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, 2018 USD ($) contracts	Dec. 31, 2017 USD ($) contracts	Dec. 31, 2016 USD ($) contracts
Financing Receivables, Modifications [Line Items]
Total Count | contracts	71	21	21
Total Balance | $	$ 29,243	$ 24,325	$ 12,897
Total count, payments in default | contracts	15	8	8
Total loans, payments in default | $	$ 7,708	$ 6,978	$ 7,841
Residential real estate and other
Financing Receivables, Modifications [Line Items]
Total Count | contracts	59	12	7
Total Balance | $	$ 9,762	$ 3,049	$ 1,082
Total count, payments in default | contracts	9	3	0
Total loans, payments in default | $	$ 1,957	$ 2,052	$ 0
Commercial, industrial and other | Commercial
Financing Receivables, Modifications [Line Items]
Total Count | contracts	4	5	3
Total Balance | $	$ 13,441	$ 3,775	$ 345
Total count, payments in default | contracts	2	4	1
Total loans, payments in default | $	$ 174	$ 3,681	$ 28
Franchise | Commercial
Financing Receivables, Modifications [Line Items]
Total Count | contracts	3	3	0
Total Balance | $	$ 5,157	$ 16,256	$ 0
Total count, payments in default | contracts	2	0	0
Total loans, payments in default | $	$ 5,122	$ 0	$ 0
Asset-based lending | Commercial
Financing Receivables, Modifications [Line Items]
Total Count | contracts	1	0	0
Total Balance | $	$ 130	$ 0	$ 0
Total count, payments in default | contracts	0	0	0
Total loans, payments in default | $	$ 0	$ 0	$ 0
Leases | Commercial
Financing Receivables, Modifications [Line Items]
Total Count | contracts	1	0	2
Total Balance | $	$ 239	$ 0	$ 2,949
Total count, payments in default | contracts	0	0	0
Total loans, payments in default | $	$ 0	$ 0	$ 0
Office | Commercial real estate
Financing Receivables, Modifications [Line Items]
Total Count | contracts	1	0	1
Total Balance | $	$ 59	$ 0	$ 450
Total count, payments in default | contracts	0	0	1
Total loans, payments in default | $	$ 0	$ 0	$ 450
Industrial | Commercial real estate
Financing Receivables, Modifications [Line Items]
Total Count | contracts	0	0	6
Total Balance | $	$ 0	$ 0	$ 7,921
Total count, payments in default | contracts	0	0	5
Total loans, payments in default | $	$ 0	$ 0	$ 7,347
Mixed use and other | Commercial real estate
Financing Receivables, Modifications [Line Items]
Total Count | contracts	2	1	2
Total Balance | $	$ 455	$ 1,245	$ 150
Total count, payments in default | contracts	2	1	1
Total loans, payments in default | $	$ 455	$ 1,245	$ 16