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Investments (Realized Gains (Losses)) (Details) | 3 Months Ended
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Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($)
Gain (Loss) on Securities [Line Items] |  |
Proceeds from Sale of Debt Securities, Available-for-sale | $ 2,865,000 | $ 1,100,000
Debt Securities [Member] |  |
Gain (Loss) on Securities [Line Items] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff | 0 | 0
Proceeds from Sale of Debt Securities, Available-for-sale | 2,865,000 | 1,100,000
Debt Securities, Available-for-sale, Realized Gain | 5,000 | 0
Debt Securities, Available-for-sale, Realized Loss | $ 12,000 | $ 0
Number of Debt Securities Sold | 4 | 1

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