Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($)		Dec. 31, 2022		Dec. 31, 2021
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		$ 12,612,000		$ 23,432,000
Total		20,602,558,000		16,743,487,000
Non-accrual		10,102,000	[1]	17,193,000	[2]
Restructured		150,000	[1]	154,000	[2]
Nonperforming loans with no allowance	[2]			1,000
Total		10,252,000	[1]	17,348,000	[2]
Loans past due 90 days and still accruing interest		0		0
30 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		2,510,000		15,528,000
90 or More Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		10,102,000		7,904,000
Current Balance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		20,589,946,000		16,720,055,000
Commercial and Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		9,226,000		15,861,000
Total		4,897,176,000		4,208,950,000
Non-accrual		9,226,000	[1]	15,861,000	[2]
Total		9,226,000	[1]	15,861,000	[2]
Commercial and Industrial [Member] | 30 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due				9,290,000
Commercial and Industrial [Member] | 90 or More Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		9,226,000		6,571,000
Commercial and Industrial [Member] | Current Balance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		4,887,950,000		4,193,089,000
Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		3,133,000		7,526,000
Total		7,371,671,000		5,482,026,000
Non-accrual		870,000	[1]	1,332,000	[2]
Restructured		150,000	[1]	154,000	[2]
Nonperforming loans with no allowance	[2]			0
Total		1,020,000	[1]	1,486,000	[2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		2,445,000		6,194,000
Residential Real Estate [Member] | 90 or More Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		688,000		1,332,000
Residential Real Estate [Member] | Current Balance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		7,368,538,000		5,474,500,000
Securities-Based Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total		2,724,551,000		2,880,158,000
Securities-Based Loans [Member] | Current Balance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		2,724,551,000		2,880,158,000
Fund Banking [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total		4,182,641,000		3,136,803,000
Fund Banking [Member] | Current Balance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		4,182,641,000		3,136,803,000
Construction And Land [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total		593,191,000		511,084,000
Construction And Land [Member] | Current Balance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		593,191,000		511,084,000
Commercial Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due				1,000
Total		675,599,000		409,847,000
Non-accrual	[2]			0
Nonperforming loans with no allowance	[2]			1,000
Total	[2]			1,000
Commercial Real Estate [Member] | 90 or More Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due				1,000
Commercial Real Estate [Member] | Current Balance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		675,599,000		409,846,000
Home Equity Lines Of Credit [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		211,000		0
Total		107,136,000		82,508,000
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		29,000		0
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		182,000
Home Equity Lines Of Credit [Member] | Current Balance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		106,925,000
Other [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		42,000		44,000
Total		50,593,000		32,111,000
Non-accrual	[1]	6,000
Total	[1]	6,000
Other [Member] | 30 - 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		36,000		44,000
Other [Member] | 90 or More Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		6,000
Other [Member] | Current Balance [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		$ 50,551,000		$ 32,067,000

[1] There were no loans past due 90 days and still accruing interest at December 31, 2022.

[2] There were no loans past due 90 days and still accruing interest at December 31, 2021.