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Goodwill and Intangibles - Schedule of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]    
Net carrying value $ 2,922  
Core Deposits [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying value 2,776 $ 2,776
Accumulated amortization 1,366 875
Net carrying value 1,410 1,901
Other [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying value 2,528 2,339
Accumulated amortization 1,016 522
Net carrying value $ 1,512 $ 1,817