Loans, Allowance for Loan Losses, and Credit Quality (Details 8) (USD $) In Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 567,954	$ 654,291
Unpaid Principal Balance	673,977	748,786
Related Allowance	127,710	144,390
Average Recorded Investment	606,833	701,930
Interest Income Recognized	6,075	15,917
Commercial and industrial financing receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	93,943	109,825
Unpaid Principal Balance	111,770	136,138
Related Allowance	20,609	29,900
Average Recorded Investment	103,574	122,797
Interest Income Recognized	1,665	3,205
Commercial and industrial financing receivable [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	72,756	80,507
Unpaid Principal Balance	85,050	100,297
Related Allowance	20,609	29,900
Average Recorded Investment	81,789	93,966
Interest Income Recognized	1,314	2,399
Commercial and industrial financing receivable [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	21,187	29,318
Unpaid Principal Balance	26,720	35,841
Related Allowance	0	0
Average Recorded Investment	21,785	28,831
Interest Income Recognized	351	806
Commercial real estate [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	229,686	239,539
Unpaid Principal Balance	269,056	271,686
Related Allowance	38,588	33,487
Average Recorded Investment	243,597	258,147
Interest Income Recognized	1,985	5,427
Commercial real estate [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	169,017	137,808
Unpaid Principal Balance	194,532	151,723
Related Allowance	38,588	33,487
Average Recorded Investment	176,767	146,880
Interest Income Recognized	1,385	3,224
Commercial real estate [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	60,669	101,731
Unpaid Principal Balance	74,524	119,963
Related Allowance	0	0
Average Recorded Investment	66,830	111,267
Interest Income Recognized	600	2,203
Real estate construction [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	83,488	117,461
Unpaid Principal Balance	114,386	143,835
Related Allowance	17,818	29,098
Average Recorded Investment	92,095	119,425
Interest Income Recognized	548	2,403
Real estate construction [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	62,404	77,312
Unpaid Principal Balance	78,171	85,173
Related Allowance	17,818	29,098
Average Recorded Investment	68,221	64,049
Interest Income Recognized	416	920
Real estate construction [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	21,084	40,149
Unpaid Principal Balance	36,215	58,662
Related Allowance	0	0
Average Recorded Investment	23,874	55,376
Interest Income Recognized	132	1,483
Finance Leases Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	12,898	17,080
Unpaid Principal Balance	12,898	17,080
Related Allowance	49	6,364
Average Recorded Investment	14,279	19,577
Interest Income Recognized	0	74
Finance Leases Financing Receivable [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,213	16,680
Unpaid Principal Balance	1,213	16,680
Related Allowance	49	6,364
Average Recorded Investment	1,689	18,832
Interest Income Recognized	0	74
Finance Leases Financing Receivable [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	11,685	400
Unpaid Principal Balance	11,685	400
Related Allowance	0	0
Average Recorded Investment	12,590	745
Interest Income Recognized	0	0
Total commercial [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	420,015	483,905
Unpaid Principal Balance	508,110	568,739
Related Allowance	77,064	98,849
Average Recorded Investment	453,545	519,946
Interest Income Recognized	4,198	11,109
Total commercial [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	305,390	312,307
Unpaid Principal Balance	358,966	353,873
Related Allowance	77,064	98,849
Average Recorded Investment	328,466	323,727
Interest Income Recognized	3,115	6,617
Total commercial [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	114,625	171,598
Unpaid Principal Balance	149,144	214,866
Related Allowance	0	0
Average Recorded Investment	125,079	196,219
Interest Income Recognized	1,083	4,492
Home equity [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	58,230	63,453
Unpaid Principal Balance	66,346	65,377
Related Allowance	34,457	28,933
Average Recorded Investment	59,814	66,219
Interest Income Recognized	798	1,754
Home equity [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	52,418	59,975
Unpaid Principal Balance	58,455	61,894
Related Allowance	34,457	28,933
Average Recorded Investment	53,539	62,805
Interest Income Recognized	779	1,652
Home equity [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	5,812	3,478
Unpaid Principal Balance	7,891	3,483
Related Allowance	0	0
Average Recorded Investment	6,275	3,414
Interest Income Recognized	19	102
Installment [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	4,741	11,236
Unpaid Principal Balance	5,166	11,654
Related Allowance	3,213	7,776
Average Recorded Investment	5,008	12,488
Interest Income Recognized	132	294
Installment [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	4,738	11,231
Unpaid Principal Balance	5,163	11,649
Related Allowance	3,213	7,776
Average Recorded Investment	5,005	12,481
Interest Income Recognized	132	294
Installment [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	3	5
Unpaid Principal Balance	3	5
Related Allowance	0	0
Average Recorded Investment	3	7
Interest Income Recognized	0	0
Total retail [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	62,971	74,689
Unpaid Principal Balance	71,512	77,031
Related Allowance	37,670	36,709
Average Recorded Investment	64,822	78,707
Interest Income Recognized	930	2,048
Total retail [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	57,156	71,206
Unpaid Principal Balance	63,618	73,543
Related Allowance	37,670	36,709
Average Recorded Investment	58,544	75,286
Interest Income Recognized	911	1,946
Total retail [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	5,815	3,483
Unpaid Principal Balance	7,894	3,488
Related Allowance	0	0
Average Recorded Investment	6,278	3,421
Interest Income Recognized	19	102
Residential mortgage [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	84,968	95,697
Unpaid Principal Balance	94,355	103,016
Related Allowance	12,976	8,832
Average Recorded Investment	88,466	103,277
Interest Income Recognized	947	2,760
Residential mortgage [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	77,313	86,163
Unpaid Principal Balance	84,376	91,749
Related Allowance	12,976	8,832
Average Recorded Investment	79,601	92,602
Interest Income Recognized	927	2,514
Residential mortgage [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	7,655	9,534
Unpaid Principal Balance	9,979	11,267
Related Allowance	0	0
Average Recorded Investment	8,865	10,675
Interest Income Recognized	20	246
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	147,939	170,386
Unpaid Principal Balance	165,867	180,047
Related Allowance	50,646	45,541
Average Recorded Investment	153,288	181,984
Interest Income Recognized	1,877	4,808
Consumer Loan [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	134,469	157,369
Unpaid Principal Balance	147,994	165,292
Related Allowance	50,646	45,541
Average Recorded Investment	138,145	167,888
Interest Income Recognized	1,838	4,460
Consumer Loan [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	13,470	13,017
Unpaid Principal Balance	17,873	14,755
Related Allowance	0	0
Average Recorded Investment	15,143	14,096
Interest Income Recognized	39	348
Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	439,859	469,676
Unpaid Principal Balance	506,960	519,165
Related Allowance	127,710	144,390
Average Recorded Investment	466,611	491,615
Interest Income Recognized	4,953	11,077
Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	128,095	184,615
Unpaid Principal Balance	167,017	229,621
Related Allowance	0	0
Average Recorded Investment	140,222	210,315
Interest Income Recognized	$ 1,122	$ 4,840