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Loans and Allowance for Loan Losses - Summary of Impaired Financing Receivables (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Financing Receivable Impaired [Line Items]          
Impaired financing receivable, related allowance $ 444   $ 444   $ 144
Impaired financing receivable, recorded investment 7,616   7,616   2,331
Impaired financing receivable, unpaid principal balance 7,616   7,616   2,835
Impaired financing receivable, with an allowance recorded, average recorded investment 7,230 $ 1,222 7,375 $ 1,222  
Impaired financing receivable, interest income recognized 84   169 3  
Real Estate [Member] | Mortgage, Commercial [Member]          
Financing Receivable Impaired [Line Items]          
Impaired financing receivable, with no specific allowance recorded, recorded investment 182   182   1,645
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 182   182   2,030
Impaired financing receivable, related allowance 387   387    
Impaired financing receivable, with an allowance recorded, recorded investment 1,188   1,188    
Impaired financing receivable, with an allowance recorded, unpaid principal balance 1,188   1,188    
Impaired financing receivable, with no specific allowance recorded, average recorded investment 185   210    
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 3   7    
Impaired financing receivable, with an allowance recorded, average recorded investment 1,207   1,211    
Impaired financing receivable, with an allowance recorded, interest income recognized 17   34    
Real Estate [Member] | Construction, Commercial [Member]          
Financing Receivable Impaired [Line Items]          
Impaired financing receivable, with no specific allowance recorded, recorded investment 535   535    
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 535   535    
Impaired financing receivable, with no specific allowance recorded, average recorded investment 537   539    
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 8   16    
Real Estate [Member] | Mortgage, Residential [Member]          
Financing Receivable Impaired [Line Items]          
Impaired financing receivable, with no specific allowance recorded, recorded investment 919   919   452
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 919   919   571
Impaired financing receivable, related allowance 57   57    
Impaired financing receivable, with an allowance recorded, recorded investment 57   57    
Impaired financing receivable, with an allowance recorded, unpaid principal balance 57   57    
Impaired financing receivable, with no specific allowance recorded, average recorded investment 920 581 890 581  
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method 7   13    
Impaired financing receivable, with an allowance recorded, average recorded investment 57 376 116 376  
Impaired financing receivable, with an allowance recorded, interest income recognized       2  
Real Estate [Member] | Commercial and Industrial [Member]          
Financing Receivable Impaired [Line Items]          
Impaired financing receivable, with no specific allowance recorded, recorded investment 4,735   4,735   234
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 4,735   4,735   234
Impaired financing receivable, related allowance         $ 144
Impaired financing receivable, with no specific allowance recorded, average recorded investment 4,324   4,409    
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method $ 49   $ 99    
Impaired financing receivable, with an allowance recorded, average recorded investment   $ 265   265  
Impaired financing receivable, with an allowance recorded, interest income recognized       $ 1