Loans and Leases (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) contract	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) contract	Sep. 30, 2018 USD ($) contract	Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 594,000	$ 57,736,000	$ 18,805,000	$ 76,517,000
Post-Modification Outstanding Recorded Investment	594,000	60,187,000	18,906,000	$ 77,909,000
Nonaccrual loans and leases	99,113,000		99,113,000		$ 79,333,000
Receivable, 90 or more days past due	10,917,000		10,917,000		10,700,000
Receivable, 30-89 days past due	17,625,000		17,625,000		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	53,400,000		$ 53,400,000
Percentage of nonaccrual loans and leases			54.00%
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	10,900,000		$ 10,900,000
Receivable, 30-89 days past due	6,300,000		6,300,000
Financing receivable, nonaccrual status, current	81,900,000		81,900,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | contract				0
Nonaccrual loans and leases	75,700,000		75,700,000
Receivable, 90 or more days past due	2,903,000		2,903,000
Receivable, 30-89 days past due	6,790,000		6,790,000
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	0	23,501,000	16,076,000	$ 28,737,000
Post-Modification Outstanding Recorded Investment	0	23,501,000	16,214,000	28,737,000
Nonaccrual loans and leases	20,131,000		20,131,000
Receivable, 90 or more days past due	0		0
Receivable, 30-89 days past due	0		0
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	99,000	1,487,000	792,000	13,301,000
Post-Modification Outstanding Recorded Investment	99,000	1,115,000	792,000	12,929,000
Nonaccrual loans and leases	22,554,000		22,554,000
Receivable, 90 or more days past due	2,241,000		2,241,000
Receivable, 30-89 days past due	6,742,000		6,742,000
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	0	28,947,000	620,000	28,947,000
Post-Modification Outstanding Recorded Investment	0	$ 33,947,000	620,000	$ 33,947,000
Nonaccrual loans and leases	33,015,000		33,015,000
Receivable, 90 or more days past due	662,000		662,000
Receivable, 30-89 days past due	$ 48,000		$ 48,000
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
Financing Receivable, Troubled Debt Restructuring, Subsequent Default			$ 441,000
Other Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | contract	3		3
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 133,000		$ 133,000
Other Residential | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | contract	1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 254,000