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Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assumed Gain/(Loss) From Loan Sale | $ 6,059 |
Interest Rate Movement Effect | 2,105 |
Servicing Rights Value | 11,263 |
Security Price Change | (1,604) |
Total Fair Value Measurement Gain/(Loss) | 17,823 | $ 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 | 1,130,241 |
Assumed Gain/(Loss) From Loan Sale | 4,469 |
Interest Rate Movement Effect | 1,942 |
Servicing Rights Value | 8,317 |
Total Fair Value Measurement Gain/(Loss) | 14,728 |
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 | 1,263,416 |
Security Price Change | (1,604) |
Total Fair Value Measurement Gain/(Loss) | (1,604) |
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 | 1,590 |
Interest Rate Movement Effect | 163 |
Servicing Rights Value | 2,946 |
Fair value, option, changes in fair value, gain (loss) | 4,699 | 10,042
Fair Value, principal amount, loans held for sale | $ 339,981 | $ 439,718

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