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Fair Value - Undesignated Derivative Instruments (Detail) - Mortgage Banking - Level 2 - Fair Value, Recurring - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Other Assets | Rate Lock Commitments |  |
Derivatives, Fair Value [Line Items] |  |
Gross assets | $ 38,740 | $ 34,935
Gross liabilities | 1,098 | 25,739
Net rate lock commitments and forward sales contracts | 37,642 | 9,196
Accrued Liabilities | Forward Sales Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Gross assets | 1,734 | 6,822
Gross liabilities | 3,728 | 1,122
Net rate lock commitments and forward sales contracts | $ (1,994) | $ 5,700

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