Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Loans Restructured and Subsequently Defaulted Under the Restructured Terms) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) contracts	Dec. 31, 2018 USD ($) contracts	Dec. 31, 2017 USD ($) contracts
Financing Receivables, Modifications [Line Items]
Total, Count (contract) | contracts	176	71	21
Total, Balance | $	$ 53,565	$ 29,243	$ 24,325
Payments in Default, Count (contract) | contracts	27	15	8
Payments in Default, Balance | $	$ 28,566	$ 7,708	$ 6,978
Residential real estate and other
Financing Receivables, Modifications [Line Items]
Total, Count (contract) | contracts	145	59	12
Total, Balance | $	$ 20,206	$ 9,762	$ 3,049
Payments in Default, Count (contract) | contracts	12	9	3
Payments in Default, Balance | $	$ 5,126	$ 1,957	$ 2,052
Commercial, industrial and other | Commercial
Financing Receivables, Modifications [Line Items]
Total, Count (contract) | contracts	23	4	5
Total, Balance | $	$ 26,265	$ 13,441	$ 3,775
Payments in Default, Count (contract) | contracts	11	2	4
Payments in Default, Balance | $	$ 22,499	$ 174	$ 3,681
Franchise | Commercial
Financing Receivables, Modifications [Line Items]
Total, Count (contract) | contracts	0	3	3
Total, Balance | $	$ 0	$ 5,157	$ 16,256
Payments in Default, Count (contract) | contracts	0	2	0
Payments in Default, Balance | $	$ 0	$ 5,122	$ 0
Asset-based lending | Commercial
Financing Receivables, Modifications [Line Items]
Total, Count (contract) | contracts	1	1	0
Total, Balance | $	$ 76	$ 130	$ 0
Payments in Default, Count (contract) | contracts	1	0	0
Payments in Default, Balance | $	$ 76	$ 0	$ 0
Leases | Commercial
Financing Receivables, Modifications [Line Items]
Total, Count (contract) | contracts	0	1	0
Total, Balance | $	$ 0	$ 239	$ 0
Payments in Default, Count (contract) | contracts	0	0	0
Payments in Default, Balance | $	$ 0	$ 0	$ 0
Office | Commercial real estate
Financing Receivables, Modifications [Line Items]
Total, Count (contract) | contracts	2	1	0
Total, Balance | $	$ 5,382	$ 59	$ 0
Payments in Default, Count (contract) | contracts	1	0	0
Payments in Default, Balance | $	$ 312	$ 0	$ 0
Industrial | Commercial real estate
Financing Receivables, Modifications [Line Items]
Total, Count (contract) | contracts	0	0	0
Total, Balance | $	$ 0	$ 0	$ 0
Payments in Default, Count (contract) | contracts	0	0	0
Payments in Default, Balance | $	$ 0	$ 0	$ 0
Mixed use and other | Commercial real estate
Financing Receivables, Modifications [Line Items]
Total, Count (contract) | contracts	5	2	1
Total, Balance | $	$ 1,636	$ 455	$ 1,245
Payments in Default, Count (contract) | contracts	2	2	1
Payments in Default, Balance | $	$ 553	$ 455	$ 1,245