Loans, Allowance for Loan Losses, and Credit Quality (Details 7) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 413,963	$ 469,936
Unpaid Principal Balance	508,548	573,912
Related Allowance	85,821	104,779
Average Recorded Investment	429,051	522,649
Interest Income Recognized	9,028	13,414
Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	335,970	348,717
Unpaid Principal Balance	392,681	397,986
Related Allowance	85,821	104,779
Average Recorded Investment	343,301	376,527
Interest Income Recognized	8,623	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	77,993	121,219
Unpaid Principal Balance	115,867	175,926
Related Allowance	0	0
Average Recorded Investment	85,750	146,122
Interest Income Recognized	405	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	76,709	78,627
Unpaid Principal Balance	91,915	93,576
Related Allowance	15,392	15,307
Average Recorded Investment	74,803	88,556
Interest Income Recognized	2,231	2,797
Commercial And Industrial Financing Receivable [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	64,379	57,380
Unpaid Principal Balance	71,469	65,945
Related Allowance	15,392	15,307
Average Recorded Investment	61,871	65,042
Interest Income Recognized	2,133	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	12,330	21,247
Unpaid Principal Balance	20,446	27,631
Related Allowance	0	0
Average Recorded Investment	12,932	23,514
Interest Income Recognized	98	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	42,867	43,856
Unpaid Principal Balance	50,497	51,647
Related Allowance	5,763	7,570
Average Recorded Investment	44,909	47,547
Interest Income Recognized	998	787
Commercial Real Estate Owner Occupied Portfolio [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	28,651	27,456
Unpaid Principal Balance	33,207	31,221
Related Allowance	5,763	7,570
Average Recorded Investment	29,659	28,938
Interest Income Recognized	801	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	14,216	16,400
Unpaid Principal Balance	17,290	20,426
Related Allowance	0	0
Average Recorded Investment	15,250	18,609
Interest Income Recognized	197	200
Finance Leases Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	5,927	10,644
Unpaid Principal Balance	5,927	10,644
Related Allowance	22	195
Average Recorded Investment	8,193	13,228
Interest Income Recognized	0	40
Finance Leases Financing Receivable [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	541	1,176
Unpaid Principal Balance	541	1,176
Related Allowance	22	195
Average Recorded Investment	629	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	5,386	9,468
Unpaid Principal Balance	5,386	9,468
Related Allowance	0	0
Average Recorded Investment	7,564	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	125,503	133,127
Unpaid Principal Balance	148,339	155,867
Related Allowance	21,177	23,072
Average Recorded Investment	127,905	149,331
Interest Income Recognized	3,229	3,624
Commercial And Business Lending [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	93,571	86,012
Unpaid Principal Balance	105,217	98,342
Related Allowance	21,177	23,072
Average Recorded Investment	92,159	95,772
Interest Income Recognized	2,934	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	31,932	47,115
Unpaid Principal Balance	43,122	57,525
Related Allowance	0	0
Average Recorded Investment	35,746	53,559
Interest Income Recognized	295	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	120,771	142,769
Unpaid Principal Balance	154,728	181,341
Related Allowance	16,266	25,001
Average Recorded Investment	124,100	158,089
Interest Income Recognized	2,560	3,794
Commercial Real Estate Investor Portfolio Segment [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	99,242	101,704
Unpaid Principal Balance	122,537	117,469
Related Allowance	16,266	25,001
Average Recorded Investment	100,899	107,153
Interest Income Recognized	2,514	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	21,529	41,065
Unpaid Principal Balance	32,191	63,872
Related Allowance	0	0
Average Recorded Investment	23,201	50,936
Interest Income Recognized	46	242
Commercial Real Estate Construction Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	35,245	52,783
Unpaid Principal Balance	56,100	80,316
Related Allowance	4,725	9,185
Average Recorded Investment	37,925	66,348
Interest Income Recognized	295	1,550
Commercial Real Estate Construction Financing Receivable [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	19,393	30,100
Unpaid Principal Balance	26,048	38,680
Related Allowance	4,725	9,185
Average Recorded Investment	20,931	35,411
Interest Income Recognized	273	1,220
Commercial Real Estate Construction 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	15,852	22,683
Unpaid Principal Balance	30,052	41,636
Related Allowance	0	0
Average Recorded Investment	16,994	30,937
Interest Income Recognized	22	330
Commercial Real Estate Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	156,016	195,552
Unpaid Principal Balance	210,828	261,657
Related Allowance	20,991	34,186
Average Recorded Investment	162,025	224,437
Interest Income Recognized	2,855	5,344
Commercial Real Estate Lending [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	118,635	131,804
Unpaid Principal Balance	148,585	156,149
Related Allowance	20,991	34,186
Average Recorded Investment	121,830	142,564
Interest Income Recognized	2,787	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	37,381	63,748
Unpaid Principal Balance	62,243	105,508
Related Allowance	0	0
Average Recorded Investment	40,195	81,873
Interest Income Recognized	68	572
Commercial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	281,519	328,679
Unpaid Principal Balance	359,167	417,524
Related Allowance	42,168	57,258
Average Recorded Investment	289,930	373,768
Interest Income Recognized	6,084	8,968
Commercial Financing Receivable [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	212,206	217,816
Unpaid Principal Balance	253,802	254,491
Related Allowance	42,168	57,258
Average Recorded Investment	213,989	238,336
Interest Income Recognized	5,721	7,664
Commercial 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	69,313	110,863
Unpaid Principal Balance	105,365	163,033
Related Allowance	0	0
Average Recorded Investment	75,941	135,432
Interest Income Recognized	363	1,304
Home Equity [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	47,934	55,857
Unpaid Principal Balance	55,608	63,308
Related Allowance	25,231	30,836
Average Recorded Investment	51,201	59,383
Interest Income Recognized	1,278	1,915
Home Equity [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	46,117	52,756
Unpaid Principal Balance	53,402	58,221
Related Allowance	25,231	30,836
Average Recorded Investment	49,216	56,069
Interest Income Recognized	1,276	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	1,817	3,101
Unpaid Principal Balance	2,206	5,087
Related Allowance	0	0
Average Recorded Investment	1,985	3,314
Interest Income Recognized	2	6
Installment [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	3,565	3,730
Unpaid Principal Balance	3,939	4,059
Related Allowance	2,311	2,021
Average Recorded Investment	3,812	4,135
Interest Income Recognized	121	217
Installment [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	3,565	3,730
Unpaid Principal Balance	3,939	4,059
Related Allowance	2,311	2,021
Average Recorded Investment	3,812	4,135
Interest Income Recognized	121	217
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	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Consumer Retail Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	51,499	59,587
Unpaid Principal Balance	59,547	67,367
Related Allowance	27,542	32,857
Average Recorded Investment	55,013	63,518
Interest Income Recognized	1,399	2,132
Consumer Retail Financing Receivable [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	49,682	56,486
Unpaid Principal Balance	57,341	62,280
Related Allowance	27,542	32,857
Average Recorded Investment	53,028	60,204
Interest Income Recognized	1,397	2,126
Consumer Retail 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	1,817	3,101
Unpaid Principal Balance	2,206	5,087
Related Allowance	0	0
Average Recorded Investment	1,985	3,314
Interest Income Recognized	2	6
Residential, Prime, Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	80,945	81,670
Unpaid Principal Balance	89,834	89,021
Related Allowance	16,111	14,664
Average Recorded Investment	84,108	85,363
Interest Income Recognized	1,545	2,314
Residential, Prime, Financing Receivable [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	74,082	74,415
Unpaid Principal Balance	81,538	81,215
Related Allowance	16,111	14,664
Average Recorded Investment	76,284	77,987
Interest Income Recognized	1,505	2,197
Residential, Prime, 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	6,863	7,255
Unpaid Principal Balance	8,296	7,806
Related Allowance	0	0
Average Recorded Investment	7,824	7,376
Interest Income Recognized	40	117
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	132,444	141,257
Unpaid Principal Balance	149,381	156,388
Related Allowance	43,653	47,521
Average Recorded Investment	139,121	148,881
Interest Income Recognized	2,944	4,446
Consumer Loan [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	123,764	130,901
Unpaid Principal Balance	138,879	143,495
Related Allowance	43,653	47,521
Average Recorded Investment	129,312	138,191
Interest Income Recognized	2,902	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	8,680	10,356
Unpaid Principal Balance	10,502	12,893
Related Allowance	0	0
Average Recorded Investment	9,809	10,690
Interest Income Recognized	$ 42	$ 123