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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, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, related allowance $ 167 $ 241
Impaired financing receivable, recorded investment 1,449 1,408
Impaired financing receivable, unpaid principal balance 1,449 1,408
Impaired financing receivable, average recorded investment 1,408 1,547
Impaired financing receivable, interest income recognized 36 14
Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with an allowance recorded, recorded investment 490 280
Impaired financing receivable, with an allowance recorded, unpaid principal balance 490 280
Impaired financing receivable, related allowance 70 143
Impaired financing receivable, with an allowance recorded, average recorded investment 375 286
Impaired financing receivable, with an allowance recorded, interest income recognized 1 2
Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no specific allowance recorded, recorded investment 624 395
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 624 395
Impaired financing receivable, with no specific allowance recorded, average recorded investment 696 527
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 28 7
Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with an allowance recorded, recorded investment 335 733
Impaired financing receivable, with an allowance recorded, unpaid principal balance 335 733
Impaired financing receivable, related allowance 97 98
Impaired financing receivable, with an allowance recorded, average recorded investment 337 734
Impaired financing receivable, with an allowance recorded, interest income recognized $ 7 $ 5