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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Servicing assets | $ 6,683 |  | $ 6,836 | $ 7,070 |  | $ 7,156 | $ 7,352 | $ 7,176
Non-recurring Basis |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Collateral dependent loans | 5,016 | [1] |  | 7,352 | [2] |  |  |
Other real estate owned | 772 |  |  | 117 |  |  |  |
Repossessed personal property | 1,216 |  |  | 1,305 |  |  |  |
Non-recurring Basis | Quoted Prices in Active Markets for Identical Assets |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Collateral dependent loans | 0 | [1] |  | 0 | [2] |  |  |
Other real estate owned | 0 |  |  | 0 |  |  |  |
Repossessed personal property | 0 |  |  | 0 |  |  |  |
Non-recurring Basis | Significant Observable Inputs with No Active Market with Identical Characteristics |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Collateral dependent loans | 0 | [1] |  | 0 | [2] |  |  |
Other real estate owned | 0 |  |  | 0 |  |  |  |
Repossessed personal property | 0 |  |  | 0 |  |  |  |
Non-recurring Basis | Significant Unobservable Inputs |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Collateral dependent loans | 5,016 | [1] |  | 7,352 | [2] |  |  |
Other real estate owned | 772 |  |  | 117 |  |  |  |
Repossessed personal property | $ 1,216 |  |  | $ 1,305 |  |  |  |
[1] | Consisted of real estate loans of $5.0 million.
[2] | Consisted of real estate loans of $2.2 million and commercial and industrial loans of $5.2 million.

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