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Goodwill and Other Intangible Assets - Remaining Estimated Core Deposit Intangible Amortization (Detail) - Core deposit intangibles - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
2021 $ 5,464  
2022 4,776  
2023 4,269  
2024 2,482  
2025 533  
Thereafter 309  
Total $ 17,833 $ 23,557