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Fair Value of Financial Instruments Transfers between Levels (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Transfers between Levels      
Transfers from Level 1 to Level 2 $ 0 $ 0  
Transfers from Level 2 to Level 1 0 0  
Changes in the Company's Level 3 fair value securities      
Balance at beginning of period 1,698 516 $ 680
Purchases   1,182 133
Sales     (297)
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Balance at end of period 1,698 1,698 $ 516
Alternative investments fair value $ 38,570 $ 32,158  
Period of advance notice before quarter end 45 days