v3.26.1
Bank Loans (Aging of the Recorded Investment in Past Due Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans $ 24,574,685 $ 22,066,763
Nonperforming loans with allowance 68,996 81,465
Nonperforming loans with no allowance 56,619 43,694
Total 125,615 125,159
30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 31,994 70,094
90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 85,201 104,676
Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 117,195 174,770
Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 24,457,490 21,891,993
Residential Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 9,619,618 9,254,939
Nonperforming loans with allowance 1,028 1,033
Nonperforming loans with no allowance 2,965 2,455
Total 3,993 3,488
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 8,834 16,269
Residential Real Estate [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 3,993 3,488
Residential Real Estate [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 12,827 19,757
Residential Real Estate [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 9,606,791 9,235,182
Fund Banking [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 5,767,990 4,096,649
Fund Banking [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans   1,774
Fund Banking [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans   1,774
Fund Banking [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 5,767,990 4,094,875
Commercial and Industrial [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 4,529,422 4,135,091
Nonperforming loans with allowance 67,290 80,429
Nonperforming loans with no allowance 7,746 2,307
Total 75,036 82,736
Commercial and Industrial [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 7,509 51,000
Commercial and Industrial [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 35,050 55,236
Commercial and Industrial [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 42,559 106,236
Commercial and Industrial [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 4,486,863 4,028,855
Securities-Based Loans [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 2,977,657 2,672,431
Securities-Based Loans [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 15,354 514
Securities-Based Loans [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 15,354 514
Securities-Based Loans [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 2,962,303 2,671,917
Commercial Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 412,809 423,474
Commercial Real Estate [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 412,809 423,474
Construction And Land [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 977,377 1,214,450
Nonperforming loans with no allowance 45,862 38,417
Total 45,862 38,417
Construction And Land [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 45,434 45,434
Construction And Land [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 45,434 45,434
Construction And Land [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 931,943 1,169,016
Home Equity Lines Of Credit [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 247,016 225,196
Nonperforming loans with allowance 661  
Nonperforming loans with no allowance   515
Total 661 515
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 203 499
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 662 515
Home Equity Lines Of Credit [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 865 1,014
Home Equity Lines Of Credit [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 246,151 224,182
Other [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 42,796 44,533
Nonperforming loans with allowance 17 3
Nonperforming loans with no allowance 46  
Total 63 3
Other [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 94 38
Other [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 62 3
Other [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans 156 41
Other [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total gross bank loans $ 42,640 $ 44,492