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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, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |
Debt and equity securities, realized gains | $ 11,020 | $ 1,952
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings | (172) | 0
Debt and equity securities, realized losses | (919) | (1,041)
Debt and equity securities, net realized gain (loss) | 10,101 | 911
Gains (losses) on other assets and investments | (366) | 958
Gain (Loss) on Disposition of Other Assets | (366) | 958
Net realized investment gains (losses) | 9,735 | 1,869
General obligations of U.S. states, territories and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, realized losses | (353) | 0
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, realized gains | 0 | 52
Debt securities, realized losses | (104) | (33)
Common stocks and nonredeemable preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, realized gains | 11,020 | 1,900
Equity Securities, FV-NI, Realized Loss | (290) | (1,008)
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 | $ (172) | $ 0

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