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Loans and Allowance for Credit Losses - Troubled Debt Restructuring is 90 Days or More Past Due (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 0 | $ 0 | $ 16
Loans to individuals [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  |  | 16
Automobiles | Loans to individuals [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  |  | $ 16

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