Loans, Allowance for Credit Losses, and Credit Quality Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 250,581	$ 275,629
Unpaid Principal Balance	264,957	310,811
Related Allowance	34,825	50,431
YTD Average Recorded Investment	249,844	290,370
YTD Interest Income Recognized	3,476	9,384
Interest income recognized on accruing restructured loans	$ 2,000	$ 5,000
Fair Value Mark	81.00%	72.00%
Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 198,522	$ 232,166
Unpaid Principal Balance	209,918	253,186
Related Allowance	34,825	50,431
YTD Average Recorded Investment	197,176	242,219
YTD Interest Income Recognized	3,058	8,797
Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	52,059	43,463
Unpaid Principal Balance	55,039	57,625
Related Allowance	0	0
YTD Average Recorded Investment	52,668	48,151
YTD Interest Income Recognized	418	587
Commercial And Industrial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	96,801	83,555
Unpaid Principal Balance	99,061	93,048
Related Allowance	7,796	16,467
YTD Average Recorded Investment	94,130	88,855
YTD Interest Income Recognized	988	3,221
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	69,425	76,433
Unpaid Principal Balance	71,027	80,414
Related Allowance	7,796	16,467
YTD Average Recorded Investment	66,408	80,004
YTD Interest Income Recognized	651	3,139
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	27,376	7,122
Unpaid Principal Balance	28,034	12,634
Related Allowance	0	0
YTD Average Recorded Investment	27,722	8,851
YTD Interest Income Recognized	337	82
Commercial Real Estate Owner Occupied [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	24,254	36,279
Unpaid Principal Balance	25,857	40,826
Related Allowance	1,042	3,221
YTD Average Recorded Investment	24,659	38,848
YTD Interest Income Recognized	175	900
Commercial Real Estate Owner Occupied [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	11,096	19,839
Unpaid Principal Balance	11,338	21,807
Related Allowance	1,042	3,221
YTD Average Recorded Investment	11,324	20,878
YTD Interest Income Recognized	139	681
Commercial Real Estate Owner Occupied [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	13,158	16,440
Unpaid Principal Balance	14,519	19,019
Related Allowance	0	0
YTD Average Recorded Investment	13,335	17,970
YTD Interest Income Recognized	36	219
Lease Financing [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,656	1,801
Unpaid Principal Balance	1,656	1,801
Related Allowance	464	574
YTD Average Recorded Investment	1,710	2,009
YTD Interest Income Recognized	0	0
Lease Financing [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,656	1,801
Unpaid Principal Balance	1,656	1,801
Related Allowance	464	574
YTD Average Recorded Investment	1,710	2,009
YTD Interest Income Recognized	0	0
Lease Financing [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
Commercial And Business Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	122,711	121,635
Unpaid Principal Balance	126,574	135,675
Related Allowance	9,302	20,262
YTD Average Recorded Investment	120,499	129,712
YTD Interest Income Recognized	1,163	4,121
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	82,177	98,073
Unpaid Principal Balance	84,021	104,022
Related Allowance	9,302	20,262
YTD Average Recorded Investment	79,442	102,891
YTD Interest Income Recognized	790	3,820
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	40,534	23,562
Unpaid Principal Balance	42,553	31,653
Related Allowance	0	0
YTD Average Recorded Investment	41,057	26,821
YTD Interest Income Recognized	373	301
Commercial Real Estate Investor [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	28,099	45,812
Unpaid Principal Balance	30,172	54,905
Related Allowance	1,955	3,587
YTD Average Recorded Investment	28,268	48,671
YTD Interest Income Recognized	587	1,383
Commercial Real Estate Investor [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	25,868	36,841
Unpaid Principal Balance	27,546	40,869
Related Allowance	1,955	3,587
YTD Average Recorded Investment	25,995	38,657
YTD Interest Income Recognized	587	1,250
Commercial Real Estate Investor [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	2,231	8,971
Unpaid Principal Balance	2,626	14,036
Related Allowance	0	0
YTD Average Recorded Investment	2,273	10,014
YTD Interest Income Recognized	0	133
Real Estate Construction [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	3,620	6,126
Unpaid Principal Balance	4,626	9,725
Related Allowance	518	1,095
YTD Average Recorded Investment	3,885	7,059
YTD Interest Income Recognized	32	105
Real Estate Construction [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,695	3,043
Unpaid Principal Balance	2,389	5,910
Related Allowance	518	1,095
YTD Average Recorded Investment	1,931	3,818
YTD Interest Income Recognized	32	105
Real Estate Construction [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,925	3,083
Unpaid Principal Balance	2,237	3,815
Related Allowance	0	0
YTD Average Recorded Investment	1,954	3,241
YTD Interest Income Recognized	0	0
Commercial Real Estate Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	31,719	51,938
Unpaid Principal Balance	34,798	64,630
Related Allowance	2,473	4,682
YTD Average Recorded Investment	32,153	55,730
YTD Interest Income Recognized	619	1,488
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	27,563	39,884
Unpaid Principal Balance	29,935	46,779
Related Allowance	2,473	4,682
YTD Average Recorded Investment	27,926	42,475
YTD Interest Income Recognized	619	1,355
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	4,156	12,054
Unpaid Principal Balance	4,863	17,851
Related Allowance	0	0
YTD Average Recorded Investment	4,227	13,255
YTD Interest Income Recognized	0	133
Commercial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	154,430	173,573
Unpaid Principal Balance	161,372	200,305
Related Allowance	11,775	24,944
YTD Average Recorded Investment	152,652	185,442
YTD Interest Income Recognized	1,782	5,609
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	109,740	137,957
Unpaid Principal Balance	113,956	150,801
Related Allowance	11,775	24,944
YTD Average Recorded Investment	107,368	145,366
YTD Interest Income Recognized	1,409	5,175
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	44,690	35,616
Unpaid Principal Balance	47,416	49,504
Related Allowance	0	0
YTD Average Recorded Investment	45,284	40,076
YTD Interest Income Recognized	373	434
Home Equity [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	28,007	31,807
Unpaid Principal Balance	31,083	35,533
Related Allowance	11,401	13,015
YTD Average Recorded Investment	28,567	33,226
YTD Interest Income Recognized	648	1,528
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	27,797	31,021
Unpaid Principal Balance	30,873	34,727
Related Allowance	11,401	13,015
YTD Average Recorded Investment	28,356	32,375
YTD Interest Income Recognized	644	1,510
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	210	786
Unpaid Principal Balance	210	806
Related Allowance	0	0
YTD Average Recorded Investment	211	851
YTD Interest Income Recognized	4	18
Installment and Credit Cards [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,250	1,587
Unpaid Principal Balance	1,394	1,795
Related Allowance	234	308
YTD Average Recorded Investment	1,301	1,736
YTD Interest Income Recognized	15	58
Installment and Credit Cards [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,250	1,587
Unpaid Principal Balance	1,394	1,795
Related Allowance	234	308
YTD Average Recorded Investment	1,301	1,736
YTD Interest Income Recognized	15	58
Installment and Credit Cards [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 Mortgage [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	66,894	68,662
Unpaid Principal Balance	71,108	73,178
Related Allowance	11,415	12,164
YTD Average Recorded Investment	67,324	69,966
YTD Interest Income Recognized	1,031	2,189
Residential Mortgage [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	59,735	61,601
Unpaid Principal Balance	63,695	65,863
Related Allowance	11,415	12,164
YTD Average Recorded Investment	60,151	62,742
YTD Interest Income Recognized	990	2,054
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	7,159	7,061
Unpaid Principal Balance	7,413	7,315
Related Allowance	0	0
YTD Average Recorded Investment	7,173	7,224
YTD Interest Income Recognized	41	135
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	96,151	102,056
Unpaid Principal Balance	103,585	110,506
Related Allowance	23,050	25,487
YTD Average Recorded Investment	97,192	104,928
YTD Interest Income Recognized	1,694	3,775
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	88,782	94,209
Unpaid Principal Balance	95,962	102,385
Related Allowance	23,050	25,487
YTD Average Recorded Investment	89,808	96,853
YTD Interest Income Recognized	1,649	3,622
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	7,369	7,847
Unpaid Principal Balance	7,623	8,121
Related Allowance	0	0
YTD Average Recorded Investment	7,384	8,075
YTD Interest Income Recognized	$ 45	$ 153