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Loans and Allowance for Loan Losses - Summary of Impaired Financing Receivables (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable Impaired [Line Items]    
Impaired financing receivable, related allowance $ 144 $ 241
Impaired financing receivable, recorded investment 2,331 1,408
Impaired financing receivable, unpaid principal balance 2,835 1,408
Impaired financing receivable, average recorded investment 2,991 1,547
Impaired financing receivable, interest income recognized 6 14
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 452 395
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 571 395
Impaired financing receivable, with no specific allowance recorded, average recorded investment 538 527
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 2 7
Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable Impaired [Line Items]    
Impaired financing receivable, with no specific allowance recorded, recorded investment 1,645  
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 2,030  
Impaired financing receivable, with no specific allowance recorded, average recorded investment 2,091  
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 4  
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
Real Estate [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Impaired financing receivable, with an allowance recorded, recorded investment 234  
Impaired financing receivable, with an allowance recorded, unpaid principal balance 234  
Impaired financing receivable, related allowance 144  
Impaired financing receivable, with an allowance recorded, average recorded investment $ 362