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Loans - Allowances for Loan Losses and Ending Balances by Portfolio Class and Based on Impairment Method (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses individually evaluated for impairment $ 33   $ 34      
Allowance for loan losses collectively evaluated for impairment 7,802   6,983      
Total ending allowance balance 7,835 $ 7,120 7,017 $ 6,537 $ 6,287 $ 5,907
Loans individually evaluated for impairment 5,935   6,059      
Loans collectively evaluated for impairment 632,925   545,074      
Total ending loans balance 638,860   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 2,260   2,392      
Total ending allowance balance 2,266 2,609 2,408 2,267 1,997 2,178
Loans individually evaluated for impairment 2,465   2,555      
Loans collectively evaluated for impairment 212,674   134,559      
Total ending loans balance 215,139   137,114      
Commercial Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses individually evaluated for impairment 19   17      
Allowance for loan losses collectively evaluated for impairment 2,762   2,136      
Total ending allowance balance 2,781 2,300 2,153 1,946 1,808 1,791
Loans individually evaluated for impairment 2,596   2,637      
Loans collectively evaluated for impairment 196,352   194,111      
Total ending loans balance 198,948   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 1,584   1,151      
Total ending allowance balance 1,585 1,347 1,152 1,229 1,222 1,245
Loans individually evaluated for impairment 728   853      
Loans collectively evaluated for impairment 177,071   173,406      
Total ending loans balance 177,799   174,259      
Construction & Land Development [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses collectively evaluated for impairment 337   203      
Total ending allowance balance 337 255 203 104 170 258
Loans collectively evaluated for impairment 28,123   23,960      
Total ending loans balance 28,123   23,960      
Consumer [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses individually evaluated for impairment 7          
Allowance for loan losses collectively evaluated for impairment 509   481      
Total ending allowance balance 516 518 481 341 325 306
Loans individually evaluated for impairment 146   14      
Loans collectively evaluated for impairment 18,705   19,038      
Total ending loans balance 18,851   19,052      
Unallocated [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses collectively evaluated for impairment 350   620      
Total ending allowance balance $ 350 $ 91 $ 620 $ 650 $ 765 $ 129