Loans, Allowance for Loan Losses, and Credit Quality Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 324,637	$ 373,955
Unpaid Principal Balance	400,567	455,097
Related Allowance	49,427	69,291
YTD Average Recorded Investment	345,662	399,793
YTD Interest Income Recognized	7,499	11,726
Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	237,917	301,669
Unpaid Principal Balance	280,348	351,382
Related Allowance	49,427	69,291
YTD Average Recorded Investment	250,477	318,019
YTD Interest Income Recognized	6,375	10,903
Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	86,720	72,286
Unpaid Principal Balance	120,219	103,715
Related Allowance	0	0
YTD Average Recorded Investment	95,185	81,774
YTD Interest Income Recognized	1,124	823
Commercial And Industrial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	68,250	67,322
Unpaid Principal Balance	89,051	81,860
Related Allowance	8,132	13,741
YTD Average Recorded Investment	77,310	67,391
YTD Interest Income Recognized	1,806	2,416
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	48,117	57,985
Unpaid Principal Balance	56,577	65,521
Related Allowance	8,132	13,741
YTD Average Recorded Investment	51,752	56,508
YTD Interest Income Recognized	1,215	2,187
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	20,133	9,337
Unpaid Principal Balance	32,474	16,339
Related Allowance	0	0
YTD Average Recorded Investment	25,558	10,883
YTD Interest Income Recognized	591	229
Commercial Real Estate Owner Occupied Portfolio [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	42,726	38,106
Unpaid Principal Balance	47,310	44,282
Related Allowance	3,692	3,811
YTD Average Recorded Investment	44,455	40,956
YTD Interest Income Recognized	978	1,111
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	24,639	24,600
Unpaid Principal Balance	26,548	27,700
Related Allowance	3,692	3,811
YTD Average Recorded Investment	25,947	26,531
YTD Interest Income Recognized	741	1,043
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	18,087	13,506
Unpaid Principal Balance	20,762	16,582
Related Allowance	0	0
YTD Average Recorded Investment	18,508	14,425
YTD Interest Income Recognized	237	68
Finance Leases Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	99	3,031
Unpaid Principal Balance	99	3,031
Related Allowance	41	0
YTD Average Recorded Investment	141	4,016
YTD Interest Income Recognized	0	0
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	99	7
Unpaid Principal Balance	99	7
Related Allowance	41	0
YTD Average Recorded Investment	141	120
YTD Interest Income Recognized	0	0
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	0	3,024
Unpaid Principal Balance	0	3,024
Related Allowance	0	0
YTD Average Recorded Investment	0	3,896
YTD 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	111,075	108,459
Unpaid Principal Balance	136,460	129,173
Related Allowance	11,865	17,552
YTD Average Recorded Investment	121,906	112,363
YTD Interest Income Recognized	2,784	3,527
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	72,855	82,592
Unpaid Principal Balance	83,224	93,228
Related Allowance	11,865	17,552
YTD Average Recorded Investment	77,840	83,159
YTD Interest Income Recognized	1,956	3,230
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	38,220	25,867
Unpaid Principal Balance	53,236	35,945
Related Allowance	0	0
YTD Average Recorded Investment	44,066	29,204
YTD Interest Income Recognized	828	297
Commercial Real Estate Investor Portfolio Segment [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	84,914	100,347
Unpaid Principal Balance	107,843	125,112
Related Allowance	8,328	9,687
YTD Average Recorded Investment	89,614	106,132
YTD Interest Income Recognized	1,856	3,064
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	57,611	80,766
Unpaid Principal Balance	69,331	96,581
Related Allowance	8,328	9,687
YTD Average Recorded Investment	60,358	85,642
YTD Interest Income Recognized	1,717	2,891
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	27,303	19,581
Unpaid Principal Balance	38,512	28,531
Related Allowance	0	0
YTD Average Recorded Investment	29,256	20,490
YTD Interest Income Recognized	139	173
Commercial Real Estate Construction Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	23,495	31,832
Unpaid Principal Balance	33,776	47,035
Related Allowance	2,907	3,411
YTD Average Recorded Investment	25,319	37,472
YTD Interest Income Recognized	221	546
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	10,685	16,299
Unpaid Principal Balance	15,350	22,311
Related Allowance	2,907	3,411
YTD Average Recorded Investment	11,872	19,122
YTD Interest Income Recognized	221	437
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	12,810	15,533
Unpaid Principal Balance	18,426	24,724
Related Allowance	0	0
YTD Average Recorded Investment	13,447	18,350
YTD Interest Income Recognized	0	109
Commercial Real Estate Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	108,409	132,179
Unpaid Principal Balance	141,619	172,147
Related Allowance	11,235	13,098
YTD Average Recorded Investment	114,933	143,604
YTD Interest Income Recognized	2,077	3,610
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	68,296	97,065
Unpaid Principal Balance	84,681	118,892
Related Allowance	11,235	13,098
YTD Average Recorded Investment	72,230	104,764
YTD Interest Income Recognized	1,938	3,328
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	40,113	35,114
Unpaid Principal Balance	56,938	53,255
Related Allowance	0	0
YTD Average Recorded Investment	42,703	38,840
YTD Interest Income Recognized	139	282
Commercial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	219,484	240,638
Unpaid Principal Balance	278,079	301,320
Related Allowance	23,100	30,650
YTD Average Recorded Investment	236,839	255,967
YTD Interest Income Recognized	4,861	7,137
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	141,151	179,657
Unpaid Principal Balance	167,905	212,120
Related Allowance	23,100	30,650
YTD Average Recorded Investment	150,070	187,923
YTD Interest Income Recognized	3,894	6,558
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	78,333	60,981
Unpaid Principal Balance	110,174	89,200
Related Allowance	0	0
YTD Average Recorded Investment	86,769	68,044
YTD Interest Income Recognized	967	579
Home Equity [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	35,302	49,183
Unpaid Principal Balance	41,385	56,725
Related Allowance	13,819	24,580
YTD Average Recorded Investment	36,970	52,498
YTD Interest Income Recognized	1,071	1,998
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	35,044	47,113
Unpaid Principal Balance	41,052	54,456
Related Allowance	13,819	24,580
YTD Average Recorded Investment	36,665	50,334
YTD Interest Income Recognized	1,067	1,962
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	258	2,070
Unpaid Principal Balance	333	2,269
Related Allowance	0	0
YTD Average Recorded Investment	305	2,164
YTD Interest Income Recognized	4	36
Installment [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,685	2,491
Unpaid Principal Balance	2,064	2,847
Related Allowance	557	1,155
YTD Average Recorded Investment	1,935	2,773
YTD Interest Income Recognized	77	172
Installment [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,685	2,491
Unpaid Principal Balance	2,064	2,847
Related Allowance	557	1,155
YTD Average Recorded Investment	1,935	2,773
YTD Interest Income Recognized	77	172
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
YTD Average Recorded Investment	0	0
YTD Interest Income Recognized	0	0
Residential, Prime, Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	68,166	81,643
Unpaid Principal Balance	79,039	94,205
Related Allowance	11,951	12,906
YTD Average Recorded Investment	69,918	88,555
YTD Interest Income Recognized	1,490	2,419
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	60,037	72,408
Unpaid Principal Balance	69,327	81,959
Related Allowance	11,951	12,906
YTD Average Recorded Investment	61,807	76,989
YTD Interest Income Recognized	1,337	2,211
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	8,129	9,235
Unpaid Principal Balance	9,712	12,246
Related Allowance	0	0
YTD Average Recorded Investment	8,111	11,566
YTD Interest Income Recognized	153	208
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	105,153	133,317
Unpaid Principal Balance	122,488	153,777
Related Allowance	26,327	38,641
YTD Average Recorded Investment	108,823	143,826
YTD Interest Income Recognized	2,638	4,589
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	96,766	122,012
Unpaid Principal Balance	112,443	139,262
Related Allowance	26,327	38,641
YTD Average Recorded Investment	100,407	130,096
YTD Interest Income Recognized	2,481	4,345
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	8,387	11,305
Unpaid Principal Balance	10,045	14,515
Related Allowance	0	0
YTD Average Recorded Investment	8,416	13,730
YTD Interest Income Recognized	$ 157	$ 244