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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due $ 25,233,000 $ 22,043,000
Total 19,091,860,000 19,441,467,000
Non-accrual 42,660,000 [1] 42,221,000 [2]
Restructured 144,000 [1] 145,000 [2]
Nonperforming loans with no allowance 16,625,000 [1] 3,090,000 [2]
Total 59,429,000 [1] 45,456,000 [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 20,635,000 15,927,000
90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 4,598,000 6,116,000
Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 19,066,627,000 19,419,424,000
Residential Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 24,829,000 19,257,000
Total 8,096,975,000 8,047,647,000
Non-accrual 2,009,000 [1] 2,945,000 [2]
Restructured 144,000 [1] 145,000 [2]
Nonperforming loans with no allowance 2,438,000 [1] 1,000,000 [2]
Total 4,591,000 [1] 4,090,000 [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 20,382,000 15,312,000
Residential Real Estate [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 4,447,000 3,945,000
Residential Real Estate [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 8,072,146,000 8,028,390,000
Commercial And Industrial [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due   2,022,000
Total 3,541,770,000 3,566,987,000
Non-accrual [1] 2,329,000  
Nonperforming loans with no allowance 14,187,000 [1] 2,022,000 [2]
Total 16,516,000 [1] 2,022,000 [2]
Commercial And Industrial [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due   0
Commercial And Industrial [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due   2,022,000
Commercial And Industrial [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 3,541,770,000 3,564,965,000
Fund Banking [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 3,129,642,000 3,633,126,000
Fund Banking [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 3,129,642,000 3,633,126,000
Securities-Based Loans [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due   3,000
Total 2,302,250,000 2,306,455,000
Nonperforming loans with no allowance [2]   3,000
Total [2]   3,000
Securities-Based Loans [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due   3,000
Securities-Based Loans [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 2,302,250,000 2,306,452,000
Construction And Land [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 1,167,300,000 1,034,370,000
Construction And Land [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 1,167,300,000 1,034,370,000
Commercial Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due   0
Total 655,355,000 660,631,000
Non-accrual 38,171,000 [1] 39,195,000 [2]
Total 38,171,000 [1] 39,195,000 [2]
Commercial Real Estate [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due   0
Commercial Real Estate [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 655,355,000 660,631,000
Home Equity Lines Of Credit [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 344,000 657,000
Total 150,452,000 136,270,000
Non-accrual 102,000 [1] 22,000 [2]
Nonperforming loans with no allowance [2]   65,000
Total 102,000 [1] 87,000 [2]
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 242,000 570,000
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 102,000 87,000
Home Equity Lines Of Credit [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 150,108,000 135,613,000
Other [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 60,000 104,000
Total 48,116,000 55,981,000
Non-accrual 49,000 [1] 59,000 [2]
Total 49,000 [1] 59,000 [2]
Other [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 11,000 45,000
Other [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 49,000 59,000
Other [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due $ 48,056,000 $ 55,877,000
[1] There were no loans past due 90 days and still accruing interest at March 31, 2024
[2] There were no loans past due 90 days and still accruing interest at December 31, 2023.