Allowance for Loan Losses Schedule of Credit Losses Related to Originated Financing Receivables, Current (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for Loan and Lease Losses	$ 14,275	$ 9,192	$ 31,489	$ 38,982
Financing Receivable, Allowance for Credit Losses, Write-downs	900		4,700
Provision for Loan, Lease, and Other Losses	14,275	9,192	31,489	38,982
Covered impaired loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for Loan and Lease Losses	3,729	(81)	2,836	6,420
Originated Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	104,055	90,883	104,055	90,883	$ 101,682	$ 95,696	$ 91,950	$ 96,484
Financing Receivable, Allowance for Credit Losses, Write-downs	(13,398)	(11,410)	(33,263)	(35,718)
Financing Receivable, Allowance for Credit Losses, Recovery	5,369	5,481	14,375	15,608
Provision for Loan, Lease, and Other Losses	(10,402)	(4,862)	(27,247)	(14,509)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	10,882	6,052	10,882	6,052		5,950
Impaired Financing Receivable, Related Allowance	10,882	6,052	10,882	6,052		5,950
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	93,173	84,831	93,173	84,831		89,746
Financing Receivable, Individually Evaluated for Impairment	132,234	91,971	132,234	91,971		93,448
Financing Receivable, Collectively Evaluated for Impairment	13,516,091	11,979,788	13,516,091	11,979,788		12,400,364
Financing Receivable, Net	13,648,325	12,071,759	13,648,325	12,071,759		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		322		322		296
Financing Receivable, Net	170,392	160,113	170,392	160,113		164,478
Originated Loans | Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	42,994	37,125	42,994	37,125	42,876	37,375	43,256	42,981
Financing Receivable, Allowance for Credit Losses, Write-downs		(3,569)	(8,298)	(9,203)
Financing Receivable, Allowance for Credit Losses, Recovery		1,262	921	2,681
Provision for Loan, Lease, and Other Losses		3,824	(12,996)	(666)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	7,790	1,399	7,790	1,399		72
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	35,204	35,726	35,204	35,726		37,303
Financing Receivable, Individually Evaluated for Impairment	52,147	11,155	52,147	11,155		11,759
Financing Receivable, Collectively Evaluated for Impairment	5,469,808	5,028,165	5,469,808	5,028,165		5,163,442
Financing Receivable, Net	5,521,955	5,039,320	5,521,955	5,039,320		5,175,201
Originated Loans | Commercial Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	9,992	8,446	9,992	8,446	8,500	10,492	8,730	12,265
Financing Receivable, Allowance for Credit Losses, Write-downs	(3)	(570)	(625)	(3,345)
Financing Receivable, Allowance for Credit Losses, Recovery	516	43	517	77
Provision for Loan, Lease, and Other Losses	(979)	(243)	392	551
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	703	1,620	703	1,620		2,914
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	9,289	6,826	9,289	6,826		7,578
Financing Receivable, Individually Evaluated for Impairment	13,355	22,597	13,355	22,597		23,300
Financing Receivable, Collectively Evaluated for Impairment	2,076,178	2,097,137	2,076,178	2,097,137		2,093,818
Financing Receivable, Net	2,089,533	2,119,734	2,089,533	2,119,734		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	1,617	1,498	1,617	1,498	1,540	2,202	1,323	2,810
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Recovery	133	5	172	35
Provision for Loan, Lease, and Other Losses	56	(170)	757	1,347
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	1,617	1,498	1,617	1,498		2,202
Financing Receivable, Individually Evaluated for Impairment	0	0	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	619,569	467,112	619,569	467,112		537,766
Financing Receivable, Net	619,569	467,112	619,569	467,112		537,766
Originated Loans | Finance Leases Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	662	736	662	736	619	674	1,028	1,081
Financing Receivable, Allowance for Credit Losses, Write-downs	(1,268)	0	(1,268)	0
Financing Receivable, Allowance for Credit Losses, Recovery	730	2	737	374
Provision for Loan, Lease, and Other Losses	(581)	294	(519)	719
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	662	736	662	736		674
Financing Receivable, Individually Evaluated for Impairment	0	0	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	461,642	339,936	461,642	339,936		370,179
Financing Receivable, Net	461,642	339,936	461,642	339,936		370,179
Originated Loans | Installment Financing Receivable Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	15,470	13,660	15,470	13,660	14,910	12,918	12,243	11,935
Financing Receivable, Allowance for Credit Losses, Write-downs	(5,065)	(5,041)	(15,210)	(14,739)
Financing Receivable, Allowance for Credit Losses, Recovery	2,889	2,944	8,753	8,735
Provision for Loan, Lease, and Other Losses	(2,736)	(3,514)	(9,009)	(7,729)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1,086		1,086		1,178
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	14,458	12,574	14,458	12,574		11,740
Financing Receivable, Individually Evaluated for Impairment	34,306	23,575	34,306	23,575		24,905
Financing Receivable, Collectively Evaluated for Impairment	2,865,253	2,253,958	2,865,253	2,253,958		2,368,546
Financing Receivable, Net	2,899,559	2,277,533	2,899,559	2,277,533		2,393,451
Originated Loans | Home Equity Receivable Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	20,350	17,898	20,350	17,898	20,039	19,324	13,903	12,900
Financing Receivable, Allowance for Credit Losses, Write-downs	(940)	(1,361)	(2,822)	(3,403)
Financing Receivable, Allowance for Credit Losses, Recovery	564	708	2,016	2,227
Provision for Loan, Lease, and Other Losses	(687)	(4,648)	(1,832)	(6,174)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		190		190		207
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	20,147	17,708	20,147	17,708		19,117
Financing Receivable, Individually Evaluated for Impairment	7,394	7,624	7,394	7,624		7,379
Financing Receivable, Collectively Evaluated for Impairment	1,204,690	1,054,389	1,204,690	1,054,389		1,102,957
Financing Receivable, Net	1,212,084	1,062,013	1,212,084	1,062,013		1,110,336
Originated Loans | Credit Card Receivables Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	8,167	7,512	8,167	7,512	7,818	7,966	7,328	7,740
Financing Receivable, Allowance for Credit Losses, Write-downs	(1,173)	(778)	(3,834)	(3,544)
Financing Receivable, Allowance for Credit Losses, Recovery	331	403	1,055	1,260
Provision for Loan, Lease, and Other Losses	(1,191)	(559)	(2,980)	(2,056)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		322		322		296
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	7,932	7,190	7,932	7,190		7,670
Financing Receivable, Individually Evaluated for Impairment	716	912	716	912		854
Financing Receivable, Collectively Evaluated for Impairment	169,676	159,201	169,676	159,201		163,624
Financing Receivable, Net	170,392	160,113	170,392	160,113		164,478
Originated Loans | Residential Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	4,803	4,008	4,803	4,008	$ 5,380	4,745	$ 4,139	$ 4,772
Financing Receivable, Allowance for Credit Losses, Write-downs	(409)	(91)	(1,206)	(1,484)
Financing Receivable, Allowance for Credit Losses, Recovery	80	114	204	219
Provision for Loan, Lease, and Other Losses	248	154	(1,060)	(501)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1,435		1,435		1,283
Impaired Financing Receivable, Related Allowance	939		939
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,864	2,573	3,864	2,573		3,462
Financing Receivable, Individually Evaluated for Impairment	24,316	26,108	24,316	26,108		25,251
Financing Receivable, Collectively Evaluated for Impairment	649,275	579,890	649,275	579,890		600,032
Financing Receivable, Net	673,591	605,998	673,591	605,998		625,283
Originated Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	(4,540)
Financing Receivable, Allowance for Credit Losses, Recovery	126
Provision for Loan, Lease, and Other Losses	(4,532)
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1,399		1,399		72
Financing Receivable, Net	$ 5,521,955	$ 5,039,320	$ 5,521,955	$ 5,039,320		$ 5,175,201