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Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assumed Gain From Loan Sale | $ 4,069 |  |
Interest Rate Movement Effect | (105,305) |  |
Servicing Rights Value | 34,827 |  |
Security Price Change | 38,388 |  |
Total Fair Value Measurement | (28,021) |  | $ 18,237
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 | 2,213,239 |  |
Assumed Gain From Loan Sale | 3,359 |  |
Interest Rate Movement Effect | (85,498) |  |
Servicing Rights Value | 30,137 |  |
Total Fair Value Measurement | (52,002) |  |
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 | 2,446,322 |  |
Security Price Change | 38,388 |  |
Total Fair Value Measurement | 38,388 |  |
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 | 710 |  |
Interest Rate Movement Effect | (19,807) |  |
Servicing Rights Value | 4,690 |  |
Fair value, option, changes in fair value, gain (loss) | (14,407) | $ 4,296 |
Fair Value, principal amount, loans held for sale | $ 330,501 | $ 297,896 |

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