Loans and Leases (Details 6)		12 Months Ended
		Dec. 31, 2018 USD ($) contract Contract		Dec. 31, 2017 USD ($) contract Contract		Dec. 31, 2016 USD ($) contract Contract
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		60	[1]	50	[2]	54	[3]
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 101,878,000	[1]	$ 69,737,000	[2]	$ 100,161,000	[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 90,373,000	[1]	$ 59,237,000	[2]	$ 89,443,000	[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract		0		1		4	[3]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	[4]	$ 0	[2]	$ 1,000	[5]	$ 6,502,000	[5]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down		$ 0		$ 68,000
Mortgages [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		10		5		12
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 17,181,000		$ 2,527,000		$ 13,833,000
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 2,604,000		$ 2,463,000		$ 6,099,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		0		0		0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	[4]	$ 0		$ 0		$ 0
Mortgages [Member] | Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		10		8		10
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 3,262,000		$ 1,328,000		$ 7,091,000
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 2,203,000		$ 489,000		$ 6,439,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		0		0		2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	[4]	$ 0		$ 0		$ 5,000,000
Real Estate Construction [Member] | Residential Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract				0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	[4]			$ 0
Real Estate Construction [Member] | Commercial Real Estate Construction Loan Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Contract						1
Financing Receivable, Modifications, Pre-Modification Recorded Investment						$ 1,245,000
Financing Receivable, Modifications, Post-Modification Recorded Investment						$ 1,245,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts						0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	[4]					$ 0
Commercial Portfolio Segment [Member] | Cash Flow [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts				19		19
Financing Receivable, Modifications, Pre-Modification Recorded Investment				$ 31,471,000		$ 32,946,000
Financing Receivable, Modifications, Post-Modification Recorded Investment				$ 22,236,000		$ 32,946,000
Commercial Portfolio Segment [Member] | Asset Based [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		4		5		7
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 28,947,000	[1]	$ 4,219,000		$ 44,196,000
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 33,947,000	[1]	$ 4,219,000		$ 42,572,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract		0		0		2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	[4]	$ 0		$ 0		$ 1,502,000
Commercial Portfolio Segment [Member] | Venture Capital Loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		14		11
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 37,416,000		$ 29,733,000
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 36,919,000		$ 29,733,000
Commercial Portfolio Segment [Member] | Other Commercial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		19
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 14,399,000
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 14,027,000
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		3		1		5
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 673,000		$ 97,000		$ 850,000
Financing Receivable, Modifications, Post-Modification Recorded Investment		673,000		$ 97,000		$ 142,000
Equipment Finance Commercial Financing Receivable [Member] | Cash Flow [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	[4]	$ 0
Equipment Finance Commercial Financing Receivable [Member] | Venture Capital Loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract		0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	[4]	$ 0
Commercial Portfolio Segment [Member] | Commercial Portfolio Segment [Member] | Cash Flow [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract				1		0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	[4]			$ 1,000		$ 0
Commercial Real Estate Construction Loan Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract				1
Financing Receivable, Modifications, Pre-Modification Recorded Investment				$ 362,000
Financing Receivable, Modifications, Post-Modification Recorded Investment				$ 0
Consumer Portfolio Segment [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract		0		0		0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	[4]	$ 0		$ 0		$ 0
Finance Receivable, Modification of Modified Loan [Member] | Commercial Portfolio Segment [Member] | Asset Based [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	[1]	27,314,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	[1]	$ 32,314,000

[1] Represents the balance at December 31, 2018, and there were no

[2] Represents the balance at December 31, 2017, and is net of charge-offs of

[3] Represents the balance at December 31, 2016, and there were no

[4] The population of defaulted TDRs for the period indicated includes only those loans restructured during the preceding 12-month period. For example, for the year ended December 31, 2018, the population of defaulted TDRs includes only those loans restructured after December 31, 2017. The table excludes defaulted TDRs in those classes for which the recorded investment was zero at the end of the period.

[5] Represents the balance at December 31, 2016, and there were no charge-offs.