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	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 336,559	$ 373,955
Unpaid Principal Balance	413,103	455,097
Related Allowance	52,824	69,291
Average Recorded Investment	351,390	399,793
Interest Income Recognized	4,422	11,726
Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	260,892	301,669
Unpaid Principal Balance	307,703	351,382
Related Allowance	52,824	69,291
Average Recorded Investment	271,280	318,019
Interest Income Recognized	4,097	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	75,667	72,286
Unpaid Principal Balance	105,400	103,715
Related Allowance	0	0
Average Recorded Investment	80,110	81,774
Interest Income Recognized	325	823
Commercial And Industrial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	61,272	67,322
Unpaid Principal Balance	77,391	81,860
Related Allowance	11,023	13,741
Average Recorded Investment	65,531	67,391
Interest Income Recognized	868	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	54,100	57,985
Unpaid Principal Balance	63,331	65,521
Related Allowance	11,023	13,741
Average Recorded Investment	57,272	56,508
Interest Income Recognized	827	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	7,172	9,337
Unpaid Principal Balance	14,060	16,339
Related Allowance	0	0
Average Recorded Investment	8,259	10,883
Interest Income Recognized	41	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	38,339	38,106
Unpaid Principal Balance	43,604	44,282
Related Allowance	3,111	3,811
Average Recorded Investment	40,056	40,956
Interest Income Recognized	485	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	23,890	24,600
Unpaid Principal Balance	26,742	27,700
Related Allowance	3,111	3,811
Average Recorded Investment	25,362	26,531
Interest Income Recognized	440	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	14,449	13,506
Unpaid Principal Balance	16,862	16,582
Related Allowance	0	0
Average Recorded Investment	14,694	14,425
Interest Income Recognized	45	68
Finance Leases Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	72	3,031
Unpaid Principal Balance	72	3,031
Related Allowance	3	0
Average Recorded Investment	99	4,016
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	72	7
Unpaid Principal Balance	72	7
Related Allowance	3	0
Average Recorded Investment	99	120
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
Average Recorded Investment	0	3,896
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	99,683	108,459
Unpaid Principal Balance	121,067	129,173
Related Allowance	14,137	17,552
Average Recorded Investment	105,686	112,363
Interest Income Recognized	1,353	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	78,062	82,592
Unpaid Principal Balance	90,145	93,228
Related Allowance	14,137	17,552
Average Recorded Investment	82,733	83,159
Interest Income Recognized	1,267	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	21,621	25,867
Unpaid Principal Balance	30,922	35,945
Related Allowance	0	0
Average Recorded Investment	22,953	29,204
Interest Income Recognized	86	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	98,079	100,347
Unpaid Principal Balance	122,689	125,112
Related Allowance	7,796	9,687
Average Recorded Investment	102,383	106,132
Interest Income Recognized	1,176	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	67,040	80,766
Unpaid Principal Balance	78,864	96,581
Related Allowance	7,796	9,687
Average Recorded Investment	68,667	85,642
Interest Income Recognized	1,052	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	31,039	19,581
Unpaid Principal Balance	43,825	28,531
Related Allowance	0	0
Average Recorded Investment	33,716	20,490
Interest Income Recognized	124	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	26,784	31,832
Unpaid Principal Balance	37,094	47,035
Related Allowance	3,139	3,411
Average Recorded Investment	27,814	37,472
Interest Income Recognized	156	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	11,956	16,299
Unpaid Principal Balance	16,376	22,311
Related Allowance	3,139	3,411
Average Recorded Investment	12,565	19,122
Interest Income Recognized	156	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	14,828	15,533
Unpaid Principal Balance	20,718	24,724
Related Allowance	0	0
Average Recorded Investment	15,249	18,350
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	124,863	132,179
Unpaid Principal Balance	159,783	172,147
Related Allowance	10,935	13,098
Average Recorded Investment	130,197	143,604
Interest Income Recognized	1,332	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	78,996	97,065
Unpaid Principal Balance	95,240	118,892
Related Allowance	10,935	13,098
Average Recorded Investment	81,232	104,764
Interest Income Recognized	1,208	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	45,867	35,114
Unpaid Principal Balance	64,543	53,255
Related Allowance	0	0
Average Recorded Investment	48,965	38,840
Interest Income Recognized	124	282
Commercial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	224,546	240,638
Unpaid Principal Balance	280,850	301,320
Related Allowance	25,072	30,650
Average Recorded Investment	235,883	255,967
Interest Income Recognized	2,685	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	157,058	179,657
Unpaid Principal Balance	185,385	212,120
Related Allowance	25,072	30,650
Average Recorded Investment	163,965	187,923
Interest Income Recognized	2,475	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	67,488	60,981
Unpaid Principal Balance	95,465	89,200
Related Allowance	0	0
Average Recorded Investment	71,918	68,044
Interest Income Recognized	210	579
Home Equity [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	38,067	49,183
Unpaid Principal Balance	45,019	56,725
Related Allowance	14,556	24,580
Average Recorded Investment	39,698	52,498
Interest Income Recognized	712	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	37,770	47,113
Unpaid Principal Balance	44,686	54,456
Related Allowance	14,556	24,580
Average Recorded Investment	39,376	50,334
Interest Income Recognized	709	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	297	2,070
Unpaid Principal Balance	333	2,269
Related Allowance	0	0
Average Recorded Investment	322	2,164
Interest Income Recognized	3	36
Installment [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	2,103	2,491
Unpaid Principal Balance	2,482	2,847
Related Allowance	735	1,155
Average Recorded Investment	2,226	2,773
Interest Income Recognized	57	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	2,103	2,491
Unpaid Principal Balance	2,482	2,847
Related Allowance	735	1,155
Average Recorded Investment	2,226	2,773
Interest Income Recognized	57	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
Average Recorded Investment	0	0
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	71,843	81,643
Unpaid Principal Balance	84,752	94,205
Related Allowance	12,461	12,906
Average Recorded Investment	73,583	88,555
Interest Income Recognized	968	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	63,961	72,408
Unpaid Principal Balance	75,150	81,959
Related Allowance	12,461	12,906
Average Recorded Investment	65,713	76,989
Interest Income Recognized	856	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	7,882	9,235
Unpaid Principal Balance	9,602	12,246
Related Allowance	0	0
Average Recorded Investment	7,870	11,566
Interest Income Recognized	112	208
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	112,013	133,317
Unpaid Principal Balance	132,253	153,777
Related Allowance	27,752	38,641
Average Recorded Investment	115,507	143,826
Interest Income Recognized	1,737	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	103,834	122,012
Unpaid Principal Balance	122,318	139,262
Related Allowance	27,752	38,641
Average Recorded Investment	107,315	130,096
Interest Income Recognized	1,622	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	8,179	11,305
Unpaid Principal Balance	9,935	14,515
Related Allowance	0	0
Average Recorded Investment	8,192	13,730
Interest Income Recognized	$ 115	$ 244