Loans, Allowance for Loan Losses, and Credit Quality (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 345,529	$ 373,955
Unpaid Principal Balance	418,301	455,097
Related Allowance	57,640	69,291
Average Recorded Investment	356,246	399,793
Interest Income Recognized	2,139	11,726
Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	277,913	301,669
Unpaid Principal Balance	318,064	351,382
Related Allowance	57,640	69,291
Average Recorded Investment	283,065	318,019
Interest Income Recognized	2,025	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	67,616	72,286
Unpaid Principal Balance	100,237	103,715
Related Allowance	0	0
Average Recorded Investment	73,181	81,774
Interest Income Recognized	114	823
Commercial And Industrial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	62,493	67,322
Unpaid Principal Balance	78,608	81,860
Related Allowance	9,390	13,741
Average Recorded Investment	66,667	67,391
Interest Income Recognized	443	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	51,262	57,985
Unpaid Principal Balance	56,894	65,521
Related Allowance	9,390	13,741
Average Recorded Investment	52,001	56,508
Interest Income Recognized	385	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	11,231	9,337
Unpaid Principal Balance	21,714	16,339
Related Allowance	0	0
Average Recorded Investment	14,666	10,883
Interest Income Recognized	58	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	36,087	38,106
Unpaid Principal Balance	40,185	44,282
Related Allowance	3,558	3,811
Average Recorded Investment	36,584	40,956
Interest Income Recognized	229	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	23,953	24,600
Unpaid Principal Balance	26,397	27,700
Related Allowance	3,558	3,811
Average Recorded Investment	24,380	26,531
Interest Income Recognized	213	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	12,134	13,506
Unpaid Principal Balance	13,788	16,582
Related Allowance	0	0
Average Recorded Investment	12,204	14,425
Interest Income Recognized	16	68
Finance Leases Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	2,165	3,031
Unpaid Principal Balance	2,165	3,031
Related Allowance	4	0
Average Recorded Investment	2,512	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	105	7
Unpaid Principal Balance	105	7
Related Allowance	4	0
Average Recorded Investment	122	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	2,060	3,024
Unpaid Principal Balance	2,060	3,024
Related Allowance	0	0
Average Recorded Investment	2,390	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	100,745	108,459
Unpaid Principal Balance	120,958	129,173
Related Allowance	12,952	17,552
Average Recorded Investment	105,763	112,363
Interest Income Recognized	672	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	75,320	82,592
Unpaid Principal Balance	83,396	93,228
Related Allowance	12,952	17,552
Average Recorded Investment	76,503	83,159
Interest Income Recognized	598	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	25,425	25,867
Unpaid Principal Balance	37,562	35,945
Related Allowance	0	0
Average Recorded Investment	29,260	29,204
Interest Income Recognized	74	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	98,029	100,347
Unpaid Principal Balance	120,378	125,112
Related Allowance	9,991	9,687
Average Recorded Investment	100,145	106,132
Interest Income Recognized	580	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	79,905	80,766
Unpaid Principal Balance	90,732	96,581
Related Allowance	9,991	9,687
Average Recorded Investment	80,833	85,642
Interest Income Recognized	580	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	18,124	19,581
Unpaid Principal Balance	29,646	28,531
Related Allowance	0	0
Average Recorded Investment	19,312	20,490
Interest Income Recognized	0	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	27,706	31,832
Unpaid Principal Balance	37,277	47,035
Related Allowance	3,370	3,411
Average Recorded Investment	28,332	37,472
Interest Income Recognized	67	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	12,610	16,299
Unpaid Principal Balance	16,506	22,311
Related Allowance	3,370	3,411
Average Recorded Investment	12,917	19,122
Interest Income Recognized	67	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	15,096	15,533
Unpaid Principal Balance	20,771	24,724
Related Allowance	0	0
Average Recorded Investment	15,415	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	125,735	132,179
Unpaid Principal Balance	157,655	172,147
Related Allowance	13,361	13,098
Average Recorded Investment	128,477	143,604
Interest Income Recognized	647	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	92,515	97,065
Unpaid Principal Balance	107,238	118,892
Related Allowance	13,361	13,098
Average Recorded Investment	93,750	104,764
Interest Income Recognized	647	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	33,220	35,114
Unpaid Principal Balance	50,417	53,255
Related Allowance	0	0
Average Recorded Investment	34,727	38,840
Interest Income Recognized	0	282
Commercial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	226,480	240,638
Unpaid Principal Balance	278,613	301,320
Related Allowance	26,313	30,650
Average Recorded Investment	234,240	255,967
Interest Income Recognized	1,319	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	167,835	179,657
Unpaid Principal Balance	190,634	212,120
Related Allowance	26,313	30,650
Average Recorded Investment	170,253	187,923
Interest Income Recognized	1,245	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	58,645	60,981
Unpaid Principal Balance	87,979	89,200
Related Allowance	0	0
Average Recorded Investment	63,987	68,044
Interest Income Recognized	74	579
Home Equity [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	43,501	49,183
Unpaid Principal Balance	51,036	56,725
Related Allowance	17,869	24,580
Average Recorded Investment	44,731	52,498
Interest Income Recognized	354	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	42,898	47,113
Unpaid Principal Balance	50,329	54,456
Related Allowance	17,869	24,580
Average Recorded Investment	44,127	50,334
Interest Income Recognized	354	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	603	2,070
Unpaid Principal Balance	707	2,269
Related Allowance	0	0
Average Recorded Investment	604	2,164
Interest Income Recognized	0	36
Installment [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	2,426	2,491
Unpaid Principal Balance	2,833	2,847
Related Allowance	790	1,155
Average Recorded Investment	2,472	2,773
Interest Income Recognized	30	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	2,426	2,491
Unpaid Principal Balance	2,833	2,847
Related Allowance	790	1,155
Average Recorded Investment	2,472	2,773
Interest Income Recognized	30	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	73,122	81,643
Unpaid Principal Balance	85,819	94,205
Related Allowance	12,668	12,906
Average Recorded Investment	74,803	88,555
Interest Income Recognized	436	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	64,754	72,408
Unpaid Principal Balance	74,268	81,959
Related Allowance	12,668	12,906
Average Recorded Investment	66,213	76,989
Interest Income Recognized	396	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	8,368	9,235
Unpaid Principal Balance	11,551	12,246
Related Allowance	0	0
Average Recorded Investment	8,590	11,566
Interest Income Recognized	40	208
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	119,049	133,317
Unpaid Principal Balance	139,688	153,777
Related Allowance	31,327	38,641
Average Recorded Investment	122,006	143,826
Interest Income Recognized	820	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	110,078	122,012
Unpaid Principal Balance	127,430	139,262
Related Allowance	31,327	38,641
Average Recorded Investment	112,812	130,096
Interest Income Recognized	780	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	8,971	11,305
Unpaid Principal Balance	12,258	14,515
Related Allowance	0	0
Average Recorded Investment	9,194	13,730
Interest Income Recognized	$ 40	$ 244