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Loans and Allowance for Loan Losses - Summary of Impaired Financing Receivables (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable Impaired [Line Items]    
Impaired financing receivable, related allowance   $ 144
Impaired financing receivable, recorded investment $ 5,692 2,331
Impaired financing receivable, unpaid principal balance 5,752 2,835
Impaired financing receivable, with an allowance recorded, average recorded investment 5,217 2,991
Impaired financing receivable, interest income recognized 63 6
Real Estate [Member] | Construction, Commercial [Member]    
Financing Receivable Impaired [Line Items]    
Impaired financing receivable, with no specific allowance recorded, recorded investment 540  
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 539  
Impaired financing receivable, with no specific allowance recorded, average recorded investment 542  
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 8  
Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable Impaired [Line Items]    
Impaired financing receivable, with no specific allowance recorded, recorded investment 1,391 1,645
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 1,460 2,030
Impaired financing receivable, with no specific allowance recorded, average recorded investment 1,384 2,091
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 14 4
Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable Impaired [Line Items]    
Impaired financing receivable, with no specific allowance recorded, recorded investment 592 452
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 591 571
Impaired financing receivable, with no specific allowance recorded, average recorded investment 583 538
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 6 2
Real Estate [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Impaired financing receivable, with no specific allowance recorded, recorded investment 3,169  
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 3,162  
Impaired financing receivable, with no specific allowance recorded, average recorded investment 3,250  
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method $ 35  
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