Loans and Leases (Details 5) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		$ 212,622		$ 235,551
Non Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Related Allowance		13,621		24,933
Impaired Financing Receivable, Recorded Investment		212,622	[1]	235,551
Impaired Financing Receivable, Unpaid Principal Balance		287,236	[1]	279,952
Impaired Financing Receivable, Average Recorded Investment	[3]	185,740	[2]	154,727		$ 121,757
Impaired Financing Receivable, Interest Income, Accrual Method		4,101		3,216		2,126
Non Purchased Credit Impaired Loans and Leases [Member] | Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Related Allowance		970		6,851
Impaired Financing Receivable, Recorded Investment		116,473	[1]	124,085
Impaired Financing Receivable, Unpaid Principal Balance		129,909	[1]	133,985
Impaired Financing Receivable, Average Recorded Investment	[3]	111,721	[2]	82,562		52,985
Impaired Financing Receivable, Interest Income, Accrual Method		3,643		2,803		1,549
Non Purchased Credit Impaired Loans and Leases [Member] | Mortgages [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		15,750	[1]	63,325
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		16,548	[1]	65,031
Impaired Financing Receivable, Related Allowance		628		6,266
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		93,827	[1]	44,557
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		105,923	[1]	51,402
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	15,538	[2]	26,870		17,833
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		881		898		1,130
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	89,554	[2]	41,917		28,366
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		2,648		1,506		345
Non Purchased Credit Impaired Loans and Leases [Member] | Mortgages [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		2,787	[1]	8,424
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		2,957	[1]	8,612
Impaired Financing Receivable, Related Allowance		342		585
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		4,109	[1]	7,779
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		4,481	[1]	8,940
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	2,787	[2]	6,521		2,143
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		55		255		33
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	3,842	[2]	7,254		4,643
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		59		144		41
Non Purchased Credit Impaired Loans and Leases [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Related Allowance		0		0
Impaired Financing Receivable, Recorded Investment		5,690	[1]	7,257
Impaired Financing Receivable, Unpaid Principal Balance		5,689	[1]	7,259
Impaired Financing Receivable, Average Recorded Investment	[3]	5,690	[2]	7,257		7,800
Impaired Financing Receivable, Interest Income, Accrual Method		306		238		255
Non Purchased Credit Impaired Loans and Leases [Member] | Real Estate Construction [Member] | Commercial Real Estate Construction Loan Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		5,690	[1]	6,680
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		5,689	[1]	6,680
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	5,690	[2]	6,680		7,053
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		306		224		240
Non Purchased Credit Impaired Loans and Leases [Member] | Real Estate Construction [Member] | Residential Real Estate Construction Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		0	[1]	213
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		0	[1]	213
Impaired Financing Receivable, Related Allowance		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		0	[1]	364
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		0	[1]	366
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	0	[2]	213		747
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		0		14		15
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	0	[2]	364		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0		0		0
Non Purchased Credit Impaired Loans and Leases [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Related Allowance		12,635		17,912
Impaired Financing Receivable, Recorded Investment		90,339	[1]	103,718
Impaired Financing Receivable, Unpaid Principal Balance		151,445	[1]	138,136
Impaired Financing Receivable, Average Recorded Investment	[3]	68,209	[2]	64,509		59,254
Impaired Financing Receivable, Interest Income, Accrual Method		144		166		307
Non Purchased Credit Impaired Loans and Leases [Member] | Commercial Portfolio Segment [Member] | Asset Based [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		1,311	[1]	4,395
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		1,337	[1]	4,861
Impaired Financing Receivable, Related Allowance		51		2,144
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		3,519	[1]	664
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		5,559	[1]	1,652
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	1,236	[2]	3,842		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		53		134		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	1,640	[2]	528		124
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		49		18		0
Non Purchased Credit Impaired Loans and Leases [Member] | Commercial Portfolio Segment [Member] | Equipment Finance Commercial Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		0	[1]	1,524
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		0	[1]	4,636
Impaired Financing Receivable, Related Allowance		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		30,939	[1]	31,324
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		50,433	[1]	53,319
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	0	[2]	508		8,475
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	30,653	[2]	30,767		30,363
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0		0		0
Non Purchased Credit Impaired Loans and Leases [Member] | Commercial Portfolio Segment [Member] | Venture Capital Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		16,565	[1]	5,821
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		17,203	[1]	5,880
Impaired Financing Receivable, Related Allowance		4,267		3,294
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		14,534	[1]	5,866
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		40,029	[1]	8,939
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		10,228	[2],[3]	1,227	[3]	12,590
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		0		0		32
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	2,860	[2]	2,446		2,752
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0		0		89
Non Purchased Credit Impaired Loans and Leases [Member] | Commercial Portfolio Segment [Member] | Cash Flow [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		19,093	[1]	51,272
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		28,614	[1]	52,910
Impaired Financing Receivable, Related Allowance		8,317		12,474
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		4,378	[1]	2,852
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		8,270	[1]	5,939
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	19,093	[2]	22,736		3,204
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		7		10		56
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	2,499	[2]	2,455		1,746
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		35		4		130
Non Purchased Credit Impaired Loans and Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		100	[1]	270
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		100	[1]	280
Impaired Financing Receivable, Related Allowance		16		170
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		20	[1]	221
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		93	[1]	292
Impaired Financing Receivable, Recorded Investment		120	[1]	491
Impaired Financing Receivable, Unpaid Principal Balance		193	[1]	572
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	[3]	100	[2]	233		355
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		8		0		15
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	[3]	20	[2]	166		1,363
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		0		9		0
Impaired Financing Receivable, Average Recorded Investment	[3]	120	[2]	399		1,718
Impaired Financing Receivable, Interest Income, Accrual Method		$ 8		$ 9		$ 15

[1] Excludes loans held for sale carried at lower of cost or fair value.

[2] Excludes loans held for sale carried at lower of cost or fair value.

[3] For the loans and leases (excluding PCI loans) reported as impaired at December 31, 2017, 2016 and 2015, amounts were calculated based on the period of time such loans and leases were impaired during the reported period.