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Commitments, Guarantees, Concentrations and Contingencies (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
repurchase_obligation
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Lessee, Lease, Description [Line Items]          
Occupancy expense $ 11,291,000 $ 8,045,000 $ 21,259,000 $ 16,165,000  
Number of repurchase obligations | repurchase_obligation     3    
Estimated repurchase obligations 18,300,000   $ 18,300,000   $ 18,400,000
Loans sold, subject to terms and conditions of repurchase obligations 16,200,000,000   16,200,000,000   15,700,000,000
Letters of credit outstanding with financial institutions 4,100,000   4,100,000   4,700,000
Collateral amount 700,000   700,000   1,300,000
Secured loans 1,275,529,000   1,275,529,000   1,516,736,000
Minimum net worth noncompliance, fines and penalties accrued 0   0   0
Funded Loan          
Lessee, Lease, Description [Line Items]          
Secured loans 8,200,000   8,200,000    
Unfunded Loan Commitment          
Lessee, Lease, Description [Line Items]          
Commitment to fund a line of credit 21,800,000   21,800,000    
Asset Pledged as Collateral          
Lessee, Lease, Description [Line Items]          
Letters of credit outstanding with financial institutions $ 46,700,000   $ 46,700,000   $ 46,700,000
Minimum          
Lessee, Lease, Description [Line Items]          
Operating lease, renewal term 1 year   1 year    
Maximum          
Lessee, Lease, Description [Line Items]          
Operating lease, renewal term 10 years   10 years    
Maximum | Unfunded Loan Commitment          
Lessee, Lease, Description [Line Items]          
Commitment to fund a line of credit $ 30,000,000.0   $ 30,000,000.0