Loans and Leases (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) contract	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) contract	Jun. 30, 2018 USD ($) contract	Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 15,154,000	$ 6,998,000	$ 18,670,000	$ 18,781,000
Post-Modification Outstanding Recorded Investment	16,155,000	5,939,000	18,771,000	$ 17,722,000
Nonaccrual loans and leases	81,265,000		81,265,000		$ 79,333,000
Receivable, 90 or more days past due	9,775,000		9,775,000		10,700,000
Receivable, 30-89 days past due	29,002,000		29,002,000		6,600,000
Financing receivable, nonaccrual status, current					62,000,000.0
Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	45,000,000.0		$ 45,000,000.0
Percentage of nonaccrual loans and leases			55.00%
Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases					79,333,000
Receivable, 90 or more days past due					10,723,000
Receivable, 30-89 days past due					17,085,000
Nonaccrual
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable, 90 or more days past due	9,800,000		$ 9,800,000
Receivable, 30-89 days past due	3,300,000		3,300,000
Financing receivable, nonaccrual status, current	68,200,000		68,200,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | contract				0
Nonaccrual loans and leases	60,536,000		60,536,000
Receivable, 90 or more days past due	2,552,000		2,552,000
Receivable, 30-89 days past due	15,158,000		15,158,000
Commercial | Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases					60,003,000
Receivable, 90 or more days past due					1,931,000
Receivable, 30-89 days past due					9,933,000
Commercial | Venture Capital Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-Modification Outstanding Recorded Investment	13,971,000	5,236,000	16,076,000	$ 5,236,000
Post-Modification Outstanding Recorded Investment	14,972,000	5,236,000	16,214,000	5,236,000
Nonaccrual loans and leases	22,501,000		22,501,000
Receivable, 90 or more days past due	0		0
Receivable, 30-89 days past due	447,000		447,000
Commercial | Venture Capital Loans | Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases					20,299,000
Receivable, 90 or more days past due					0
Receivable, 30-89 days past due					4,705,000
Commercial | Other Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-Modification Outstanding Recorded Investment	107,000	31,000	692,000	11,814,000
Post-Modification Outstanding Recorded Investment	107,000	31,000	692,000	11,814,000
Nonaccrual loans and leases	5,799,000		5,799,000
Receivable, 90 or more days past due	928,000		928,000
Receivable, 30-89 days past due	2,329,000		2,329,000
Commercial | Other Commercial | Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases					7,380,000
Receivable, 90 or more days past due					1,285,000
Receivable, 30-89 days past due					5,181,000
Commercial | Asset-based
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-Modification Outstanding Recorded Investment	620,000	0	620,000	0
Post-Modification Outstanding Recorded Investment	620,000	$ 0	620,000	$ 0
Nonaccrual loans and leases	32,236,000		32,236,000
Receivable, 90 or more days past due	1,624,000		1,624,000
Receivable, 30-89 days past due	$ 12,382,000		$ 12,382,000
Commercial | Asset-based | Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases					32,324,000
Receivable, 90 or more days past due					646,000
Receivable, 30-89 days past due					$ 47,000
Equipment Finance Commercial Financing Receivable | Venture Capital Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | contract	2		2
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 447,000		$ 447,000
Other Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | contract	1		3	1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 81,000		$ 140,000	$ 2,100,000