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Loans and Allowance for Loan Losses - Summary of Impaired Financing Receivables (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Financing Receivable Impaired [Line Items]          
Impaired financing receivable, related allowance         $ 144
Impaired financing receivable, recorded investment $ 8,233   $ 8,233   2,331
Impaired financing receivable, unpaid principal balance 8,332   8,332   2,835
Impaired financing receivable, with an allowance recorded, average recorded investment 8,041 $ 1,408 7,407 $ 1,408  
Impaired financing receivable, interest income recognized 87 29 246 36  
Real Estate [Member] | Mortgage, Commercial [Member]          
Financing Receivable Impaired [Line Items]          
Impaired financing receivable, with no specific allowance recorded, recorded investment 1,333   1,333   1,645
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 1,432   1,432   2,030
Impaired financing receivable, with no specific allowance recorded, average recorded investment 1,378   1,402    
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 21   62    
Impaired financing receivable, with an allowance recorded, average recorded investment   337   337  
Impaired financing receivable, with an allowance recorded, interest income recognized   1   7  
Real Estate [Member] | Construction, Commercial [Member]          
Financing Receivable Impaired [Line Items]          
Impaired financing receivable, with no specific allowance recorded, recorded investment 531   531    
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 531   531    
Impaired financing receivable, with no specific allowance recorded, average recorded investment 532   537    
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 8   24    
Real Estate [Member] | Mortgage, Residential [Member]          
Financing Receivable Impaired [Line Items]          
Impaired financing receivable, with no specific allowance recorded, recorded investment 1,672   1,672   452
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 1,672   1,672   571
Impaired financing receivable, with no specific allowance recorded, average recorded investment 1,421 696 1,078 696  
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 5 28 11 28  
Real Estate [Member] | Commercial and Industrial [Member]          
Financing Receivable Impaired [Line Items]          
Impaired financing receivable, with no specific allowance recorded, recorded investment 4,697   4,697   234
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 4,697   4,697   234
Impaired financing receivable, related allowance         $ 144
Impaired financing receivable, with no specific allowance recorded, average recorded investment 4,710   4,390    
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method $ 53   $ 149    
Impaired financing receivable, with an allowance recorded, average recorded investment   $ 375   375  
Impaired financing receivable, with an allowance recorded, interest income recognized       $ 1