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Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Total cost $ 18,195 $ 16,743
Less: accumulated depreciation (3,364) (3,092)
Premises and equipment, net 14,831 13,651
Buildings and Land [Member]    
Property Plant And Equipment [Line Items]    
Total cost 13,925 12,535
Construction in Progress [Member]    
Property Plant And Equipment [Line Items]    
Total cost   443
Furniture, Fixtures and Equipment [Member]    
Property Plant And Equipment [Line Items]    
Total cost 3,945 3,411
Software [Member]    
Property Plant And Equipment [Line Items]    
Total cost $ 325 $ 354