Variable Interest Entities - Additional Information (Detail) - Credit Risk Transfer Agreements [Member] |
6 Months Ended |
|---|---|
Jun. 30, 2025 | |
| Minimum [Member] | |
| Mortgage Loans on Real Estate [Line Items] | |
| Initially established percentage of unpaid principal balance of loans sold under recourse obligation losses | 3.50% |
| Increase to maximum percentage of outstanding unpaid principal balance | 4.50% |
| Maximum [Member] | |
| Mortgage Loans on Real Estate [Line Items] | |
| Initially established percentage of unpaid principal balance of loans sold under recourse obligation losses | 4.00% |
| Increase to maximum percentage of outstanding unpaid principal balance | 5.00% |