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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 5,773 $ 6,972
Recorded Investment with no Allowance 4,403 5,483
Recorded Investment with Allowance 729 588
Total recorded investment 5,132 6,071
Related Allowance 32 34
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,992 2,982
Recorded Investment with no Allowance 1,794 2,541
Recorded Investment with Allowance 150 16
Total recorded investment 1,944 2,557
Related Allowance 6 16
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,797 2,952
Recorded Investment with no Allowance 2,162 2,471
Recorded Investment with Allowance 235 176
Total recorded investment 2,397 2,647
Related Allowance 20 17
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 838 1,024
Recorded Investment with no Allowance 447 457
Recorded Investment with Allowance 196 396
Total recorded investment 643 853
Related Allowance 1 1
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 146 14
Recorded Investment with no Allowance   14
Recorded Investment with Allowance 148  
Total recorded investment 148 $ 14
Related Allowance $ 5