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Loans - Allowances for Loan Losses and Ending Balances by Portfolio Class and Based on Impairment Method (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 32   $ 34      
Allowance for loan losses collectively evaluated for impairment 8,323   6,983      
Total ending allowance balance 8,355 $ 7,835 7,017 $ 6,776 $ 6,537 $ 5,907
Loans individually evaluated for impairment 5,125   6,059      
Loans collectively evaluated for impairment 624,483   545,074      
Total ending loans balance 629,608   551,133      
Commercial [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses individually evaluated for impairment 6   16      
Allowance for loan losses collectively evaluated for impairment 1,840   2,392      
Total ending allowance balance 1,846 2,266 2,408 2,343 2,267 2,178
Loans individually evaluated for impairment 1,944   2,555      
Loans collectively evaluated for impairment 209,703   134,559      
Total ending loans balance 211,647   137,114      
Commercial Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses individually evaluated for impairment 20   17      
Allowance for loan losses collectively evaluated for impairment 3,301   2,136      
Total ending allowance balance 3,321 2,781 2,153 2,038 1,946 1,791
Loans individually evaluated for impairment 2,394   2,637      
Loans collectively evaluated for impairment 192,099   194,111      
Total ending loans balance 194,493   196,748      
Residential Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses individually evaluated for impairment 1   1      
Allowance for loan losses collectively evaluated for impairment 1,195   1,151      
Total ending allowance balance 1,196 1,585 1,152 1,157 1,229 1,245
Loans individually evaluated for impairment 643   853      
Loans collectively evaluated for impairment 175,613   173,406      
Total ending loans balance 176,256   174,259      
Construction & Land Development [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses collectively evaluated for impairment 566   203      
Total ending allowance balance 566 337 203 116 104 258
Loans collectively evaluated for impairment 28,875   23,960      
Total ending loans balance 28,875   23,960      
Consumer [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses individually evaluated for impairment 5          
Allowance for loan losses collectively evaluated for impairment 409   481      
Total ending allowance balance 414 516 481 333 341 306
Loans individually evaluated for impairment 144   14      
Loans collectively evaluated for impairment 18,193   19,038      
Total ending loans balance 18,337   19,052      
Unallocated [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses collectively evaluated for impairment 1,012   620      
Total ending allowance balance $ 1,012 $ 350 $ 620 $ 789 $ 650 $ 129