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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due $ 18,241,000 $ 24,937,000
Current Balance 11,152,572,000 9,727,679,000
Recorded Investment in Loans, Total 11,170,813,000 9,752,616,000
Non-accrual 12,395,000 [1] 14,373,000 [2]
Restructured 158,000 [1] 163,000 [2]
Nonperforming loans with no allowance [1] 1,249,000  
Total 13,802,000 [1] 14,536,000 [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 4,611,000 10,564,000
90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 13,630,000 14,373,000
Commercial And Industrial    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 12,251,000 12,940,000
Current Balance 4,283,838,000 3,426,013,000
Recorded Investment in Loans, Total 4,296,089,000 3,438,953,000
Non-accrual 12,251,000 [1] 12,940,000 [2]
Total 12,251,000 [1] 12,940,000 [2]
Commercial And Industrial | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 14,000  
Commercial And Industrial | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 12,237,000 12,940,000
Residential Mortgage    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 5,803,000 11,725,000
Current Balance 3,950,867,000 3,297,823,000
Recorded Investment in Loans, Total 3,956,670,000 3,309,548,000
Non-accrual [2]   1,249,000
Restructured 158,000 [1] 163,000 [2]
Nonperforming loans with no allowance [1] 1,249,000  
Total 1,407,000 [1] 1,412,000 [2]
Residential Mortgage | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 4,554,000 10,476,000
Residential Mortgage | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 1,249,000 1,249,000
Securities-Based Loans [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Current Balance 1,933,974,000 2,098,211,000
Recorded Investment in Loans, Total 1,933,974,000 2,098,211,000
Commercial Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 144,000  
Current Balance 366,341,000 428,549,000
Recorded Investment in Loans, Total 366,485,000 428,549,000
Non-accrual [1] 144,000  
Total [1] 144,000  
Commercial Real Estate [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 144,000  
Construction And Land [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Current Balance 501,681,000 398,839,000
Recorded Investment in Loans, Total 501,681,000 398,839,000
Home Equity Lines Of Credit [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 12,000 267,000
Current Balance 75,495,000 50,938,000
Recorded Investment in Loans, Total 75,507,000 51,205,000
Non-accrual [2]   184,000
Total [2]   184,000
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 12,000 83,000
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due   184,000
Other [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 31,000 5,000
Current Balance 40,376,000 27,306,000
Recorded Investment in Loans, Total 40,407,000 27,311,000
Other [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due $ 31,000 $ 5,000
[1] There were no loans past due 90 days and still accruing interest at December 31, 2020.
[2] There were no loans past due 90 days and still accruing interest at December 31, 2019.