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Deposits - Schedule of Maturities of Time Deposits (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Deposits [Abstract]    
Remainder of 2021 $ 6,973  
2022 68,581  
2023 209,744  
2024 145,565  
2025 38,595  
Thereafter 24,582  
Time Deposits, Total $ 494,040 $ 563,775