Bank Loans (Activity In The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 107,482	$ 99,196	$ 99,344	$ 112,029
Provision	1,550	(4,903)	9,722	(12,534)
Charge-offs	4,008	0	4,044	5,202
Recoveries	0	0	2	0
Ending Balance	105,024	94,293	105,024	94,293
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	67,352	46,943	53,529	67,222
Provision	903	(256)	14,724	(15,333)
Charge-offs	(4,008)	0	(4,008)	(5,202)
Recoveries	0	0	2	0
Ending Balance	64,247	46,687	64,247	46,687
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	22,615	21,267	28,560	16,300
Provision	(5,150)	2,637	(11,095)	7,604
Ending Balance	17,465	23,904	17,465	23,904
Construction And Land [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	5,854	15,953	8,536	17,275
Provision	1,675	1,620	(1,007)	(2,942)
Ending Balance	7,529	14,333	7,529	14,333
Securities-Based Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	3,976	2,519	4,006	2,015
Provision	(658)	808	(652)	1,312
Charge-offs			(36)
Ending Balance	3,318	3,327	3,318	3,327
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	6,483	11,903	3,934	8,580
Provision	5,480	(6,582)	8,029	(3,259)
Ending Balance	11,963	5,321	11,963	5,321
Home Equity Lines Of Credit [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	922	426	511	374
Provision	(724)	48	(313)	100
Recoveries		0		0
Ending Balance	198	474	198	474
Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	280	185	268	263
Provision	24	62	36	(16)
Charge-offs		0		0
Recoveries		0		0
Ending Balance	$ 304	$ 247	$ 304	$ 247