Bank Loans (Activity In The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 99,344	$ 112,029
Provision	16,525	(7,454)
Charge-offs	(4,586)	(5,232)
Recoveries	370	1
Ending Balance	111,653	99,344
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	44,661	62,557
Provision	13,662	(12,665)
Charge-offs	(4,550)	(5,232)
Recoveries	370	1
Ending Balance	54,143	44,661
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	28,560	16,300
Provision	(8,119)	12,260
Ending Balance	20,441	28,560
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	3,934	8,580
Provision	8,963	(4,646)
Ending Balance	12,897	3,934
Fund Banking [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	8,868	4,665
Provision	2,843	4,203
Ending Balance	11,711	8,868
Construction And Land [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	8,536	17,275
Provision	32	(8,739)
Ending Balance	8,568	8,536
Securities-Based Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	4,006	2,015
Provision	(813)	1,991
Charge-offs	36
Ending Balance	3,157	4,006
Home Equity Lines Of Credit [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	511	374
Provision	(147)	137
Recoveries		0
Ending Balance	364	511
Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	268	263
Provision	104	5
Charge-offs		0
Recoveries		0
Ending Balance	$ 372	$ 268