3,682
61-90 days past due	924		1,424
Over 90 days past due	6,081		2,320
Noncovered loans	2,302,482		2,233,853
Noncovered Loans [Member] | Non-Commercial Loans [Member] | Consumer [Member]
Current	522,155		579,227
31-60 days past due	2,369		12,798
61-90 days past due	1,361		2,611
Over 90 days past due	1,541		1,047
Noncovered loans	527,426		595,683
Noncovered Loans [Member] | Commercial Mortgage [Member]
Current	4,962,052		4,687,003
31-60 days past due	13,381		22,913
61-90 days past due	3,765		7,521
Over 90 days past due	16,838		20,425
Noncovered Loans [Member] | Other Commercial Real Estate [Member]
Current	143,480		148,764
31-60 days past due	93		35
61-90 days past due	0		290
Over 90 days past due	965		621
Noncovered Loans [Member] | Residential Mortgage [Member]
Current	795,578		840,328
31-60 days past due	2,303		13,051
61-90 days past due	3,022		4,762
Over 90 days past due	15,835		20,651
Noncovered Loans [Member] | Revolving Mortgage [Member]
Current	2,291,490		2,226,427
31-60 days past due	3,987		3,682
61-90 days past due	924		1,424
Over 90 days past due	6,081		2,320
Noncovered Loans [Member] | Commercial And Industrial [Member]
Current	1,793,524		1,859,839
31-60 days past due	1,417		4,434
61-90 days past due	1,092		1,473
Over 90 days past due	1,548		3,744
Noncovered Loans [Member] | Consumer [Member]
Current	522,155		579,227
31-60 days past due	2,369		12,798
61-90 days past due	1,361		2,611
Over 90 days past due	1,541		1,047
Noncovered Loans [Member] | Lease Financing [Member]
Current	302,884		298,252
31-60 days past due	879		2,266
61-90 days past due	180		141
Over 90 days past due	96		630
Noncovered Loans [Member] | Other Loans [Member]
Current	158,764		181,900
31-60 days past due	18		40
61-90 days past due	0		75
Over 90 days past due	0		0
Commercial Loans [Member] | Construction And Land Development [Member] | Pass [Member]
Noncovered loans	371,906		285,988
Commercial Loans [Member] | Commercial Mortgage [Member] | Pass [Member]
Noncovered loans	4,632,698		4,390,634
Commercial Loans [Member] | Other Commercial Real Estate [Member] | Pass [Member]
Noncovered loans	130,591		137,570
Commercial Loans [Member] | Commercial And Industrial [Member] | Pass [Member]
Noncovered loans	1,585,106		1,633,775
Commercial Loans [Member] | Lease Financing [Member] | Pass [Member]
Noncovered loans	296,420		291,476
Commercial Loans [Member] | Other Loans [Member] | Pass [Member]
Noncovered loans	157,742		181,044
Commercial Loans [Member] | Pass [Member]
Noncovered loans	7,174,463		6,920,487
Commercial Loans [Member] | Construction And Land Development [Member] | Special Mention [Member]
Noncovered loans	18,431		20,957
Commercial Loans [Member] | Commercial Mortgage [Member] | Special Mention [Member]
Noncovered loans	232,537		229,581
Commercial Loans [Member] | Other Commercial Real Estate [Member] | Special Mention [Member]
Noncovered loans	8,672		6,531
Commercial Loans [Member] | Commercial And Industrial [Member] | Special Mention [Member]
Noncovered loans	38,844		42,639
Commercial Loans [Member] | Lease Financing [Member] | Special Mention [Member]
Noncovered loans	4,765		6,888
Commercial Loans [Member] | Other Loans [Member] | Special Mention [Member]
Noncovered loans	1,020		846
Commercial Loans [Member] | Special Mention [Member]
Noncovered loans	304,269		307,442
Commercial Loans [Member] | Construction And Land Development [Member] | Substandard [Member]
Noncovered loans	26,249		29,714
Commercial Loans [Member] | Commercial Mortgage [Member] | Substandard [Member]
Noncovered loans	123,968		108,239
Commercial Loans [Member] | Other Commercial Real Estate [Member] | Substandard [Member]
Noncovered loans	4,629		5,103
Commercial Loans [Member] | Commercial And Industrial [Member] | Substandard [Member]
Noncovered loans	27,700		24,686
Commercial Loans [Member] | Lease Financing [Member] | Substandard [Member]
Noncovered loans	2,854		2,496
Commercial Loans [Member] | Other Loans [Member] | Substandard [Member]
Noncovered loans	0		90
Commercial Loans [Member] | Substandard [Member]
Noncovered loans	185,400		170,328
Commercial Loans [Member] | Construction And Land Development [Member] | Doubtful [Member]
Noncovered loans	133		2,270
Commercial Loans [Member] | Commercial Mortgage [Member] | Doubtful [Member]
Noncovered loans	4,307		7,928
Commercial Loans [Member] | Other Commercial Real Estate [Member] | Doubtful [Member]
Noncovered loans	401		401
Commercial Loans [Member] | Commercial And Industrial [Member] | Doubtful [Member]
Noncovered loans	270		748
Commercial Loans [Member] | Lease Financing [Member] | Doubtful [Member]
Noncovered loans	0		414
Commercial Loans [Member] | Other Loans [Member] | Doubtful [Member]
Noncovered loans	0		0
Commercial Loans [Member] | Doubtful [Member]
Noncovered loans	5,111		11,761
Commercial Loans [Member] | Construction And Land Development [Member] | Ungraded [Member]
Noncovered loans	0		0
Commercial Loans [Member] | Commercial Mortgage [Member] | Ungraded [Member]
Noncovered loans	2,526		1,480
Commercial Loans [Member] | Other Commercial Real Estate [Member] | Ungraded [Member]
Noncovered loans	245		105
Commercial Loans [Member] | Commercial And Industrial [Member] | Ungraded [Member]
Noncovered loans	145,661		167,642
Commercial Loans [Member] | Lease Financing [Member] | Ungraded [Member]
Noncovered loans	0		15
Commercial Loans [Member] | Other Loans [Member] | Ungraded [Member]
Noncovered loans	20		35
Commercial Loans [Member] | Ungraded [Member]
Noncovered loans	148,452		169,277
Commercial Loans [Member] | Construction And Land Development [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	172,309		102,988		136,736
Commercial Loans [Member] | Commercial Mortgage [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	125,379		120,240		132,049
Commercial Loans [Member] | Other Commercial Real Estate [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	40,514		34,704		43,023
Commercial Loans [Member] | Commercial And Industrial [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	30,611		9,087		14,400
Commercial Loans [Member] | Lease Financing [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	0		0		0
Commercial Loans [Member] | Other Loans [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	0		0		147
Commercial Loans [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	368,813		267,019		326,355
Non-Commercial Loans [Member] | Construction And Land Development [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	74,414		44,260		37,228
Non-Commercial Loans [Member] | Residential Mortgage [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	45,384		11,026		36,933
Non-Commercial Loans [Member] | Revolving Mortgage [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	9,939		8,400		114
Non-Commercial Loans [Member] | Consumer [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	1,155		0		116
Non-Commercial Loans [Member] | Impaired At Acquisition Date [Member]
Total covered loans acquired	130,892		63,686		74,391
Impaired At Acquisition Date [Member]
Total covered loans acquired	499,705		330,705		400,746
Commercial Loans [Member] | Construction And Land Development [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	233,349		265,432		312,063
Commercial Loans [Member] | Commercial Mortgage [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	1,184,704		968,824		999,134
Commercial Loans [Member] | Other Commercial Real Estate [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	118,493		175,957		177,001
Commercial Loans [Member] | Commercial And Industrial [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	106,642		123,390		168,505
Commercial Loans [Member] | Lease Financing [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	162		0		0
Commercial Loans [Member] | Other Loans [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	1,473		1,510		4,534
Commercial Loans [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	1,644,823		1,535,113		1,661,237
Non-Commercial Loans [Member] | Construction And Land Development [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	40,712		61,545		84,964
Non-Commercial Loans [Member] | Residential Mortgage [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	335,021		63,469		45,836
Non-Commercial Loans [Member] | Revolving Mortgage [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	29,770		9,466		23,025
Non-Commercial Loans [Member] | Consumer [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	7,419		7,154		6,852
Non-Commercial Loans [Member] | All Other Acquired Loans [Member]
Total covered loans acquired	412,922		141,634		160,677
All Other Acquired Loans [Member]
Total covered loans acquired	2,057,745		1,676,747		1,821,914
Commercial Loans [Member] | Construction And Land Development [Member]
Noncovered loans	416,719		338,929		433,954
Total covered loans acquired	405,658		368,420		448,799
Non-Commercial Loans [Member] | Construction And Land Development [Member]
Noncovered loans	139,185		192,954		112,116
Total covered loans acquired	115,126		105,805		122,192
Commercial Loans [Member] | Commercial Mortgage [Member]
Noncovered loans	4,996,036		4,737,862		4,696,183
Total covered loans acquired	1,310,083		1,089,064		1,131,183
Commercial Loans [Member] | Other Commercial Real Estate [Member]
Noncovered loans	144,538		149,710		155,509
Total covered loans acquired	159,007		210,661		220,024
Commercial Loans [Member] | Commercial And Industrial [Member]
Noncovered loans	1,797,581		1,869,490		1,774,340
Total covered loans acquired	137,253		132,477		182,905
Commercial Loans [Member] | Lease Financing [Member]
Noncovered loans	304,039		301,289		294,825
Total covered loans acquired	162		0		0
Non-Commercial Loans [Member] | Residential Mortgage [Member]
Noncovered loans	816,738		878,792		917,415
Total covered loans acquired	380,405		74,495		82,769
Non-Commercial Loans [Member] | Revolving Mortgage [Member]
Noncovered loans	2,302,482		2,233,853		2,209,149
Total covered loans acquired	39,709		17,866		23,139
Non-Commercial Loans [Member] | Consumer [Member]
Noncovered loans	527,426		595,683		766,586
Total covered loans acquired	8,574		7,154		6,968
Commercial Loans [Member] | Other Loans [Member]
Noncovered loans	158,782		182,015		185,232
Total covered loans acquired	1,473		1,510		4,681
Commercial Loans [Member]
Noncovered loans	7,817,695		7,579,295		7,540,043
Total covered loans acquired	2,013,636		1,802,132		1,987,592
Non-Commercial Loans [Member]
Noncovered loans	3,785,831		3,901,282		4,005,266
Total covered loans acquired	$ 543,814		$ 205,320		$ 235,068

[1] Unaudited

[2] Derived from 2010 Annual Report on Form 10-K.