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Goodwill and Intangible Assets - Schedule of Estimated Amortization Expense (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]    
2021 $ 1,017,000  
2022 994,000  
2023 966,000  
2024 928,000  
2025 832,000  
Thereafter 3,338,000  
Net Carrying Amount 8,075,000  
MSRs [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
2021 126,000  
2022 126,000  
2023 125,000  
2024 124,000  
2025 124,000  
Thereafter 1,621,000  
Net Carrying Amount 2,246,000  
Core deposit intangibles [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
2021 891,000  
2022 868,000  
2023 841,000  
2024 804,000  
2025 708,000  
Thereafter 1,717,000  
Net Carrying Amount $ 5,829,000 $ 6,743,000