Bank Loans (Activity In The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 111,653	$ 99,344
Provision	25,586	16,525
Charge-offs	(9,100)	(4,586)
Recoveries	153	370
Ending Balance	128,292	111,653
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	54,143	44,661
Provision	21,881	13,662
Charge-offs	(9,100)	(4,550)
Recoveries	153	370
Ending Balance	67,077	54,143
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	12,897	3,934
Provision	8,489	8,963
Ending Balance	21,386	12,897
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	20,441	28,560
Provision	(6,586)	(8,119)
Ending Balance	13,855	20,441
Construction And Land [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	8,568	8,536
Provision	3,249	32
Ending Balance	11,817	8,568
Fund Banking [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	11,711	8,868
Provision	(1,538)	2,843
Ending Balance	10,173	11,711
Securities-Based Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	3,157	4,006
Provision	(122)	(813)
Charge-offs		(36)
Ending Balance	3,035	3,157
Home Equity Lines Of Credit [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	364	511
Provision	7	(147)
Recoveries		0
Ending Balance	371	364
Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	372	268
Provision	206	104
Charge-offs		0
Recoveries		0
Ending Balance	$ 578	$ 372