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Business Combination & Asset Purchase - Schedule of Future Amortization of Core Deposit Intangible Assets (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
Customer Lists [Member]  
Business Acquisition [Line Items]  
2021 $ 123
2022 123
2023 123
2024 123
2025 123
Thereafter 169
Total 784
Geneva [Member]  
Business Acquisition [Line Items]  
2021 560
2022 560
2023 560
2024 560
2025 560
Total $ 2,800