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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | $ 770 |  |
Individually evaluated loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 5,216 |  | $ 3,683
Fair Value Nonrecurring Basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 5,986 | $ 3,389 |
Total Gains (Losses) | (1,554) | (1,583) |
Fair Value Nonrecurring Basis | Individually evaluated loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 5,216 | 2,942 | 3,683
Total Gains (Losses) | (1,567) | (1,604) | (1,105)
Fair Value Nonrecurring Basis | Foreclosed Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 447 |
Total Gains (Losses) |  | 21 |
Fair Value Nonrecurring Basis | Foreclosed Assets | Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 770 |  |
Total Gains (Losses) | 13 |  |
Fair Value Nonrecurring Basis | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 |
Fair Value Nonrecurring Basis | Level 1 | Individually evaluated loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Fair Value Nonrecurring Basis | Level 1 | Foreclosed Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 |
Fair Value Nonrecurring Basis | Level 1 | Foreclosed Assets | Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 |  |
Fair Value Nonrecurring Basis | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 |
Fair Value Nonrecurring Basis | Level 2 | Individually evaluated loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Fair Value Nonrecurring Basis | Level 2 | Foreclosed Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 |
Fair Value Nonrecurring Basis | Level 2 | Foreclosed Assets | Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 |  |
Fair Value Nonrecurring Basis | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 5,986 | 3,389 |
Fair Value Nonrecurring Basis | Level 3 | Individually evaluated loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 5,216 | 2,942 | $ 3,683
Fair Value Nonrecurring Basis | Level 3 | Foreclosed Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | $ 447 |
Fair Value Nonrecurring Basis | Level 3 | Foreclosed Assets | Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | $ 770 |  |

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