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Investments in Securities and Fair Value Investments in Securities (Schedule of Gross Realized Gains and Losses on Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Debt and equity securities, realized gains | $ 1,952 | $ 3,458
Debt securities, realized losses | (33) | 0
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings | 0 | (482)
Debt and equity securities, realized losses | (1,041) | (3,147)
Debt and equity securities, net realized gain (loss) | 911 | 311
Gross gains on sales of other investments | 958 | 31
Gross losses on sales of other investments | 0 | (9)
Net gains (losses) on sales of other investments | 958 | 22
Net realized investment gains (losses) | 1,869 | 333
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, realized gains | 52 | 30
Common stocks and nonredeemable preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, realized gains | 1,900 | 3,428
Equity Securities, FV-NI, Realized Loss | (1,008) | (2,665)
Other than temporary impairment of securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings | $ 0 | $ (482)

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