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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets, Other than Goodwill (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 7,831  
Core deposit intangibles [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 8,527 $ 8,527
Accumulated Amortization 2,920 2,698
Net Carrying Amount $ 5,607 $ 5,829