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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Servicing assets | $ 6,484 |  | $ 6,420 | $ 6,457 |  | $ 6,683 | $ 6,836 | $ 7,070
Non-recurring Basis |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Collateral dependent loans | 11,821 | [1] |  | 3,467 | [2] |  |  |
Other real estate owned | 1,995 |  |  | 117 |  |  |  |
Repossessed personal property | 412 |  |  | 568 |  |  |  |
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 | 11,821 | [1] |  | 3,467 | [2] |  |  |
Other real estate owned | 1,995 |  |  | 117 |  |  |  |
Repossessed personal property | $ 412 |  |  | $ 568 |  |  |  |
[1] | Consisted of real estate loans of $11.8 million.
[2] | Consisted of real estate loans of $3.5 million.

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