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Loans and Allowance for Loan Losses - Summary of Impaired Financing Receivables (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, related allowance $ 241  
Impaired financing receivable, recorded investment 1,408 $ 1,946
Impaired financing receivable, unpaid principal balance 1,408 1,946
Impaired financing receivable, average recorded investment 1,547 2,067
Impaired financing receivable, interest income recognized 14 64
Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with an allowance recorded, recorded investment 280  
Impaired financing receivable, with an allowance recorded, unpaid principal balance 280  
Impaired financing receivable, related allowance 143  
Impaired financing receivable, with an allowance recorded, average recorded investment 286  
Impaired financing receivable, with an allowance recorded, interest income recognized 2  
Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no specific allowance recorded, recorded investment 395 1,946
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 395 1,946
Impaired financing receivable, with no specific allowance recorded, average recorded investment 527 2,067
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 7 $ 64
Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with an allowance recorded, recorded investment 733  
Impaired financing receivable, with an allowance recorded, unpaid principal balance 733  
Impaired financing receivable, related allowance 98  
Impaired financing receivable, with an allowance recorded, average recorded investment 734  
Impaired financing receivable, with an allowance recorded, interest income recognized $ 5