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Merger - Schedule of Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Acquired Finite Lived Intangible Assets [Line Items]    
2020 $ 1,003  
2021 980  
2022 956  
2023 927  
2024 890  
Thereafter 3,549  
Net Carrying Amount 8,305  
Core deposit intangibles [Member]    
Acquired Finite Lived Intangible Assets [Line Items]    
2020 914  
2021 891  
2022 868  
2023 840  
2024 804  
Thereafter 2,426  
Net Carrying Amount 6,743 $ 7,688
UCB [Member] | Core deposit intangibles [Member]    
Acquired Finite Lived Intangible Assets [Line Items]    
2020 842  
2021 823  
2022 800  
2023 773  
2024 742  
Thereafter 2,427  
Net Carrying Amount $ 6,407