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	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 230,263	$ 275,629
Unpaid Principal Balance	243,368	310,811
Related Allowance	31,713	50,431
YTD Average Recorded Investment	238,836	290,370
YTD Interest Income Recognized	5,421	9,384
Interest income recognized on accruing restructured loans	$ 3,000	$ 5,000
Fair Value Mark	82.00%	72.00%
Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 182,839	$ 232,166
Unpaid Principal Balance	194,180	253,186
Related Allowance	31,713	50,431
YTD Average Recorded Investment	186,058	242,219
YTD Interest Income Recognized	4,692	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	47,424	43,463
Unpaid Principal Balance	49,188	57,625
Related Allowance	0	0
YTD Average Recorded Investment	52,778	48,151
YTD Interest Income Recognized	729	587
Commercial And Industrial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	87,019	83,555
Unpaid Principal Balance	89,490	93,048
Related Allowance	6,899	16,467
YTD Average Recorded Investment	92,350	88,855
YTD Interest Income Recognized	1,518	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	58,855	76,433
Unpaid Principal Balance	60,303	80,414
Related Allowance	6,899	16,467
YTD Average Recorded Investment	59,502	80,004
YTD Interest Income Recognized	970	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	28,164	7,122
Unpaid Principal Balance	29,187	12,634
Related Allowance	0	0
YTD Average Recorded Investment	32,848	8,851
YTD Interest Income Recognized	548	82
Commercial Real Estate Owner Occupied [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,711	36,279
Unpaid Principal Balance	21,231	40,826
Related Allowance	571	3,221
YTD Average Recorded Investment	21,378	38,848
YTD Interest Income Recognized	363	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	9,537	19,839
Unpaid Principal Balance	9,660	21,807
Related Allowance	571	3,221
YTD Average Recorded Investment	9,784	20,878
YTD Interest Income Recognized	274	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	11,174	16,440
Unpaid Principal Balance	11,571	19,019
Related Allowance	0	0
YTD Average Recorded Investment	11,594	17,970
YTD Interest Income Recognized	89	219
Lease Financing [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,763	1,801
Unpaid Principal Balance	1,763	1,801
Related Allowance	0	574
YTD Average Recorded Investment	1,980	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	0	1,801
Unpaid Principal Balance	0	1,801
Related Allowance	0	574
YTD Average Recorded Investment	0	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	1,763	0
Unpaid Principal Balance	1,763	0
Related Allowance	0	0
YTD Average Recorded Investment	1,980	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	109,493	121,635
Unpaid Principal Balance	112,484	135,675
Related Allowance	7,470	20,262
YTD Average Recorded Investment	115,708	129,712
YTD Interest Income Recognized	1,881	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	68,392	98,073
Unpaid Principal Balance	69,963	104,022
Related Allowance	7,470	20,262
YTD Average Recorded Investment	69,286	102,891
YTD Interest Income Recognized	1,244	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	41,101	23,562
Unpaid Principal Balance	42,521	31,653
Related Allowance	0	0
YTD Average Recorded Investment	46,422	26,821
YTD Interest Income Recognized	637	301
Commercial Real Estate Investor [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	25,501	45,812
Unpaid Principal Balance	27,269	54,905
Related Allowance	1,349	3,587
YTD Average Recorded Investment	25,715	48,671
YTD Interest Income Recognized	868	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	23,916	36,841
Unpaid Principal Balance	25,594	40,869
Related Allowance	1,349	3,587
YTD Average Recorded Investment	24,119	38,657
YTD Interest Income Recognized	834	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	1,585	8,971
Unpaid Principal Balance	1,675	14,036
Related Allowance	0	0
YTD Average Recorded Investment	1,596	10,014
YTD Interest Income Recognized	34	133
Real Estate Construction [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,482	6,126
Unpaid Principal Balance	2,112	9,725
Related Allowance	474	1,095
YTD Average Recorded Investment	1,643	7,059
YTD Interest Income Recognized	42	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	1,482	3,043
Unpaid Principal Balance	2,112	5,910
Related Allowance	474	1,095
YTD Average Recorded Investment	1,643	3,818
YTD Interest Income Recognized	42	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	0	3,083
Unpaid Principal Balance	0	3,815
Related Allowance	0	0
YTD Average Recorded Investment	0	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	26,983	51,938
Unpaid Principal Balance	29,381	64,630
Related Allowance	1,823	4,682
YTD Average Recorded Investment	27,358	55,730
YTD Interest Income Recognized	910	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	25,398	39,884
Unpaid Principal Balance	27,706	46,779
Related Allowance	1,823	4,682
YTD Average Recorded Investment	25,762	42,475
YTD Interest Income Recognized	876	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	1,585	12,054
Unpaid Principal Balance	1,675	17,851
Related Allowance	0	0
YTD Average Recorded Investment	1,596	13,255
YTD Interest Income Recognized	34	133
Commercial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	136,476	173,573
Unpaid Principal Balance	141,865	200,305
Related Allowance	9,293	24,944
YTD Average Recorded Investment	143,066	185,442
YTD Interest Income Recognized	2,791	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	93,790	137,957
Unpaid Principal Balance	97,669	150,801
Related Allowance	9,293	24,944
YTD Average Recorded Investment	95,048	145,366
YTD Interest Income Recognized	2,120	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	42,686	35,616
Unpaid Principal Balance	44,196	49,504
Related Allowance	0	0
YTD Average Recorded Investment	48,018	40,076
YTD Interest Income Recognized	671	434
Home Equity [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,586	24,660
Unpaid Principal Balance	22,742	27,391
Related Allowance	9,655	11,382
YTD Average Recorded Investment	21,267	25,938
YTD Interest Income Recognized	817	1,275
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	20,526	23,874
Unpaid Principal Balance	22,682	26,585
Related Allowance	9,655	11,382
YTD Average Recorded Investment	21,207	25,087
YTD Interest Income Recognized	816	1,257
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	60	786
Unpaid Principal Balance	60	806
Related Allowance	0	0
YTD Average Recorded Investment	60	851
YTD Interest Income Recognized	1	18
Installment and Credit Cards [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,190	1,587
Unpaid Principal Balance	1,292	1,795
Related Allowance	210	308
YTD Average Recorded Investment	1,252	1,736
YTD Interest Income Recognized	25	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	1,190	1,587
Unpaid Principal Balance	1,292	1,795
Related Allowance	210	308
YTD Average Recorded Investment	1,252	1,736
YTD Interest Income Recognized	25	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	72,011	75,809
Unpaid Principal Balance	77,469	81,320
Related Allowance	12,555	13,797
YTD Average Recorded Investment	73,251	77,254
YTD Interest Income Recognized	1,788	2,442
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	67,333	68,748
Unpaid Principal Balance	72,537	74,005
Related Allowance	12,555	13,797
YTD Average Recorded Investment	68,551	70,030
YTD Interest Income Recognized	1,731	2,307
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	4,678	7,061
Unpaid Principal Balance	4,932	7,315
Related Allowance	0	0
YTD Average Recorded Investment	4,700	7,224
YTD Interest Income Recognized	57	135
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	93,787	102,056
Unpaid Principal Balance	101,503	110,506
Related Allowance	22,420	25,487
YTD Average Recorded Investment	95,770	104,928
YTD Interest Income Recognized	2,630	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	89,049	94,209
Unpaid Principal Balance	96,511	102,385
Related Allowance	22,420	25,487
YTD Average Recorded Investment	91,010	96,853
YTD Interest Income Recognized	2,572	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	4,738	7,847
Unpaid Principal Balance	4,992	8,121
Related Allowance	0	0
YTD Average Recorded Investment	4,760	8,075
YTD Interest Income Recognized	$ 58	$ 153