Bank Loans (Activity In The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 112,029	$ 95,579
CECL Adoption		(11,736)
Provision	(7,454)	28,264
Charge-offs	5,232	(193)
Recoveries	1	115
Ending Balance	99,344	112,029
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	67,222	69,949
CECL Adoption		(19,940)
Provision	(8,462)	17,341
Charge-offs	(5,232)	(153)
Recoveries	1	25
Ending Balance	53,529	67,222
Construction And Land [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	17,275	4,613
CECL Adoption		2,674
Provision	(8,739)	9,988
Ending Balance	8,536	17,275
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	16,300	14,253
CECL Adoption		3,499
Provision	12,260	(1,452)
Ending Balance	28,560	16,300
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	8,580	3,564
CECL Adoption		791
Provision	(4,646)	4,225
Ending Balance	3,934	8,580
Securities-Based Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	2,015	2,361
CECL Adoption		1,346
Provision	1,991	(1,692)
Ending Balance	4,006	2,015
Home Equity Lines Of Credit [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	374	442
CECL Adoption		39
Provision	137	(195)
Recoveries		88
Ending Balance	511	374
Other [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	263	397
CECL Adoption		(145)
Provision	5	49
Charge-offs		(40)
Recoveries		2
Ending Balance	$ 268	$ 263