v3.26.1
Bank Loans (Schedule of Balance and Associated Percentage of Each Major Loan Category in Bank Loan Portfolio) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total risk category of loan portfolio $ 24,574,685   $ 22,066,763      
Loans in process/(unapplied loan payments), net (19,831)   (10,779)      
Unamortized loan fees, net (2,656)   1,518      
Allowance for credit losses on loans (120,685) $ (115,178) (132,245) $ (135,734) $ (140,061) $ (139,308)
Loans held for investment, net $ 24,431,513   $ 21,925,257      
Gross bank loans, Percent 100.00%   100.00%      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total risk category of loan portfolio $ 9,619,618   $ 9,254,939      
Allowance for credit losses on loans $ (12,389) (10,988) $ (11,264) (13,767) (11,172) (11,061)
Gross bank loans, Percent 39.10%   41.90%      
Fund Banking [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total risk category of loan portfolio $ 5,767,990   $ 4,096,649      
Allowance for credit losses on loans $ (8,809) (7,475) $ (8,193) (10,948) (10,246) (10,792)
Gross bank loans, Percent 23.50%   18.60%      
Commercial and Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total risk category of loan portfolio $ 4,529,422   $ 4,135,091      
Allowance for credit losses on loans $ (79,053) (76,781) $ (92,612) (84,981) (92,294) (92,698)
Gross bank loans, Percent 18.40%   18.70%      
Securities-Based Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total risk category of loan portfolio $ 2,977,657   $ 2,672,431      
Allowance for credit losses on loans $ (3,509) (3,300) $ (3,254) (3,128) (2,928) (2,917)
Gross bank loans, Percent 12.10%   12.10%      
Construction And Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total risk category of loan portfolio $ 977,377   $ 1,214,450      
Allowance for credit losses on loans $ (10,687) (10,295) $ (10,567) (12,854) (13,251) (12,866)
Gross bank loans, Percent 4.00%   5.50%      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total risk category of loan portfolio $ 412,809   $ 423,474      
Allowance for credit losses on loans $ (4,919) (5,651) $ (5,650) (8,795) (9,366) (8,057)
Gross bank loans, Percent 1.70%   1.90%      
Home Equity Lines Of Credit [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total risk category of loan portfolio $ 247,016   $ 225,196      
Allowance for credit losses on loans $ (740) (120) $ (134) (660) (170) (317)
Gross bank loans, Percent 1.00%   1.00%      
Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total risk category of loan portfolio $ 42,796   $ 44,533      
Allowance for credit losses on loans $ (579) $ (568) $ (571) $ (601) $ (634) $ (600)
Gross bank loans, Percent 0.20%   0.30%