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Investment in Securities - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
position
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
position
Sep. 30, 2020
USD ($)
Dec. 31, 2020
position
Investments, Debt and Equity Securities [Abstract]          
Available-for-sale securities, number of positions | position 66   66   0
Available-for-sale securities, percentage of total securities 20.00%   20.00%    
Available-for-sale securities, number of positions, greater than one year | position 0   0    
Proceeds from sales of securities available-for-sale $ 30,074,000 $ 0 $ 43,190,000 $ 19,629,000  
Available-for-sale securities, gross realized losses $ 1,000 $ 0      
Available-for-sale securities, gross realized gains     $ 44,000 $ 1,069,000