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	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 294,902	$ 309,413
Unpaid Principal Balance	341,113	361,694
Related Allowance	49,809	51,875
YTD Average Recorded Investment	300,215	328,022
YTD Interest Income Recognized	1,941	10,137
Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	245,220	250,263
Unpaid Principal Balance	276,491	283,066
Related Allowance	49,809	51,875
YTD Average Recorded Investment	248,121	264,784
YTD Interest Income Recognized	1,849	9,186
Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	49,682	59,150
Unpaid Principal Balance	64,622	78,628
Related Allowance	0	0
YTD Average Recorded Investment	52,094	63,238
YTD Interest Income Recognized	92	951
Commercial And Industrial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	66,264	70,236
Unpaid Principal Balance	79,190	84,999
Related Allowance	10,645	11,917
YTD Average Recorded Investment	69,859	75,291
YTD Interest Income Recognized	356	2,047
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	56,650	57,857
Unpaid Principal Balance	62,196	65,443
Related Allowance	10,645	11,917
YTD Average Recorded Investment	58,237	61,000
YTD Interest Income Recognized	347	1,741
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	9,614	12,379
Unpaid Principal Balance	16,994	19,556
Related Allowance	0	0
YTD Average Recorded Investment	11,622	14,291
YTD Interest Income Recognized	9	306
Commercial Real Estate Owner Occupied Portfolio [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	38,314	42,673
Unpaid Principal Balance	43,891	47,903
Related Allowance	3,186	2,955
YTD Average Recorded Investment	38,704	45,151
YTD Interest Income Recognized	169	1,310
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	21,746	22,651
Unpaid Principal Balance	24,807	25,072
Related Allowance	3,186	2,955
YTD Average Recorded Investment	21,918	24,549
YTD Interest Income Recognized	164	995
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	16,568	20,022
Unpaid Principal Balance	19,084	22,831
Related Allowance	0	0
YTD Average Recorded Investment	16,786	20,602
YTD Interest Income Recognized	5	315
Finance Leases Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	172	69
Unpaid Principal Balance	10	69
Related Allowance	69	29
YTD Average Recorded Investment	10	76
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	172	69
Unpaid Principal Balance	10	69
Related Allowance	69	29
YTD Average Recorded Investment	10	76
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	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	104,750	112,978
Unpaid Principal Balance	123,091	132,971
Related Allowance	13,900	14,901
YTD Average Recorded Investment	108,573	120,518
YTD Interest Income Recognized	525	3,357
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	78,568	80,577
Unpaid Principal Balance	87,013	90,584
Related Allowance	13,900	14,901
YTD Average Recorded Investment	80,165	85,625
YTD Interest Income Recognized	511	2,736
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	26,182	32,401
Unpaid Principal Balance	36,078	42,387
Related Allowance	0	0
YTD Average Recorded Investment	28,408	34,893
YTD Interest Income Recognized	14	621
Commercial Real Estate Investor Portfolio Segment [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	79,631	82,542
Unpaid Principal Balance	94,056	93,677
Related Allowance	8,124	7,895
YTD Average Recorded Investment	80,072	88,130
YTD Interest Income Recognized	574	2,865
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	66,402	64,647
Unpaid Principal Balance	76,331	68,228
Related Allowance	8,124	7,895
YTD Average Recorded Investment	66,761	68,776
YTD Interest Income Recognized	529	2,735
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	13,229	17,895
Unpaid Principal Balance	17,725	25,449
Related Allowance	0	0
YTD Average Recorded Investment	13,311	19,354
YTD Interest Income Recognized	45	130
Commercial Real Estate Construction Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	9,621	10,260
Unpaid Principal Balance	13,919	14,388
Related Allowance	2,150	2,416
YTD Average Recorded Investment	9,935	11,372
YTD Interest Income Recognized	46	249
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	7,972	8,815
Unpaid Principal Balance	11,841	12,535
Related Allowance	2,150	2,416
YTD Average Recorded Investment	8,228	9,796
YTD Interest Income Recognized	43	236
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	1,649	1,445
Unpaid Principal Balance	2,078	1,853
Related Allowance	0	0
YTD Average Recorded Investment	1,707	1,576
YTD Interest Income Recognized	3	13
Commercial Real Estate Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	89,252	92,802
Unpaid Principal Balance	107,975	108,065
Related Allowance	10,274	10,311
YTD Average Recorded Investment	90,007	99,502
YTD Interest Income Recognized	620	3,114
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	74,374	73,462
Unpaid Principal Balance	88,172	80,763
Related Allowance	10,274	10,311
YTD Average Recorded Investment	74,989	78,572
YTD Interest Income Recognized	572	2,971
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	14,878	19,340
Unpaid Principal Balance	19,803	27,302
Related Allowance	0	0
YTD Average Recorded Investment	15,018	20,930
YTD Interest Income Recognized	48	143
Commercial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	194,002	205,780
Unpaid Principal Balance	231,066	241,036
Related Allowance	24,174	25,212
YTD Average Recorded Investment	198,580	220,020
YTD Interest Income Recognized	1,145	6,471
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	152,942	154,039
Unpaid Principal Balance	175,185	171,347
Related Allowance	24,174	25,212
YTD Average Recorded Investment	155,154	164,197
YTD Interest Income Recognized	1,083	5,707
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	41,060	51,741
Unpaid Principal Balance	55,881	69,689
Related Allowance	0	0
YTD Average Recorded Investment	43,426	55,823
YTD Interest Income Recognized	62	764
Home Equity [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	32,057	34,800
Unpaid Principal Balance	36,736	40,436
Related Allowance	13,099	13,989
YTD Average Recorded Investment	32,329	36,717
YTD Interest Income Recognized	339	1,520
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	31,742	34,707
Unpaid Principal Balance	36,421	40,344
Related Allowance	13,099	13,989
YTD Average Recorded Investment	32,014	36,623
YTD Interest Income Recognized	336	1,518
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	315	93
Unpaid Principal Balance	315	92
Related Allowance	0	0
YTD Average Recorded Investment	315	94
YTD Interest Income Recognized	3	2
Installment [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,140	1,360
Unpaid Principal Balance	1,392	1,676
Related Allowance	448	487
YTD Average Recorded Investment	1,167	1,753
YTD Interest Income Recognized	14	100
Installment [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,140	1,360
Unpaid Principal Balance	1,392	1,676
Related Allowance	448	487
YTD Average Recorded Investment	1,167	1,753
YTD Interest Income Recognized	14	100
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	67,703	67,473
Unpaid Principal Balance	71,919	78,546
Related Allowance	12,088	12,187
YTD Average Recorded Investment	68,139	69,532
YTD Interest Income Recognized	443	2,046
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	59,396	60,157
Unpaid Principal Balance	63,493	69,699
Related Allowance	12,088	12,187
YTD Average Recorded Investment	59,786	62,211
YTD Interest Income Recognized	416	1,861
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	8,307	7,316
Unpaid Principal Balance	8,426	8,847
Related Allowance	0	0
YTD Average Recorded Investment	8,353	7,321
YTD Interest Income Recognized	27	185
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	100,900	103,633
Unpaid Principal Balance	110,047	120,658
Related Allowance	25,635	26,663
YTD Average Recorded Investment	101,635	108,002
YTD Interest Income Recognized	796	3,666
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	92,278	96,224
Unpaid Principal Balance	101,306	111,719
Related Allowance	25,635	26,663
YTD Average Recorded Investment	92,967	100,587
YTD Interest Income Recognized	766	3,479
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	8,622	7,409
Unpaid Principal Balance	8,741	8,939
Related Allowance	0	0
YTD Average Recorded Investment	8,668	7,415
YTD Interest Income Recognized	$ 30	$ 187