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Goodwill and Other Intangible Assets (Estimated Aggregate Future Amortization Expense for Intangible Assets) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 697  
2022 481  
2023 282  
2024 87  
2025 11  
Thereafter 5  
Finite-Lived Intangible Assets, Net, Total $ 1,563 $ 2,481