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Borrowings and Subordinated Debentures - Summary of Borrowings and Debentures (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Borrowings $ 19,750 $ 5,000
Rate 4.86% 0.00%
AFX short-term borrowings    
Debt Instrument [Line Items]    
Balance $ 0 $ 0
Federal Home Loan Bank of San Francisco | FHLB secured advances    
Debt Instrument [Line Items]    
Balance $ 5,000 $ 5,000
Rate 0.00% 0.00%
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance    
Debt Instrument [Line Items]    
Balance $ 0 $ 0