Allowance For Loan And Lease Losses (Summary Of Activity In Allowance For Loan And Lease Losses) (Details) (USD $) In Thousands									3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2010		Sep. 30, 2011 Construction And Land Development - Commercial [Member]	Dec. 31, 2010 Construction And Land Development - Commercial [Member]	Sep. 30, 2011 Construction And Land Development - Commercial [Member] Covered Loans [Member]	Sep. 30, 2011 Construction And Land Development - Commercial [Member] Covered Loans [Member]	Dec. 31, 2010 Construction And Land Development - Commercial [Member] Covered Loans [Member]	Sep. 30, 2011 Construction And Land Development - Commercial [Member] Noncovered Loans [Member]	Sep. 30, 2011 Construction And Land Development - Commercial [Member] Noncovered Loans [Member]	Dec. 31, 2010 Construction And Land Development - Commercial [Member] Noncovered Loans [Member]	Sep. 30, 2011 Commercial Mortgage [Member]	Dec. 31, 2010 Commercial Mortgage [Member]	Sep. 30, 2011 Commercial Mortgage [Member] Covered Loans [Member]	Sep. 30, 2011 Commercial Mortgage [Member] Covered Loans [Member]	Dec. 31, 2010 Commercial Mortgage [Member] Covered Loans [Member]	Sep. 30, 2011 Commercial Mortgage [Member] Noncovered Loans [Member]	Sep. 30, 2011 Commercial Mortgage [Member] Noncovered Loans [Member]	Dec. 31, 2010 Commercial Mortgage [Member] Noncovered Loans [Member]	Sep. 30, 2011 Other Commercial Real Estate [Member]	Dec. 31, 2010 Other Commercial Real Estate [Member]	Sep. 30, 2011 Other Commercial Real Estate [Member] Covered Loans [Member]	Sep. 30, 2011 Other Commercial Real Estate [Member] Covered Loans [Member]	Dec. 31, 2010 Other Commercial Real Estate [Member] Covered Loans [Member]	Sep. 30, 2011 Other Commercial Real Estate [Member] Noncovered Loans [Member]	Sep. 30, 2011 Other Commercial Real Estate [Member] Noncovered Loans [Member]	Dec. 31, 2010 Other Commercial Real Estate [Member] Noncovered Loans [Member]	Sep. 30, 2011 Commercial And Industrial [Member]	Dec. 31, 2010 Commercial And Industrial [Member]	Sep. 30, 2011 Commercial And Industrial [Member] Covered Loans [Member]	Sep. 30, 2011 Commercial And Industrial [Member] Covered Loans [Member]	Dec. 31, 2010 Commercial And Industrial [Member] Covered Loans [Member]	Sep. 30, 2011 Commercial And Industrial [Member] Noncovered Loans [Member]	Sep. 30, 2011 Commercial And Industrial [Member] Noncovered Loans [Member]	Dec. 31, 2010 Commercial And Industrial [Member] Noncovered Loans [Member]	Sep. 30, 2011 Lease Financing [Member]	Dec. 31, 2010 Lease Financing [Member]	Sep. 30, 2011 Lease Financing [Member] Covered Loans [Member]	Sep. 30, 2011 Lease Financing [Member] Covered Loans [Member]	Dec. 31, 2010 Lease Financing [Member] Covered Loans [Member]	Sep. 30, 2011 Lease Financing [Member] Noncovered Loans [Member]	Sep. 30, 2011 Lease Financing [Member] Noncovered Loans [Member]	Dec. 31, 2010 Lease Financing [Member] Noncovered Loans [Member]	Sep. 30, 2011 Other [Member]	Dec. 31, 2010 Other [Member]	Sep. 30, 2011 Other [Member] Noncovered Loans [Member]	Sep. 30, 2011 Other [Member] Noncovered Loans [Member]	Dec. 31, 2010 Other [Member] Noncovered Loans [Member]	Sep. 30, 2011 Residential Mortgage [Member]	Dec. 31, 2010 Residential Mortgage [Member]	Sep. 30, 2011 Residential Mortgage [Member] Covered Loans [Member]	Sep. 30, 2011 Residential Mortgage [Member] Covered Loans [Member]	Dec. 31, 2010 Residential Mortgage [Member] Covered Loans [Member]	Sep. 30, 2011 Residential Mortgage [Member] Noncovered Loans [Member]	Sep. 30, 2011 Residential Mortgage [Member] Noncovered Loans [Member]	Dec. 31, 2010 Residential Mortgage [Member] Noncovered Loans [Member]	Sep. 30, 2011 Revolving Mortgage [Member] Covered Loans [Member]	Sep. 30, 2011 Revolving Mortgage [Member] Covered Loans [Member]	Dec. 31, 2010 Revolving Mortgage [Member] Covered Loans [Member]	Sep. 30, 2011 Revolving Mortgage [Member] Noncovered Loans [Member]	Sep. 30, 2011 Revolving Mortgage [Member] Noncovered Loans [Member]	Dec. 31, 2010 Revolving Mortgage [Member] Noncovered Loans [Member]	Sep. 30, 2011 Construction And Land Development - Non - Commercial [Member]	Dec. 31, 2010 Construction And Land Development - Non - Commercial [Member]	Sep. 30, 2011 Construction And Land Development - Non - Commercial [Member] Covered Loans [Member]	Sep. 30, 2011 Construction And Land Development - Non - Commercial [Member] Covered Loans [Member]	Dec. 31, 2010 Construction And Land Development - Non - Commercial [Member] Covered Loans [Member]	Sep. 30, 2011 Construction And Land Development - Non - Commercial [Member] Noncovered Loans [Member]	Sep. 30, 2011 Construction And Land Development - Non - Commercial [Member] Noncovered Loans [Member]	Dec. 31, 2010 Construction And Land Development - Non - Commercial [Member] Noncovered Loans [Member]	Sep. 30, 2011 Consumer [Member]	Dec. 31, 2010 Consumer [Member]	Sep. 30, 2011 Consumer [Member] Covered Loans [Member]	Sep. 30, 2011 Consumer [Member] Covered Loans [Member]	Dec. 31, 2010 Consumer [Member] Covered Loans [Member]	Sep. 30, 2011 Consumer [Member] Noncovered Loans [Member]	Sep. 30, 2011 Consumer [Member] Noncovered Loans [Member]	Dec. 31, 2010 Consumer [Member] Noncovered Loans [Member]	Sep. 30, 2011 Non Specific [Member] Noncovered Loans [Member]	Sep. 30, 2011 Non Specific [Member] Noncovered Loans [Member]	Dec. 31, 2010 Non Specific [Member] Noncovered Loans [Member]	Sep. 30, 2011 Covered Loans [Member]	Sep. 30, 2011 Covered Loans [Member]	Dec. 31, 2010 Covered Loans [Member]	Sep. 30, 2011 Noncovered Loans [Member]	Sep. 30, 2011 Noncovered Loans [Member]	Dec. 31, 2010 Noncovered Loans [Member]
Beginning balance	$ 254,184	[1]	$ 227,765	[2]	$ 218,046	[1]	$ 22,001	$ 28,327	$ 24,234	$ 20,654		$ 9,692	$ 10,512		$ 66,588	$ 57,952	$ 22,093	$ 13,199		$ 67,123	$ 64,772		$ 580	$ 964	$ 12,841	$ 4,148		$ 2,268	$ 2,200		$ 14,222	$ 12,989	$ 1,872	$ 6,828		$ 24,918	$ 24,089		$ 339	$ 693	$ 0	$ 0		$ 3,358	$ 3,384		$ 0	$ 76	$ 1,351	$ 1,473		$ 12,033	$ 6,162	$ 3,653	$ 113		$ 7,404	$ 7,009		$ 10	$ 676		$ 22,020	$ 18,016		$ 2,844	$ 514	$ 4,720	$ 5,607		$ 1,324	$ 1,751		$ 992	$ 102	$ 12	$ 23		$ 27,079	$ 29,448		$ 14,078	$ 13,863		$ 69,435	$ 51,248		$ 180,615	$ 176,517
Charge-offs									(10,759)	(20,711)		(6,213)	(6,977)				(8,728)	(32,735)		(1,184)	(3,810)				(2,686)	(14,160)		0	0				(624)	(3,067)		(1,010)	(4,659)				0	0		(77)	(341)				(6)	(43)				(1,409)	(4,143)		(1,624)	(4,026)		0	0		(3,686)	(10,454)				(1,034)	(6,078)		(358)	(1,432)				(15)	(89)		(2,901)	(9,417)		0	0		(25,255)	(80,983)		(17,059)	(41,159)
Recoveries									57	57		74	153				60	75		211	914				386	477		6	17				0	12		236	826				0	0		52	100				1	2				50	94		44	835		0	0		184	530				0	0		12	173					0		447	1,272		0	0		553	715		1,267	4,822
Provision									3,500	17,032		1,613	1,478				16,607	49,493		1,807	6,081				1,879	21,955		(113)	(56)				5,687	3,162		(70)	3,818				1	1		(78)	112				(63)	(149)				1,878	8,108		3,186	5,192		122	(544)		7,099	17,525				584	4,741		448	934				59	122		714	4,036		(232)	(17)		30,317	104,070		14,311	38,954
Ending balance	254,184	[1]	227,765	[2]	218,046	[1]	22,001	28,327	17,032	17,032	20,654	5,166	5,166	10,512	66,588	57,952	30,032	30,032	13,199	67,957	67,957	64,772	580	964	12,420	12,420	4,148	2,161	2,161	2,200	14,222	12,989	6,935	6,935	6,828	24,074	24,074	24,089	339	693	1	1	0	3,255	3,255	3,384	0	76	1,283	1,283	1,473	12,033	6,162	4,172	4,172	113	9,010	9,010	7,009	132	132	676	25,617	25,617	18,016	2,844	514	4,270	4,270	5,607	1,426	1,426	1,751	992	102	56	56	23	25,339	25,339	29,448	13,846	13,846	13,863	75,050	75,050	51,248	179,134	179,134	176,517
ALLL for loans and leases individually evaluated for impairment									4,146	4,146	5,085	310	310	5,883			11,989	11,989	7,331	4,641	4,641	4,601			748	748	151	43	43	67			2,247	2,247	170	433	433	598			0	0	0	25	25	58			0	0	7			1,438	1,438	6	1,025	1,025	384	0	0	0	0	0	0			597	597	221	92	92	13			0	0	0	45	45	9	0	0	0	21,165	21,165	12,964	6,614	6,614	11,620
ALLL for loans and leases collectively evaluated for impairment									2,148	2,148	701	4,856	4,856	4,629			7,245	7,245	2,613	63,316	63,316	60,171			1,313	1,313	549	2,118	2,118	2,133			804	804	363	23,641	23,641	23,491			1	1	0	3,230	3,230	3,326			1,283	1,283	1,466			1,641	1,641	107	7,985	7,985	6,625	132	132	31	25,617	25,617	18,016			230	230	154	1,334	1,334	1,738			56	56	23	25,294	25,294	29,439	0	0	0	13,570	13,570	4,541	158,674	158,674	151,034
ALLL for loans and leases acquired with deteriorated credit quality									10,738	10,738	14,868						10,798	10,798	3,255						10,359	10,359	3,448						3,884	3,884	6,295						0	0	0											1,093	1,093	0				0	0	645						3,443	3,443	5,232						0	0	0							40,315	40,315	33,743
Loans and leases individually evaluated for impairment									81,558	81,558	59,763	22,001	22,001	28,327			174,709	174,709	84,841	66,588	66,588	57,952			28,535	28,535	9,330	580	580	964			5,360	5,360	8,330	14,222	14,222	12,989			0	0	0	339	339	693			0	0	76			17,921	17,921	4,743	12,033	12,033	6,162	0	0	0	0	0	0			11,606	11,606	42,957	2,844	2,844	514			0	0	0	992	992	102	0	0	0	319,689	319,689	209,964	119,599	119,599	107,779
Loans and leases collectively evaluated for impairment									151,791	151,791	205,669	394,718	394,718	310,602			1,009,995	1,009,995	883,983	4,929,448	4,929,448	4,679,910			89,958	89,958	166,627	143,958	143,958	148,746			101,282	101,282	115,060	1,783,359	1,783,359	1,856,501			162	162	0	303,700	303,700	300,596			158,782	158,782	181,939			317,100	317,100	58,726	804,705	804,705	872,630	29,770	29,770	9,466	2,302,482	2,302,482	2,233,853			29,106	29,106	18,588	136,341	136,341	192,440			8,892	8,892	8,664	526,434	526,434	595,581	0	0	0	1,738,056	1,738,056	1,466,783	11,483,927	11,483,927	11,372,798
Loans and leases acquired with deteriorated credit quality									172,309	172,309	102,988						125,379	125,379	120,240						40,514	40,514	34,704						30,611	30,611	9,087						0	0	0											45,384	45,384	11,026				9,939	9,939	8,400						74,414	74,414	44,260						1,155	1,155	0							499,705	499,705	330,705
Non-specific ALLL												0	0	0						0	0	0						0	0	0						0	0	0						0	0	0			0	0	0						0	0	0				0	0	0						0	0	0						0	0	0	13,846	13,846	13,863				13,846	13,846	13,863
Total allowance for loan and lease losses										17,032	20,654		5,166	10,512				30,032	13,199		67,957	64,772				12,420	4,148		2,161	2,200				6,935	6,828		24,074	24,089				1	0		3,255	3,384				1,283	1,473				4,172	113		9,010	7,009		132	676		25,617	18,016				4,270	5,607		1,426	1,751				56	23		25,339	29,448		13,846	13,863		75,050	51,248		179,134	176,517
Net loans and leases	$ 13,906,792	[1]	$ 13,260,264	[2]	$ 13,549,923	[1]			$ 405,658	$ 405,658	$ 368,420	$ 416,719	$ 416,719	$ 338,929			$ 1,310,083	$ 1,310,083	$ 1,089,064	$ 4,996,036	$ 4,996,036	$ 4,737,862			$ 159,007	$ 159,007	$ 210,661	$ 144,538	$ 144,538	$ 149,710			$ 137,253	$ 137,253	$ 132,477	$ 1,797,581	$ 1,797,581	$ 1,869,490			$ 162	$ 162	$ 0	$ 304,039	$ 304,039	$ 301,289			$ 158,782	$ 158,782	$ 182,015			$ 380,405	$ 380,405	$ 74,495	$ 816,738	$ 816,738	$ 878,792	$ 39,709	$ 39,709	$ 17,866	$ 2,302,482	$ 2,302,482	$ 2,233,853			$ 115,126	$ 115,126	$ 105,805	$ 139,185	$ 139,185	$ 192,954			$ 10,047	$ 10,047	$ 8,664	$ 527,426	$ 527,426	$ 595,683	$ 0	$ 0	$ 0	$ 2,557,450	$ 2,557,450	$ 2,007,452	$ 11,603,526	$ 11,603,526	$ 11,480,577

[1] Unaudited

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