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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 6,935 $ 6,972
Recorded Investment with no Allowance 5,193 5,483
Recorded Investment with Allowance 755 588
Total recorded investment 5,948 6,071
Related Allowance 33 34
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,899 2,982
Recorded Investment with no Allowance 2,281 2,541
Recorded Investment with Allowance 183 16
Total recorded investment 2,464 2,557
Related Allowance 6 16
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,968 2,952
Recorded Investment with no Allowance 2,363 2,471
Recorded Investment with Allowance 241 176
Total recorded investment 2,604 2,647
Related Allowance 19 17
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 920 1,024
Recorded Investment with no Allowance 549 457
Recorded Investment with Allowance 180 396
Total recorded investment 729 853
Related Allowance 1 1
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 148 14
Recorded Investment with no Allowance   14
Recorded Investment with Allowance 151  
Total recorded investment 151 $ 14
Related Allowance $ 7