Bank Loans (Activity in the Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 128,292	$ 111,653
Provision	27,679	25,586
Charge-offs	(19,297)	(9,100)
Recoveries	2,634	153
Ending Balance	139,308	128,292
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	67,077	54,143
Provision	35,369	21,881
Charge-offs	(10,688)	(9,100)
Recoveries	940	153
Ending Balance	92,698	67,077
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	21,386	12,897
Provision	(13,329)	8,489
Charge-offs	(1,690)
Recoveries	1,690
Ending Balance	8,057	21,386
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	13,855	20,441
Provision	(2,794)	(6,586)
Ending Balance	11,061	13,855
Construction And Land [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	11,817	8,568
Provision	7,809	3,249
Charge-offs	(6,760)
Ending Balance	12,866	11,817
Fund Banking [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	10,173	11,711
Provision	619	(1,538)
Ending Balance	10,792	10,173
Securities-Based Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	3,035	3,157
Provision	(118)	(122)
Ending Balance	2,917	3,035
Home Equity Lines Of Credit [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	371	364
Provision	(54)	7
Ending Balance	317	371
Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	578	372
Provision	177	206
Charge-offs	(159)
Recoveries	4
Ending Balance	$ 600	$ 578