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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, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |
Debt and equity securities, realized gains | $ 16,350 | $ 11,020
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings | (201) | (172)
Debt and equity securities, realized losses | (601) | (919)
Debt and equity securities, net realized gain (loss) | 15,749 | 10,101
Gains on other assets and investments | 5 | 0
Losses on other assets and investments | (123) | (366)
Net gains (losses) on sales of other investments | (118) | (366)
Net realized investment gains (losses) | 15,631 | 9,735
Unrealized Gain (Loss) on Investments | (12,183) | (20,961)
Net investment gains (losses) | 3,448 | (11,226)
General obligations of U.S. states, territories and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, realized losses | 0 | (353)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, realized gains | 0 | 0
Debt securities, realized losses | 0 | (104)
Common stocks and nonredeemable preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, realized gains | 16,350 | 11,020
Equity Securities, FV-NI, Realized Loss | $ (400) | $ (290)

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