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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Acquired Finite Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 8,305  
Core deposit intangibles [Member]    
Acquired Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 14,792 $ 14,792
Accumulated Amortization 8,049 7,104
Net Carrying Amount $ 6,743 $ 7,688