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Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assumed Gain From Loan Sale | $ 4,757 |  |
Interest Rate Movement Effect | 12,561 |  |
Servicing Rights Value | 31,610 |  |
Security Price Change | (14,175) |  |
Total Fair Value Measurement Gain/(Loss) | 34,753 |  | $ (7,435)
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 | 2,263,642 |  |
Assumed Gain From Loan Sale | 4,000 |  |
Interest Rate Movement Effect | 12,007 |  |
Servicing Rights Value | 27,486 |  |
Total Fair Value Measurement Gain/(Loss) | 43,493 |  |
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 | 2,227,677 |  |
Security Price Change | (14,175) |  |
Total Fair Value Measurement Gain/(Loss) | (14,175) |  |
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 | 757 |  |
Interest Rate Movement Effect | 554 |  |
Servicing Rights Value | 4,124 |  |
Fair value, option, changes in fair value, gain (loss) | 5,435 | $ 2,675 |
Fair Value, principal amount, loans held for sale | $ 313,813 | $ 319,481 |

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