Allowance for Loan Losses Schedule of Credit Losses Related to Originated Financing Receivables, Current (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for Loan and Lease Losses		$ 8,966	$ 15,253	$ 17,214	$ 29,790
Financing Receivable, Allowance for Credit Losses, Write-downs		1,600		3,800
Provision for Loan, Lease, and Other Losses		8,966	15,253	17,214	29,790
Covered impaired loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for Loan and Lease Losses		(891)	3,446	(893)	6,501
Originated Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses		101,682	91,950	101,682	91,950	$ 97,545	$ 95,696	$ 92,116	$ 96,484
Financing Receivable, Allowance for Credit Losses, Write-downs		(11,298)	(11,148)	(19,865)	(24,308)
Financing Receivable, Allowance for Credit Losses, Recovery		4,626	4,989	9,006	10,127
Provision for Loan, Lease, and Other Losses		(10,809)	(5,993)	(16,845)	(9,647)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		11,626	7,802	11,626	7,802		5,950
Impaired Financing Receivable, Related Allowance	[1]	11,626	7,802	11,626	7,802		5,950
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		90,056	84,148	90,056	84,148		89,746
Financing Receivable, Individually Evaluated for Impairment		124,035	94,567	124,035	94,567		93,448
Financing Receivable, Collectively Evaluated for Impairment		13,231,877	11,372,626	13,231,877	11,372,626		12,400,364
Financing Receivable, Net		13,355,912	11,467,193	13,355,912	11,467,193		12,493,812
Originated Loans | Credit Card Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	[1]		361		361		296
Financing Receivable, Net		168,576	151,967	168,576	151,967		164,478
Originated Loans | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses		42,876	43,256	42,876	43,256	39,838	37,375	40,175	42,981
Financing Receivable, Allowance for Credit Losses, Write-downs			(361)	(3,757)	(5,435)
Financing Receivable, Allowance for Credit Losses, Recovery			372	794	1,369
Provision for Loan, Lease, and Other Losses			(3,070)	(8,464)	(4,341)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		9,117	5,092	9,117	5,092		72
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		33,759	38,164	33,759	38,164		37,303
Financing Receivable, Individually Evaluated for Impairment		45,969	10,404	45,969	10,404		11,759
Financing Receivable, Collectively Evaluated for Impairment		5,425,394	4,847,211	5,425,394	4,847,211		5,163,442
Financing Receivable, Net		5,471,363	4,857,615	5,471,363	4,857,615		5,175,201
Originated Loans | Commercial Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses		8,500	8,730	8,500	8,730	8,813	10,492	13,385	12,265
Financing Receivable, Allowance for Credit Losses, Write-downs		(408)	(2,696)	(623)	(2,775)
Financing Receivable, Allowance for Credit Losses, Recovery		1	30	1	34
Provision for Loan, Lease, and Other Losses		(94)	1,989	1,370	794
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		151	112	151	112		2,914
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		8,349	8,618	8,349	8,618		7,578
Financing Receivable, Individually Evaluated for Impairment		12,072	25,484	12,072	25,484		23,300
Financing Receivable, Collectively Evaluated for Impairment		2,126,300	2,072,534	2,126,300	2,072,534		2,093,818
Financing Receivable, Net		2,138,372	2,098,018	2,138,372	2,098,018		2,117,118
Originated Loans | Commercial Construction Financing Receivable Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses		1,540	1,323	1,540	1,323	1,752	2,202	1,470	2,810
Financing Receivable, Allowance for Credit Losses, Write-downs		0	0	0	0
Financing Receivable, Allowance for Credit Losses, Recovery		39	2	40	30
Provision for Loan, Lease, and Other Losses		251	149	702	1,517
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0	9	0	9		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		1,540	1,314	1,540	1,314		2,202
Financing Receivable, Individually Evaluated for Impairment		0	53	0	53		0
Financing Receivable, Collectively Evaluated for Impairment		586,895	409,813	586,895	409,813		537,766
Financing Receivable, Net		586,895	409,866	586,895	409,866		537,766
Originated Loans | Finance Leases Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses		619	1,028	619	1,028	629	674	1,027	1,081
Financing Receivable, Allowance for Credit Losses, Write-downs		0	0	0	0
Financing Receivable, Allowance for Credit Losses, Recovery		3	372	7	372
Provision for Loan, Lease, and Other Losses		13	371	62	425
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0	0	0	0		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		619	1,028	619	1,028		674
Financing Receivable, Individually Evaluated for Impairment		1,162	0	1,162	0		0
Financing Receivable, Collectively Evaluated for Impairment		435,540	319,795	435,540	319,795		370,179
Financing Receivable, Net		436,702	319,795	436,702	319,795		370,179
Originated Loans | Installment Financing Receivable Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses		14,910	12,243	14,910	12,243	13,358	12,918	11,604	11,935
Financing Receivable, Allowance for Credit Losses, Write-downs		(5,090)	(4,076)	(10,145)	(8,660)
Financing Receivable, Allowance for Credit Losses, Recovery		2,844	2,741	5,864	5,490
Provision for Loan, Lease, and Other Losses		(3,798)	(1,974)	(6,273)	(3,478)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			1,008		1,008		1,178
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		13,909	11,235	13,909	11,235		11,740
Financing Receivable, Individually Evaluated for Impairment		31,927	24,394	31,927	24,394		24,905
Financing Receivable, Collectively Evaluated for Impairment		2,688,132	2,027,193	2,688,132	2,027,193		2,368,546
Financing Receivable, Net		2,720,059	2,051,587	2,720,059	2,051,587		2,393,451
Originated Loans | Home Equity Receivable Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses		20,039	13,903	20,039	13,903	19,433	19,324	13,160	12,900
Financing Receivable, Allowance for Credit Losses, Write-downs		(971)	(1,870)	(1,882)	(3,279)
Financing Receivable, Allowance for Credit Losses, Recovery		839	966	1,452	1,870
Provision for Loan, Lease, and Other Losses		(738)	(1,647)	(1,145)	(2,412)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			201		201		207
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		19,822	13,702	19,822	13,702		19,117
Financing Receivable, Individually Evaluated for Impairment		7,421	6,956	7,421	6,956		7,379
Financing Receivable, Collectively Evaluated for Impairment		1,173,381	991,223	1,173,381	991,223		1,102,957
Financing Receivable, Net		1,180,802	998,179	1,180,802	998,179		1,110,336
Originated Loans | Credit Card Receivables Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses		7,818	7,328	7,818	7,328	7,801	7,966	6,851	7,740
Financing Receivable, Allowance for Credit Losses, Write-downs		(1,209)	(1,311)	(2,661)	(2,766)
Financing Receivable, Allowance for Credit Losses, Recovery		358	439	724	857
Provision for Loan, Lease, and Other Losses		(868)	(1,349)	(1,789)	(1,497)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			361		361		296
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		7,568	6,967	7,568	6,967		7,670
Financing Receivable, Individually Evaluated for Impairment		787	979	787	979		854
Financing Receivable, Collectively Evaluated for Impairment		167,789	150,988	167,789	150,988		163,624
Financing Receivable, Net		168,576	151,967	168,576	151,967		164,478
Originated Loans | Residential Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses		5,380	4,139	5,380	4,139	$ 5,921	4,745	$ 4,444	$ 4,772
Financing Receivable, Allowance for Credit Losses, Write-downs		(373)	(834)	(797)	(1,393)
Financing Receivable, Allowance for Credit Losses, Recovery		89	67	124	105
Provision for Loan, Lease, and Other Losses		257	(462)	(1,308)	(655)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	[1]		1,019		1,019		1,283
Impaired Financing Receivable, Related Allowance	[1]	890		890
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		4,490	3,120	4,490	3,120		3,462
Financing Receivable, Individually Evaluated for Impairment		24,697	26,297	24,697	26,297		25,251
Financing Receivable, Collectively Evaluated for Impairment		628,446	553,869	628,446	553,869		600,032
Financing Receivable, Net		653,143	580,166	653,143	580,166		625,283
Originated Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs		(3,247)
Financing Receivable, Allowance for Credit Losses, Recovery		453
Provision for Loan, Lease, and Other Losses		(5,832)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	[1]		5,092		5,092		72
Financing Receivable, Net		$ 5,471,363	$ 4,857,615	$ 5,471,363	$ 4,857,615		$ 5,175,201

[1] Note 1: These tables exclude loans fully charged off.Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.