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Loans and Allowance for Loan Losses - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
Loans And Leases Receivable Disclosure [Line Items]          
Loans, related parties $ 0   $ 0   $ 0
Recorded investment in troubled debt restructurings 320,000   320,000   330,000
Specific reserves to loans classified as TDRs $ 320,000   $ 320,000   330,000
Loans identified as TDRs | loan 0 0 0 0  
Financing receivable, modifications, subsequent default, recorded investment $ 0 $ 0 $ 0 $ 0  
Gross loans receivable 1,235,945,000   1,235,945,000   1,104,108,000
SBA PPP Loan          
Loans And Leases Receivable Disclosure [Line Items]          
Total loans funded 154,500,000   154,500,000    
Loans forgiven (88,800,000)   (88,800,000)    
Home Mortgage          
Loans And Leases Receivable Disclosure [Line Items]          
Gross loans receivable 115,653,000   115,653,000   128,683,000
SBA Loans Non- Real Estate          
Loans And Leases Receivable Disclosure [Line Items]          
Gross loans receivable 85,644,000   85,644,000   $ 75,651,000
SBA Loans Non- Real Estate | SBA PPP Loan          
Loans And Leases Receivable Disclosure [Line Items]          
Gross loans receivable $ 69,300,000   $ 69,300,000