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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 6,855 $ 6,972
Recorded Investment with no Allowance 5,482 5,483
Recorded Investment with Allowance 439 588
Total recorded investment 5,921 6,071
Related Allowance 29 34
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,924 2,982
Recorded Investment with no Allowance 2,489 2,541
Recorded Investment with Allowance 10 16
Total recorded investment 2,499 2,557
Related Allowance 10 16
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,921 2,952
Recorded Investment with no Allowance 2,416 2,471
Recorded Investment with Allowance 170 176
Total recorded investment 2,586 2,647
Related Allowance 18 17
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,010 1,024
Recorded Investment with no Allowance 577 457
Recorded Investment with Allowance 259 396
Total recorded investment 836 853
Related Allowance 1 $ 1
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 14  
Recorded Investment with no Allowance 14  
Total recorded investment $ 14