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Securities - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Securities [Line Items]          
Proceeds from sale of AFS securities $ 0 $ 0 $ 0 $ 0  
Equity investment in mutual fund with readily determinable fair value 3,700,000   3,700,000   $ 3,800,000
Other Income          
Securities [Line Items]          
Unrealized holding gains (losses) of mutual fund (14,000) $ 0 (73,000) $ 89,000  
Pledged Securities          
Securities [Line Items]          
Number of pledged securities $ 0   $ 0   $ 0