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Borrowings and Subordinated Debentures - Interest Rates and Maturity Dates of FHLB Secured Advances (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Rate 4.86% 0.00%
Borrowings $ 19,750 $ 5,000
FHLB secured advances | Federal Home Loan Bank of San Francisco    
Debt Instrument [Line Items]    
Balance $ 5,000 $ 5,000
Rate 0.00% 0.00%
Other borrowings    
Debt Instrument [Line Items]    
Rate 6.50% 0.00%
Balance $ 14,750 $ 0
2020 | Federal Home Loan Bank of San Francisco    
Debt Instrument [Line Items]    
Balance $ 5,000 $ 5,000
2020 | FHLB secured advances | Federal Home Loan Bank of San Francisco    
Debt Instrument [Line Items]    
Short-term Debt, Percentage Bearing Fixed Interest Rate 0.00% 0.00%
September 1, 2021 | Other borrowings    
Debt Instrument [Line Items]    
Rate 6.50% 0.00%
Balance $ 8,125 $ 0
October 1, 2021 | Other borrowings    
Debt Instrument [Line Items]    
Rate 6.50% 0.00%
Balance $ 6,625 $ 0