Loans, Allowance for Loan Losses, and Credit Quality (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 447,804	$ 469,936
Unpaid Principal Balance	562,972	573,912
Related Allowance	101,243	104,779
Average Recorded Investment	460,603	522,649
Interest Income Recognized	2,574	13,414
Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	340,770	348,717
Unpaid Principal Balance	405,222	397,986
Related Allowance	101,243	104,779
Average Recorded Investment	344,080	376,527
Interest Income Recognized	2,451	11,987
Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	107,034	121,219
Unpaid Principal Balance	157,750	175,926
Related Allowance	0	0
Average Recorded Investment	116,523	146,122
Interest Income Recognized	123	1,427
Commercial and industrial financing receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	76,263	78,627
Unpaid Principal Balance	95,096	93,576
Related Allowance	17,143	15,307
Average Recorded Investment	79,983	88,556
Interest Income Recognized	646	2,797
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	64,018	57,380
Unpaid Principal Balance	76,134	65,945
Related Allowance	17,143	15,307
Average Recorded Investment	64,487	65,042
Interest Income Recognized	600	2,265
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	12,245	21,247
Unpaid Principal Balance	18,962	27,631
Related Allowance	0	0
Average Recorded Investment	15,496	23,514
Interest Income Recognized	46	532
Commercial Real Estate Owner Occupied Portfolio [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	38,814	43,856
Unpaid Principal Balance	45,208	51,647
Related Allowance	7,466	7,570
Average Recorded Investment	39,381	47,547
Interest Income Recognized	211	787
Commercial Real Estate Owner Occupied Portfolio [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	27,399	27,456
Unpaid Principal Balance	32,742	31,221
Related Allowance	7,466	7,570
Average Recorded Investment	27,899	28,938
Interest Income Recognized	167	587
Commercial Real Estate Owner Occupied Portfolio [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	11,415	16,400
Unpaid Principal Balance	12,466	20,426
Related Allowance	0	0
Average Recorded Investment	11,482	18,609
Interest Income Recognized	44	200
Finance Leases Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	9,040	10,644
Unpaid Principal Balance	9,040	10,644
Related Allowance	157	195
Average Recorded Investment	9,675	13,228
Interest Income Recognized	0	40
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	1,032	1,176
Unpaid Principal Balance	1,032	1,176
Related Allowance	157	195
Average Recorded Investment	1,060	1,792
Interest Income Recognized	0	40
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	8,008	9,468
Unpaid Principal Balance	8,008	9,468
Related Allowance	0	0
Average Recorded Investment	8,615	11,436
Interest Income Recognized	0	0
Commercial And Business Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	124,117	133,127
Unpaid Principal Balance	149,344	155,867
Related Allowance	24,766	23,072
Average Recorded Investment	129,039	149,331
Interest Income Recognized	857	3,624
Commercial And Business Lending [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	92,449	86,012
Unpaid Principal Balance	109,908	98,342
Related Allowance	24,766	23,072
Average Recorded Investment	93,446	95,772
Interest Income Recognized	767	2,892
Commercial And Business Lending [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	31,668	47,115
Unpaid Principal Balance	39,436	57,525
Related Allowance	0	0
Average Recorded Investment	35,593	53,559
Interest Income Recognized	90	732
Commercial Real Estate Investor Portfolio Segment [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	134,875	142,769
Unpaid Principal Balance	180,031	181,341
Related Allowance	21,311	25,001
Average Recorded Investment	140,398	158,089
Interest Income Recognized	663	3,794
Commercial Real Estate Investor Portfolio Segment [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	88,316	101,704
Unpaid Principal Balance	109,312	117,469
Related Allowance	21,311	25,001
Average Recorded Investment	88,766	107,153
Interest Income Recognized	643	3,552
Commercial Real Estate Investor Portfolio Segment [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	46,559	41,065
Unpaid Principal Balance	70,719	63,872
Related Allowance	0	0
Average Recorded Investment	51,632	50,936
Interest Income Recognized	20	242
Real estate construction
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	48,241	52,783
Unpaid Principal Balance	76,073	80,316
Related Allowance	7,600	9,185
Average Recorded Investment	48,848	66,348
Interest Income Recognized	192	1,550
Real estate construction | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	28,332	30,100
Unpaid Principal Balance	39,911	38,680
Related Allowance	7,600	9,185
Average Recorded Investment	28,673	35,411
Interest Income Recognized	187	1,220
Real estate construction | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	19,909	22,683
Unpaid Principal Balance	36,162	41,636
Related Allowance	0	0
Average Recorded Investment	20,175	30,937
Interest Income Recognized	5	330
Commercial Real Estate Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	183,116	195,552
Unpaid Principal Balance	256,104	261,657
Related Allowance	28,911	34,186
Average Recorded Investment	189,246	224,437
Interest Income Recognized	855	5,344
Commercial Real Estate Lending [Member] | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	116,648	131,804
Unpaid Principal Balance	149,223	156,149
Related Allowance	28,911	34,186
Average Recorded Investment	117,439	142,564
Interest Income Recognized	830	4,772
Commercial Real Estate Lending [Member] | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	66,468	63,748
Unpaid Principal Balance	106,881	105,508
Related Allowance	0	0
Average Recorded Investment	71,807	81,873
Interest Income Recognized	25	572
Total commercial [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	307,233	328,679
Unpaid Principal Balance	405,448	417,524
Related Allowance	53,677	57,258
Average Recorded Investment	318,285	373,768
Interest Income Recognized	1,712	8,968
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	209,097	217,816
Unpaid Principal Balance	259,131	254,491
Related Allowance	53,677	57,258
Average Recorded Investment	210,885	238,336
Interest Income Recognized	1,597	7,664
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	98,136	110,863
Unpaid Principal Balance	146,317	163,033
Related Allowance	0	0
Average Recorded Investment	107,400	135,432
Interest Income Recognized	115	1,304
Home equity [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	53,720	55,857
Unpaid Principal Balance	61,909	63,308
Related Allowance	28,959	30,836
Average Recorded Investment	54,565	59,383
Interest Income Recognized	388	1,915
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	50,315	52,756
Unpaid Principal Balance	56,525	58,221
Related Allowance	28,959	30,836
Average Recorded Investment	51,171	56,069
Interest Income Recognized	388	1,909
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	3,405	3,101
Unpaid Principal Balance	5,384	5,087
Related Allowance	0	0
Average Recorded Investment	3,394	3,314
Interest Income Recognized	0	6
Installment
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	3,626	3,730
Unpaid Principal Balance	4,012	4,059
Related Allowance	2,004	2,021
Average Recorded Investment	3,710	4,135
Interest Income Recognized	45	217
Installment | Loans with a Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	3,626	3,730
Unpaid Principal Balance	4,012	4,059
Related Allowance	2,004	2,021
Average Recorded Investment	3,710	4,135
Interest Income Recognized	45	217
Installment | Loans with No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
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	57,346	59,587
Unpaid Principal Balance	65,921	67,367
Related Allowance	30,963	32,857
Average Recorded Investment	58,275	63,518
Interest Income Recognized	433	2,132
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	53,941	56,486
Unpaid Principal Balance	60,537	62,280
Related Allowance	30,963	32,857
Average Recorded Investment	54,881	60,204
Interest Income Recognized	433	2,126
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	3,405	3,101
Unpaid Principal Balance	5,384	5,087
Related Allowance	0	0
Average Recorded Investment	3,394	3,314
Interest Income Recognized	0	6
Residential mortgage [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	83,225	81,670
Unpaid Principal Balance	91,603	89,021
Related Allowance	16,603	14,664
Average Recorded Investment	84,043	85,363
Interest Income Recognized	429	2,314
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	77,732	74,415
Unpaid Principal Balance	85,554	81,215
Related Allowance	16,603	14,664
Average Recorded Investment	78,314	77,987
Interest Income Recognized	421	2,197
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	5,493	7,255
Unpaid Principal Balance	6,049	7,806
Related Allowance	0	0
Average Recorded Investment	5,729	7,376
Interest Income Recognized	8	117
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	140,571	141,257
Unpaid Principal Balance	157,524	156,388
Related Allowance	47,566	47,521
Average Recorded Investment	142,318	148,881
Interest Income Recognized	862	4,446
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	131,673	130,901
Unpaid Principal Balance	146,091	143,495
Related Allowance	47,566	47,521
Average Recorded Investment	133,195	138,191
Interest Income Recognized	854	4,323
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	8,898	10,356
Unpaid Principal Balance	11,433	12,893
Related Allowance	0	0
Average Recorded Investment	9,123	10,690
Interest Income Recognized	$ 8	$ 123