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Goodwill and Other Intangible Assets - Schedule of Estimated Future Amortization Expense (Detail) - Core Deposits
$ in Thousands
Sep. 30, 2023
USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]  
2023 $ 501
2024 1,737
2025 1,465
2026 1,193
2027 955
2028 $ 724