Loans and Allowance for Credit Losses - Summary of Aging of Loans and Loans Held for Sale (Parenthetical) (Detail) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Receivables [Abstract] | ||
| Capitalized loan origination costs and fees | $ 59.7 | $ 52.0 |