Loans and Allowance for Loan Losses - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
contract
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
contract
Sep. 30, 2020
USD ($)
contract
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
contract
Loans and Allowance for Loan Losses                
Number of loans | loan 7 7 7   7 7 7  
Aggregate partial charge-offs loan $ 158,000 $ 158,000 $ 158,000   $ 158,000 $ 158,000 $ 158,000  
Value of estimated to exceed $ 100,000 $ 100,000 100,000   $ 100,000 $ 100,000 100,000  
Number of loans modified 2 2     6 89   1,000
Outstanding principal $ 18,600,000 $ 18,600,000 18,600,000 $ 0 $ 18,600,000 $ 18,600,000 18,600,000 $ 0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     0 0     0 0
Financing Receivable, Troubled Debt Restructuring, Modified Allowance for Credit Loss     $ 0 $ 0     $ 0 $ 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contract 0     0 0     0