Liability for Losses under Representations and Warranties - Summary of Company's Liability for Losses under Representations and Warranties (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Mortgage Banking [Abstract] | ||||
| Balance, beginning of period | $ 5,240 | $ 5,064 | $ 5,284 | $ 6,886 |
| Provision for losses: | ||||
| Pursuant to loan sales | 302 | 222 | 960 | 753 |
| Reduction in liability due to change in estimate | (323) | (39) | (1,010) | (2,119) |
| Losses incurred | 0 | (95) | (15) | (368) |
| Balance, end of period | 5,219 | 5,152 | 5,219 | 5,152 |
| UPB of loans subject to representations and warranties at end of period | $ 203,876,164 | $ 216,361,811 | $ 203,876,164 | $ 216,361,811 |