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Investments in Securities - Gross Unrealized Losses and Estimated Fair Value of Available for Sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value    
Less than 12 months $ 39,266 $ 2,924
Greater than or equal to 12 months 4,749 5,185
Total 44,015 8,109
Unrealized Losses    
Less than 12 months (623) (17)
Greater than or equal to 12 months (43) (28)
Unrealized Losses $ (666) $ (45)