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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 6,884 $ 4,621
Investment with no Allowance 5,431 3,122
Investment with Allowance 593 738
Total recorded investment 6,024 3,860
Related Allowance 36 101
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,856 815
Investment with no Allowance 2,424 383
Investment with Allowance 18 36
Total recorded investment 2,442 419
Related Allowance 18 36
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,981 2,616
Investment with no Allowance 2,519 1,976
Investment with Allowance 184 433
Total recorded investment 2,703 2,409
Related Allowance 17 64
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,033 1,190
Investment with no Allowance 474 763
Investment with Allowance 391 269
Total recorded investment 865 1,032
Related Allowance 1 $ 1
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 14  
Investment with no Allowance 14  
Total recorded investment $ 14