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Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assumed Gain From Loan Sale | $ 5,486 |  |
Interest Rate Movement Effect | 15,121 |  |
Servicing Rights Value | 25,934 |  |
Security Price Change | (1,994) |  |
Total Fair Value Measurement | 44,547 | $ 17,616 |
Mortgage Banking | Level 2 | Fair Value, Recurring | Rate Lock Commitments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 1,714,602 |  |
Assumed Gain From Loan Sale | 4,693 |  |
Interest Rate Movement Effect | 11,660 |  |
Servicing Rights Value | 21,289 |  |
Total Fair Value Measurement | 37,642 |  |
Mortgage Banking | Level 2 | Fair Value, Recurring | Forward Sales Contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 1,728,830 |  |
Security Price Change | (1,994) |  |
Total Fair Value Measurement | (1,994) |  |
Mortgage Banking | Level 2 | Fair Value, Recurring | Mortgages Held for Sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assumed Gain From Loan Sale | 793 |  |
Interest Rate Movement Effect | 3,461 |  |
Servicing Rights Value | 4,645 |  |
Total Fair Value Measurement | 8,899 |  |
Fair Value, principal amount, loans held for sale | $ 332,680 |  | $ 352,489

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