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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due $ 23,432,000 $ 18,241,000
Total 16,743,487,000 11,170,813,000
Non-accrual 17,193,000 12,395,000 [1]
Restructured 154,000 158,000 [1]
Nonperforming loans with no allowance 1,000 1,249,000 [1]
Total 17,348,000 13,802,000 [1]
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 15,528,000 4,611,000
90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 7,904,000 13,630,000
Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 16,720,055,000 11,152,572,000
Commercial and Industrial [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 15,861,000 12,251,000
Total 7,345,753,000 4,296,089,000
Non-accrual 15,861,000 12,251,000 [1]
Total 15,861,000 12,251,000 [1]
Commercial and Industrial [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 9,290,000 14,000
Commercial and Industrial [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 6,571,000 12,237,000
Commercial and Industrial [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 7,329,892,000 4,283,838,000
Residential Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 7,526,000 5,803,000
Total 5,482,026,000 3,956,670,000
Non-accrual 1,332,000  
Restructured 154,000 158,000 [1]
Nonperforming loans with no allowance [1]   1,249,000
Total 1,486,000 1,407,000 [1]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 6,194,000 4,554,000
Residential Real Estate [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 1,332,000 1,249,000
Residential Real Estate [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 5,474,500,000 3,950,867,000
Securities-Based Loans [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 2,880,158,000 1,933,974,000
Securities-Based Loans [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 2,880,158,000 1,933,974,000
Construction And Land [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 511,084,000 501,681,000
Construction And Land [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 511,084,000 501,681,000
Commercial Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 1,000 144,000
Total 409,847,000 366,485,000
Non-accrual [1]   144,000
Nonperforming loans with no allowance 1,000  
Total 1,000 144,000 [1]
Commercial Real Estate [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 1,000 144,000
Commercial Real Estate [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 409,846,000 366,341,000
Home Equity Lines Of Credit [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due   12,000
Total 82,508,000 75,507,000
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
Home Equity Lines Of Credit [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 82,508,000 75,495,000
Other [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 44,000 31,000
Total 32,111,000 40,407,000
Other [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 44,000 31,000
Other [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due $ 32,067,000 $ 40,376,000
[1] There were no loans past due 90 days and still accruing interest at December 31, 2020.