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Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assumed Gain From Loan Sale | $ 4,902 |
Interest Rate Movement Effect | 12,458 |
Servicing Rights Value | 30,591 |
Security Price Change | (3,088) |
Total Fair Value Measurement Gain/(Loss) | 44,863 | $ 49,034
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 | 2,098,953 |
Assumed Gain From Loan Sale | 3,864 |
Interest Rate Movement Effect | 8,141 |
Servicing Rights Value | 26,206 |
Total Fair Value Measurement Gain/(Loss) | 38,211 |
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 | 2,045,587 |
Security Price Change | (3,088) |
Total Fair Value Measurement Gain/(Loss) | (3,088) |
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 | 1,038 |
Interest Rate Movement Effect | 4,317 |
Servicing Rights Value | 4,385 |
Fair value, option, changes in fair value, gain (loss) | 9,740 | 6,349
Fair Value, principal amount, loans held for sale | $ 322,770 | $ 216,211

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