Allowance for Loan Losses (Schedule of Credit Losses Related to Originated Financing Receivables, Current) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	$ (600)	$ (2,200)
Provision/ (recapture) for loan losses	7,809	8,248
Originated Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	105,135	95,696
Financing Receivable, Allowance for Credit Losses, Write-downs	(13,014)	(8,567)
Recoveries	5,384	4,380
Provision/ (recapture) for loan losses	5,410	6,036
Balance at end of the period	102,915	97,545
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			$ 9,290	$ 14,349	$ 13,297
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			93,625	90,786	84,248
Financing Receivable, Allowance for Credit Losses	105,135	95,696	102,915	105,135	97,545
Financing Receivable, Individually Evaluated for Impairment			142,655	129,038	110,943
Financing Receivable, Collectively Evaluated for Impairment			14,246,858	13,989,467	12,745,094
Financing Receivable, Net			14,389,513	14,118,505	12,856,037
Originated Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	44,760	37,375
Financing Receivable, Allowance for Credit Losses, Write-downs	(3,209)	(510)
Recoveries	532	341
Provision/ (recapture) for loan losses	2,406	2,632
Balance at end of the period	44,489	39,838
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			6,194	11,837	10,042
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			38,295	32,923	29,796
Financing Receivable, Allowance for Credit Losses	44,760	37,375	44,489	44,760	39,838
Financing Receivable, Individually Evaluated for Impairment			46,996	43,818	35,792
Financing Receivable, Collectively Evaluated for Impairment			5,790,319	5,749,590	5,282,105
Financing Receivable, Net			5,837,315	5,793,408	5,317,897
Originated Loans | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	9,631	10,492
Financing Receivable, Allowance for Credit Losses, Write-downs	(109)	(215)
Recoveries	24	0
Provision/ (recapture) for loan losses	(2,302)	(1,464)
Balance at end of the period	7,244	8,813
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			567	128	317
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			6,677	9,503	8,496
Financing Receivable, Allowance for Credit Losses	9,631	10,492	7,244	9,631	8,813
Financing Receivable, Individually Evaluated for Impairment			24,013	16,614	15,000
Financing Receivable, Collectively Evaluated for Impairment			2,055,649	2,060,730	2,118,017
Financing Receivable, Net			2,079,662	2,077,344	2,133,017
Originated Loans | Construction Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	1,594	2,202
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0
Recoveries	2	1
Provision/ (recapture) for loan losses	(59)	(451)
Balance at end of the period	1,537	1,752
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			1,537	1,594	1,752
Financing Receivable, Allowance for Credit Losses	1,594	2,202	1,537	1,594	1,752
Financing Receivable, Individually Evaluated for Impairment			0	0	0
Financing Receivable, Collectively Evaluated for Impairment			670,825	645,337	580,978
Financing Receivable, Net			670,825	645,337	580,978
Originated Loans | Finance Leases Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	1,313	674
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0
Recoveries	19	4
Provision/ (recapture) for loan losses	167	(49)
Balance at end of the period	1,499	629
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			1,499	1,313	629
Financing Receivable, Allowance for Credit Losses	1,313	674	1,499	1,313	629
Financing Receivable, Individually Evaluated for Impairment			0	0	0
Financing Receivable, Collectively Evaluated for Impairment			512,929	491,741	388,873
Financing Receivable, Net			512,929	491,741	388,873
Originated Loans | Installment
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	14,183	12,918
Financing Receivable, Allowance for Credit Losses, Write-downs	(6,769)	(5,055)
Recoveries	3,806	3,020
Provision/ (recapture) for loan losses	3,444	2,475
Balance at end of the period	14,664	13,358
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			1,081	1,009	1,005
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			13,583	13,174	12,353
Financing Receivable, Allowance for Credit Losses	14,183	12,918	14,664	14,183	13,358
Financing Receivable, Individually Evaluated for Impairment			40,134	36,904	26,882
Financing Receivable, Collectively Evaluated for Impairment			3,114,778	2,953,445	2,473,406
Financing Receivable, Net			3,154,912	2,990,349	2,500,288
Originated Loans | Home Equity Line of Credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	20,094	19,324
Financing Receivable, Allowance for Credit Losses, Write-downs	(1,027)	(911)
Recoveries	624	613
Provision/ (recapture) for loan losses	(163)	407
Balance at end of the period	19,528	19,433
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			185	188	254
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			19,343	19,906	19,179
Financing Receivable, Allowance for Credit Losses	20,094	19,324	19,528	20,094	19,433
Financing Receivable, Individually Evaluated for Impairment			7,720	7,080	7,632
Financing Receivable, Collectively Evaluated for Impairment			1,246,989	1,241,358	1,126,606
Financing Receivable, Net			1,254,709	1,248,438	1,134,238
Originated Loans | Credit Card Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	8,831	7,966
Financing Receivable, Allowance for Credit Losses, Write-downs	(1,450)	(1,452)
Recoveries	357	366
Provision/ (recapture) for loan losses	853	921
Balance at end of the period	8,591	7,801
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			225	243	263
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			8,366	8,588	7,538
Financing Receivable, Allowance for Credit Losses	8,831	7,966	8,591	8,831	7,801
Financing Receivable, Individually Evaluated for Impairment			687	717	815
Financing Receivable, Collectively Evaluated for Impairment			178,336	182,126	159,951
Financing Receivable, Net			179,023	182,843	160,766
Originated Loans | Residential Mortgages
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	4,729	4,745
Financing Receivable, Allowance for Credit Losses, Write-downs	(450)	(424)
Recoveries	20	35
Provision/ (recapture) for loan losses	1,064	1,565
Balance at end of the period	5,363	5,921
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			1,038	944	1,416
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment			4,325	3,785	4,505
Financing Receivable, Allowance for Credit Losses	$ 4,729	$ 4,745	5,363	4,729	5,921
Financing Receivable, Individually Evaluated for Impairment			23,105	23,905	24,822
Financing Receivable, Collectively Evaluated for Impairment			677,033	665,140	615,158
Financing Receivable, Net			$ 700,138	$ 689,045	$ 639,980