Allowance for Loan Losses (Schedule of Credit Losses Related to Originated Financing Receivables, Current and Non-Current) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	$ (14,700)	$ (6,800)
Provision for Loan, Lease, and Other Losses	(52,279)	(33,684)	(54,698)
Originated Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	95,696	96,484	98,942	107,699
Financing Receivable, Allowance for Credit Losses, Write-downs	44,923	40,173	65,905
Financing Receivable, Allowance for Credit Losses, Recovery	20,964	24,681	23,172
Provision for Loan, Lease, and Other Losses	23,171	13,034	33,976
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	5,950	6,146	5,004
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	89,746	90,338	93,938
Financing Receivable, Individually Evaluated for Impairment	93,448	87,764	96,371
Financing Receivable, Collectively Evaluated for Impairment	12,400,364	10,125,623	8,635,288
Financing Receivable, Net	12,493,812	10,213,387	8,731,659
Originated Loans | Commercial and Industrial Financing Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	37,375	42,981	36,209	32,363
Financing Receivable, Allowance for Credit Losses, Write-downs	9,617	5,840	22,639
Financing Receivable, Allowance for Credit Losses, Recovery	3,872	7,981	4,266
Provision for Loan, Lease, and Other Losses	139	4,631	22,219
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	72	3,235	577
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	37,303	39,746	35,632
Financing Receivable, Individually Evaluated for Impairment	11,759	8,053	6,187
Financing Receivable, Collectively Evaluated for Impairment	5,163,442	4,131,514	3,300,339
Financing Receivable, Net	5,175,201	4,139,567	3,306,526
Originated Loans | Commercial Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	10,492	12,265	20,126	31,857
Financing Receivable, Allowance for Credit Losses, Write-downs	3,512	1,281	5,312
Financing Receivable, Allowance for Credit Losses, Recovery	515	524	911
Provision for Loan, Lease, and Other Losses	1,224	(7,104)	(7,330)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		229	913
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	7,578	12,036	19,213
Financing Receivable, Individually Evaluated for Impairment	23,300	20,616	24,007
Financing Receivable, Collectively Evaluated for Impairment	2,093,818	2,149,171	2,200,409
Financing Receivable, Net	2,117,118	2,169,787	2,224,416
Originated Loans | Commercial Construction Financing Receivable Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	2,202	2,810	3,821	5,173
Financing Receivable, Allowance for Credit Losses, Write-downs	0	516	697
Financing Receivable, Allowance for Credit Losses, Recovery	39	507	449
Provision for Loan, Lease, and Other Losses	(647)	(1,002)	(1,104)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0	105
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2,202	2,810	3,716
Financing Receivable, Individually Evaluated for Impairment	0	906	3,405
Financing Receivable, Collectively Evaluated for Impairment	537,766	338,019	332,142
Financing Receivable, Net	537,766	338,925	335,547
Originated Loans | Finance Leases Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	674	1,081	639	341
Financing Receivable, Allowance for Credit Losses, Write-downs	0	1,237	144
Financing Receivable, Allowance for Credit Losses, Recovery	379	100	38
Provision for Loan, Lease, and Other Losses	(786)	1,579	404
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	674	1,081	639
Financing Receivable, Individually Evaluated for Impairment	0	0	0
Financing Receivable, Collectively Evaluated for Impairment	370,179	239,551	139,236
Financing Receivable, Net	370,179	239,551	139,236
Originated Loans | Installment Financing Receivable Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	12,918	11,935	11,154	17,981
Financing Receivable, Allowance for Credit Losses, Write-downs	20,328	16,683	18,029
Financing Receivable, Allowance for Credit Losses, Recovery	11,185	10,519	11,694
Provision for Loan, Lease, and Other Losses	10,126	6,945	(492)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1,014	1,526
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	11,740	10,921	9,628
Financing Receivable, Individually Evaluated for Impairment	24,905	27,285	30,870
Financing Receivable, Collectively Evaluated for Impairment	2,368,546	1,700,640	1,297,388
Financing Receivable, Net	2,393,451	1,727,925	1,328,258
Originated Loans | Home Equity Receivable Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	19,324	12,900	13,724	6,766
Financing Receivable, Allowance for Credit Losses, Write-downs	4,831	7,172	8,949
Financing Receivable, Allowance for Credit Losses, Recovery	2,940	2,979	3,441
Provision for Loan, Lease, and Other Losses	8,315	3,369	12,466
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		223	34
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	19,117	12,677	13,690
Financing Receivable, Individually Evaluated for Impairment	7,379	6,726	6,281
Financing Receivable, Collectively Evaluated for Impairment	1,102,957	913,340	799,797
Financing Receivable, Net	1,110,336	920,066	806,078
Originated Loans | Credit Card Receivables Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	7,966	7,740	7,384	7,369
Financing Receivable, Allowance for Credit Losses, Write-downs	4,604	5,541	6,171
Financing Receivable, Allowance for Credit Losses, Recovery	1,716	1,841	2,138
Provision for Loan, Lease, and Other Losses	3,114	4,056	4,048
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		312	127
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	7,670	7,428	7,257
Financing Receivable, Individually Evaluated for Impairment	854	1,112	1,612
Financing Receivable, Collectively Evaluated for Impairment	163,624	147,201	144,775
Financing Receivable, Net	164,478	148,313	146,387
Originated Loans | Residential Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	4,745	4,772	5,885	5,849
Financing Receivable, Allowance for Credit Losses, Write-downs	2,031	1,903	3,964
Financing Receivable, Allowance for Credit Losses, Recovery	318	230	235
Provision for Loan, Lease, and Other Losses	1,686	560	3,765
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,283	1,133	1,722
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,462	3,639	4,163
Financing Receivable, Individually Evaluated for Impairment	25,251	23,066	24,009
Financing Receivable, Collectively Evaluated for Impairment	600,032	506,187	421,202
Financing Receivable, Net	$ 625,283	$ 529,253	$ 445,211