Loans And Leases (Aging Of The Outstanding Loans And Leases By Class Excluding Loans Impaired At Acquisition Date) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
31-60 days past due	$ 74,715	$ 208,900
61-90 days past due	42,824	65,607
Greater Than 90 Days	213,084	310,150
Total Past Due	330,623	584,657
Current	13,330,648	12,572,667
Total Loans and Leases	13,661,271	13,157,324
Covered Loans [Member]
31-60 days past due	44,558	145,189
61-90 days past due	32,349	40,670
Greater Than 90 Days	167,577	253,461
Total Past Due	244,484	439,320
Current	1,813,261	1,237,427
Total Loans and Leases	2,057,745	1,676,747
Covered Loans [Member] | Commercial Loans [Member] | Construction And Land Development [Member]
31-60 days past due	9,248	64,372
61-90 days past due	7,246	8,985
Greater Than 90 Days	33,566	73,997
Total Past Due	50,060	147,354
Current	183,289	118,078
Total Loans and Leases	233,349	265,432
Covered Loans [Member] | Non-Commercial Loans [Member] | Construction And Land Development [Member]
31-60 days past due	0	7,701
61-90 days past due	814	0
Greater Than 90 Days	13,781	36,412
Total Past Due	14,595	44,113
Current	26,117	17,432
Total Loans and Leases	40,712	61,545
Covered Loans [Member] | Commercial Mortgage [Member]
31-60 days past due	23,027	43,570
61-90 days past due	20,511	20,308
Greater Than 90 Days	81,292	88,525
Total Past Due	124,830	152,403
Current	1,059,874	816,421
Total Loans and Leases	1,184,704	968,824
Covered Loans [Member] | Other Commercial Real Estate [Member]
31-60 days past due	4,891	15,008
61-90 days past due	0	2,477
Greater Than 90 Days	6,360	20,453
Total Past Due	11,251	37,938
Current	107,242	138,019
Total Loans and Leases	118,493	175,957
Covered Loans [Member] | Residential Mortgage [Member]
31-60 days past due	3,598	4,459
61-90 days past due	1,937	1,352
Greater Than 90 Days	26,301	3,979
Total Past Due	31,836	9,790
Current	303,185	53,679
Total Loans and Leases	335,021	63,469
Covered Loans [Member] | Revolving Mortgage [Member]
31-60 days past due	404	382
61-90 days past due	0	0
Greater Than 90 Days	0	337
Total Past Due	404	719
Current	29,366	8,747
Total Loans and Leases	29,770	9,466
Covered Loans [Member] | Commercial And Industrial [Member]
31-60 days past due	3,145	9,267
61-90 days past due	1,687	5,899
Greater Than 90 Days	5,138	28,780
Total Past Due	9,970	43,946
Current	96,672	79,444
Total Loans and Leases	106,642	123,390
Covered Loans [Member] | Lease Financing [Member]
31-60 days past due	0	0
61-90 days past due	0	0
Greater Than 90 Days	0	0
Total Past Due	0	0
Current	162	0
Total Loans and Leases	162	0
Covered Loans [Member] | Consumer And Other [Member]
31-60 days past due	245	430
61-90 days past due	154	1,649
Greater Than 90 Days	1,139	978
Total Past Due	1,538	3,057
Current	7,354	5,607
Total Loans and Leases	8,892	8,664
Noncovered Loans [Member]
31-60 days past due	30,157	63,711
61-90 days past due	10,475	24,937
Greater Than 90 Days	45,507	56,689
Total Past Due	86,139	145,337
Current	11,517,387	11,335,240
Total Loans and Leases	11,603,526	11,480,577
Noncovered Loans [Member] | Commercial Loans [Member] | Construction And Land Development [Member]
31-60 days past due	1,506	3,047
61-90 days past due	131	6,092
Greater Than 90 Days	2,089	4,208
Total Past Due	3,726	13,347
Current	412,993	325,582
Total Loans and Leases	416,719	338,929
Noncovered Loans [Member] | Non-Commercial Loans [Member]
31-60 days past due	12,863	30,976
61-90 days past due	5,307	9,345
Greater Than 90 Days	23,971	27,061
Current	3,743,690	3,833,900
Noncovered Loans [Member] | Non-Commercial Loans [Member] | Construction And Land Development [Member]
31-60 days past due	4,204	1,445
61-90 days past due	0	548
Greater Than 90 Days	514	3,043
Total Past Due	4,718	5,036
Current	134,467	187,918
Total Loans and Leases	139,185	192,954
Noncovered Loans [Member] | Non-Commercial Loans [Member] | Residential Mortgage [Member]
31-60 days past due	2,303	13,051
61-90 days past due	3,022	4,762
Greater Than 90 Days	15,835	20,651
Current	795,578	840,328
Noncovered Loans [Member] | Non-Commercial Loans [Member] | Revolving Mortgage [Member]
31-60 days past due	3,987	3,682
61-90 days past due	924	1,424
Greater Than 90 Days	6,081	2,320
Current	2,291,490	2,226,427
Noncovered Loans [Member] | Non-Commercial Loans [Member] | Consumer [Member]
31-60 days past due	2,369	12,798
61-90 days past due	1,361	2,611
Greater Than 90 Days	1,541	1,047
Current	522,155	579,227
Noncovered Loans [Member] | Commercial Mortgage [Member]
31-60 days past due	13,381	22,913
61-90 days past due	3,765	7,521
Greater Than 90 Days	16,838	20,425
Total Past Due	33,984	50,859
Current	4,962,052	4,687,003
Total Loans and Leases	4,996,036	4,737,862
Noncovered Loans [Member] | Other Commercial Real Estate [Member]
31-60 days past due	93	35
61-90 days past due	0	290
Greater Than 90 Days	965	621
Total Past Due	1,058	946
Current	143,480	148,764
Total Loans and Leases	144,538	149,710
Noncovered Loans [Member] | Residential Mortgage [Member]
31-60 days past due	2,303	13,051
61-90 days past due	3,022	4,762
Greater Than 90 Days	15,835	20,651
Total Past Due	21,160	38,464
Current	795,578	840,328
Total Loans and Leases	816,738	878,792
Noncovered Loans [Member] | Revolving Mortgage [Member]
31-60 days past due	3,987	3,682
61-90 days past due	924	1,424
Greater Than 90 Days	6,081	2,320
Total Past Due	10,992	7,426
Current	2,291,490	2,226,427
Total Loans and Leases	2,302,482	2,233,853
Noncovered Loans [Member] | Commercial And Industrial [Member]
31-60 days past due	1,417	4,434
61-90 days past due	1,092	1,473
Greater Than 90 Days	1,548	3,744
Total Past Due	4,057	9,651
Current	1,793,524	1,859,839
Total Loans and Leases	1,797,581	1,869,490
Noncovered Loans [Member] | Consumer [Member]
31-60 days past due	2,369	12,798
61-90 days past due	1,361	2,611
Greater Than 90 Days	1,541	1,047
Total Past Due	5,271	16,456
Current	522,155	579,227
Total Loans and Leases	527,426	595,683
Noncovered Loans [Member] | Lease Financing [Member]
31-60 days past due	879	2,266
61-90 days past due	180	141
Greater Than 90 Days	96	630
Total Past Due	1,155	3,037
Current	302,884	298,252
Total Loans and Leases	304,039	301,289
Noncovered Loans [Member] | Other Loans [Member]
31-60 days past due	18	40
61-90 days past due	0	75
Greater Than 90 Days	0	0
Total Past Due	18	115
Current	158,764	181,900
Total Loans and Leases	$ 158,782	$ 182,015