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Securities - Schedule of Other Investments Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Securities [Line Items]    
Equity investment in mutual fund with readily determinable fair value $ 3,700 $ 3,800
Other Investments    
Securities [Line Items]    
Federal Home Loan Bank stock 7,005 6,043
Pacific Coast Bankers Bank stock 190 190
Equity investment in mutual fund with readily determinable fair value 3,734 3,773
Total other investment securities $ 10,929 $ 10,006