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Allowance for Loan Losses - Schedule of Investment in Loans Receivable by Loan Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Financial Receivables [Line Items]    
Loan Receivable Ending Balance $ 1,358,935 $ 1,249,435
Loan Receivable Ending Balance: Individually Evaluated for Impairment 1,231 1,447
Loan Receivable Ending Balance: Collectively Evaluated for Impairment 1,357,704 1,247,988
Residential Real Estate [Member]    
Schedule Of Financial Receivables [Line Items]    
Loan Receivable Ending Balance 300,390 182,499
Loan Receivable Ending Balance: Individually Evaluated for Impairment 147 301
Loan Receivable Ending Balance: Collectively Evaluated for Impairment 300,243 182,198
Commercial Real Estate [Member]    
Schedule Of Financial Receivables [Line Items]    
Loan Receivable Ending Balance 534,187 467,930
Loan Receivable Ending Balance: Individually Evaluated for Impairment 1,076 1,088
Loan Receivable Ending Balance: Collectively Evaluated for Impairment 533,111 466,842
Real Estate Construction Land And Land Development [Member]    
Schedule Of Financial Receivables [Line Items]    
Loan Receivable Ending Balance 337,173 324,906
Loan Receivable Ending Balance: Collectively Evaluated for Impairment 337,173 324,906
Commercial and Industrial Sector [Member]    
Schedule Of Financial Receivables [Line Items]    
Loan Receivable Ending Balance 164,014 [1] 230,027 [2]
Loan Receivable Ending Balance: Individually Evaluated for Impairment 8 [1] 58 [2]
Loan Receivable Ending Balance: Collectively Evaluated for Impairment 164,006 [1] 229,969 [2]
Consumer Loan [Member]    
Schedule Of Financial Receivables [Line Items]    
Loan Receivable Ending Balance 23,171 44,073
Loan Receivable Ending Balance: Collectively Evaluated for Impairment $ 23,171 $ 44,073
[1] No allowance assigned to the $58.3 in PPP loans due to SBA guarantee
[2] No allowance assigned to the $135.2 in PPP loans due to SBA guarantee