Loans and Leases - Nonaccrual Loans and Leases by Loan Portfolio Segment and Class (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	$ 672	$ 1,913
Nonaccrual	85,615	85,615	$ 92,353
Commercial
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	517	1,628
Nonaccrual	37,759	37,759	70,672
Consumer
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0	0
Nonaccrual	404	404	493
Consumer | Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0	0
Nonaccrual	404	404
Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	155	285
Nonaccrual	47,128	47,128	20,824
Real Estate Construction and Land
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0	0
Nonaccrual	324	324	364
Residential Real Estate | Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, No Allowance	845	845
Nonaccrual	2,008	2,008	2,478
Residential Real Estate | Real Estate Mortgage | No Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0	0
Residential Real Estate | Real Estate Mortgage | Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0	0
Nonaccrual	1,163	1,163
Commercial | Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, No Allowance	44,384	44,384
Nonaccrual	45,120	45,120	18,346
Commercial | Real Estate Mortgage | No Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	155	285
Commercial | Real Estate Mortgage | Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0	0
Nonaccrual	736	736
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, No Allowance	324	324
Nonaccrual	324	324	364
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land | No Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0	0
Asset-based | Commercial
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, No Allowance	569	569
Nonaccrual	2,817	2,817	30,162
Asset-based | Commercial | No Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0	0
Asset-based | Commercial | Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0	0
Nonaccrual	2,248	2,248
Venture Capital Loans | Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	2,001	2,001	12,916
Venture Capital Loans | Commercial | Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0	0
Nonaccrual	2,001	2,001
Other Commercial
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, No Allowance	31,706	31,706
Other Commercial | No Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	517	1,628
Other Commercial | Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	32,941	32,941	$ 27,594
Other Commercial | Commercial | Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0	0
Nonaccrual	$ 1,235	$ 1,235