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Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assumed Gain/(Loss) From Loan Sale | $ 2,770 |
Interest Rate Movement Effect | (3,640) |
Servicing Rights Value | 11,519 |
Security Price Change | 3,403 |
Total Fair Value Measurement Gain/(Loss) | 14,052 | $ 15,583
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 | 961,557 |
Assumed Gain/(Loss) From Loan Sale | 1,912 |
Interest Rate Movement Effect | (2,466) |
Servicing Rights Value | 8,516 |
Total Fair Value Measurement Gain/(Loss) | 7,962 |
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 | 1,107,575 |
Security Price Change | 3,403 |
Total Fair Value Measurement Gain/(Loss) | 3,403 |
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/(Loss) From Loan Sale | 858 |
Interest Rate Movement Effect | (1,174) |
Servicing Rights Value | 3,003 |
Fair value, option, changes in fair value, gain (loss) | 2,687 | 10,042
Fair Value, principal amount, loans held for sale | $ 284,838 | $ 439,718

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