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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Servicing Rights (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]        
2021 $ 923      
2022 666      
2023 409      
2024 267      
2025 144      
Thereafter 49      
Total 2,458      
Servicing Rights [Member]        
Finite-Lived Intangible Assets [Line Items]        
2021 1,675      
2022 1,250      
2023 931      
2024 693      
2025 427      
Thereafter 1,432      
Servicing Asset at Amortized Cost, Amortization 3,325 $ 1,929 $ 1,263  
Servicing Asset at Amortized Cost $ 6,408 $ 6,626 $ 6,768 $ 6,573