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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 0 | $ 0 | $ 0

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