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Allowance for Loans Losses - Summary of impaired financing receivables (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, recorded investment $ 1,684 $ 1,946
Impaired financing receivable, unpaid principal balance 1,684 1,946
Impaired financing receivable, related allowance 251  
Impaired financing receivable, average recorded investment 1,542 2,067
Impaired financing receivable, interest income recognized 14 64
Mortgage, residential [Member] | Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no specific allowance recorded, recorded investment 658 1,946
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 658 1,946
Impaired financing receivable, with no specific allowance recorded, average recorded investment 661 2,067
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 7 $ 64
Commercial and industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with an allowance recorded, recorded investment 291  
Impaired financing receivable, with an allowance recorded, unpaid principal balance 291  
Impaired financing receivable, with an allowance recorded, average recorded investment 146  
Impaired financing receivable, with an allowance recorded, interest income recognized 2  
Impaired financing receivable, related allowance 151  
Mortgage, commercial [Member] | Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with an allowance recorded, recorded investment 735  
Impaired financing receivable, with an allowance recorded, unpaid principal balance 735  
Impaired financing receivable, with an allowance recorded, average recorded investment 735  
Impaired financing receivable, with an allowance recorded, interest income recognized 5  
Impaired financing receivable, related allowance $ 100