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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($)
Sep. 30, 2022
Dec. 31, 2021
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due $ 12,147,000 $ 23,432,000
Total 20,819,250,000 16,743,487,000
Non-Accrual 11,018,000 [1] 17,193,000 [2]
Restructured 151,000 [1] 154,000 [2]
Nonperforming loans with no allowance 0 [1] 1,000 [2]
Total 11,169,000 [1] 17,348,000 [2]
Loans past due 90 days and still accruing interest 0 0
Non-Accrual 11,018,000 [1] 17,193,000 [2]
30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 1,129,000 15,528,000
90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 11,018,000 7,904,000
Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 20,807,103,000 16,720,055,000
Residential Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 2,486,000 7,526,000
Total 7,048,762,000 5,482,026,000
Non-Accrual 1,790,000 [1] 1,332,000 [2]
Restructured 151,000 [1] 154,000 [2]
Nonperforming loans with no allowance [2]   0
Total 1,941,000 [1] 1,486,000 [2]
Non-Accrual 1,790,000 [1] 1,332,000 [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 696,000 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 1,790,000 1,332,000
Residential Real Estate [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 7,046,276,000 5,474,500,000
Commercial and Industrial [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 9,226,000 15,861,000
Total 9,394,557,000 7,345,753,000
Non-Accrual 9,226,000 [1] 15,861,000 [2]
Total 9,226,000 [1] 15,861,000 [2]
Non-Accrual 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 9,385,331,000 7,329,892,000
Securities-Based Loans [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 2,785,679,000 2,880,158,000
Securities-Based Loans [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 2,785,679,000 2,880,158,000
Commercial Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due   1,000
Total 872,010,000 409,847,000
Non-Accrual [2]   0
Nonperforming loans with no allowance [2]   1,000
Total [2]   1,000
Non-Accrual [2]   0
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 872,010,000 409,846,000
Home Equity Lines Of Credit [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 407,000 0
Total 106,037,000 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 407,000 0
Home Equity Lines Of Credit [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 105,630,000 82,508,000
Construction And Land [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 564,581,000 511,084,000
Construction And Land [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 564,581,000 511,084,000
Other [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 28,000 44,000
Total 47,624,000 32,111,000
Non-Accrual [1] 2,000  
Total [1] 2,000  
Non-Accrual [1] 2,000  
Other [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 26,000 44,000
Other [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 2,000  
Other [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due $ 47,596,000 $ 32,067,000
[1] There were no loans past due 90 days and still accruing interest at September 30, 2022
[2] There were no loans past due 90 days and still accruing interest at December 31, 2021.