Allowance For Loan Losses, Allowance For Losses On Lending-Related Commitments And Impaired Loans (Summary Of Activity In The Allowance For Credit Losses By Loan Portfolio (Excluding Covered Loans)) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Loans and Leases Receivable, Allowance, Beginning Balance	$ 117,362	$ 106,547	$ 113,903	$ 98,277
Other adjustments				1,943
Reclassification to/from allowance for unfunded lending-related commitments	(66)	(206)	1,733	478
Charge-offs	(27,657)	(22,223)	(86,277)	(88,818)
Recoveries	747	786	7,985	2,682
Provision for credit losses	28,263	25,528	81,305	95,870
Loans and Leases Receivable, Allowance, Ending Balance	118,649	110,432	118,649	110,432
Allowance for unfunded lending-related commitments at period end	13,402	2,375	13,402	2,375
Allowance for credit losses, Individually evaluated for impairment	41,360	26,954	41,360	26,954
Allowance for credit losses, Collectively evaluated for impairment	90,691	85,853	90,691	85,853
Financing Receivable, Allowance for Credit Losses	132,051	112,807	132,051	112,807
Allowance for credit losses at period end
Loans, Individually evaluated for impairment	203,570	113,332	203,570	113,332
Loans, Collectively evaluated for impairment	9,433,365	8,582,219	9,433,365	8,582,219
Loans, Loans acquired with deteriorated credit quality	635,776	765,604	635,776	765,604
Commercial [Member]
Loans and Leases Receivable, Allowance, Beginning Balance	32,847	30,716	31,777	28,012
Other adjustments
Reclassification to/from allowance for unfunded lending-related commitments	75		1,606
Charge-offs	(8,851)	(3,076)	(25,574)	(12,532)
Recoveries	150	286	717	873
Provision for credit losses	9,559	4,094	25,254	15,667
Loans and Leases Receivable, Allowance, Ending Balance	33,780	32,020	33,780	32,020
Allowance for unfunded lending-related commitments at period end	45		45
Allowance for credit losses, Individually evaluated for impairment	7,143	7,583	7,143	7,583
Allowance for credit losses, Collectively evaluated for impairment	26,682	24,437	26,682	24,437
Financing Receivable, Allowance for Credit Losses	33,825	32,020	33,825	32,020
Allowance for credit losses at period end
Loans, Individually evaluated for impairment	32,561	21,959	32,561	21,959
Loans, Collectively evaluated for impairment	2,304,537	1,930,832	2,304,537	1,930,832
Commercial Real-Estate [Member]
Loans and Leases Receivable, Allowance, Beginning Balance	61,703	55,464	62,618	50,952
Other adjustments
Reclassification to/from allowance for unfunded lending-related commitments	(141)	(206)	127	478
Charge-offs	(14,734)	(15,727)	(48,767)	(48,281)
Recoveries	299	197	1,100	856
Provision for credit losses	17,245	17,525	49,294	53,248
Loans and Leases Receivable, Allowance, Ending Balance	64,372	57,253	64,372	57,253
Allowance for unfunded lending-related commitments at period end	13,357	2,375	13,357	2,375
Allowance for credit losses, Individually evaluated for impairment	30,000	17,905	30,000	17,905
Allowance for credit losses, Collectively evaluated for impairment	47,729	41,723	47,729	41,723
Financing Receivable, Allowance for Credit Losses	77,729	59,628	77,729	59,628
Allowance for credit losses at period end
Loans, Individually evaluated for impairment	143,975	82,644	143,975	82,644
Loans, Collectively evaluated for impairment	3,321,346	3,248,854	3,321,346	3,248,854
Home Equity [Member]
Loans and Leases Receivable, Allowance, Beginning Balance	7,077	8,366	6,213	9,013
Other adjustments
Charge-offs	(1,071)	(1,234)	(3,144)	(4,604)
Recoveries	32	8	59	22
Provision for credit losses	1,079	1,052	3,989	3,761
Loans and Leases Receivable, Allowance, Ending Balance	7,117	8,192	7,117	8,192
Allowance for credit losses, Individually evaluated for impairment	2,272	763	2,272	763
Allowance for credit losses, Collectively evaluated for impairment	4,845	7,429	4,845	7,429
Financing Receivable, Allowance for Credit Losses	7,117	8,192	7,117	8,192
Allowance for credit losses at period end
Loans, Individually evaluated for impairment	16,367	4,659	16,367	4,659
Loans, Collectively evaluated for impairment	862,813	915,165	862,813	915,165
Residential Real-Estate [Member]
Loans and Leases Receivable, Allowance, Beginning Balance	5,878	3,573	5,107	3,139
Other adjustments
Charge-offs	(926)	(116)	(2,483)	(832)
Recoveries	3	3	8	10
Provision for credit losses	258	807	2,581	1,950
Loans and Leases Receivable, Allowance, Ending Balance	5,213	4,267	5,213	4,267
Allowance for credit losses, Individually evaluated for impairment	1,509	263	1,509	263
Allowance for credit losses, Collectively evaluated for impairment	3,704	4,004	3,704	4,004
Financing Receivable, Allowance for Credit Losses	5,213	4,267	5,213	4,267
Allowance for credit losses at period end
Loans, Individually evaluated for impairment	9,829	3,542	9,829	3,542
Loans, Collectively evaluated for impairment	316,378	338,467	316,378	338,467
Premium Finance Receivable [Member]
Loans and Leases Receivable, Allowance, Beginning Balance	7,436	6,620	6,319	3,816
Other adjustments				1,943
Charge-offs	(1,769)	(1,584)	(5,413)	(21,265)
Recoveries	159	220	5,814	637
Provision for credit losses	1,048	1,209	154	21,334
Loans and Leases Receivable, Allowance, Ending Balance	6,874	6,465	6,874	6,465
Allowance for credit losses, Collectively evaluated for impairment	6,874	6,465	6,874	6,465
Financing Receivable, Allowance for Credit Losses	6,874	6,465	6,874	6,465
Allowance for credit losses at period end
Loans, Collectively evaluated for impairment	2,453,239	1,993,324	2,453,239	1,993,324
Loans, Loans acquired with deteriorated credit quality	635,776	765,604	635,776	765,604
Indirect Consumer [Member]
Loans and Leases Receivable, Allowance, Beginning Balance	613	818	526	1,368
Other adjustments
Charge-offs	(24)	(198)	(188)	(728)
Recoveries	75	29	183	160
Provision for credit losses	(52)	42	91	(109)
Loans and Leases Receivable, Allowance, Ending Balance	612	691	612	691
Allowance for credit losses, Individually evaluated for impairment	7		7
Allowance for credit losses, Collectively evaluated for impairment	605	691	605	691
Financing Receivable, Allowance for Credit Losses	612	691	612	691
Allowance for credit losses at period end
Loans, Individually evaluated for impairment	81	9	81	9
Loans, Collectively evaluated for impairment	62,371	56,566	62,371	56,566
Consumer And Other [Member]
Loans and Leases Receivable, Allowance, Beginning Balance	1,808	990	1,343	1,977
Other adjustments
Charge-offs	(282)	(288)	(708)	(576)
Recoveries	29	43	104	124
Provision for credit losses	(874)	799	(58)	19
Loans and Leases Receivable, Allowance, Ending Balance	681	1,544	681	1,544
Allowance for credit losses, Individually evaluated for impairment	429	440	429	440
Allowance for credit losses, Collectively evaluated for impairment	252	1,104	252	1,104
Financing Receivable, Allowance for Credit Losses	681	1,544	681	1,544
Allowance for credit losses at period end
Loans, Individually evaluated for impairment	757	519	757	519
Loans, Collectively evaluated for impairment	$ 112,681	$ 99,011	$ 112,681	$ 99,011