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Investments (Realized Gains (Losses)) (Details) | 3 Months Ended
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Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($)
Gain (Loss) on Securities [Line Items] |  |
Proceeds from Sale of Debt Securities, Available-for-sale | $ 1,100,000 | $ 4,445,000
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 | 1,100,000 | 7,254,000
Debt Securities, Available-for-sale, Realized Gain | 0 | 100,000
Debt Securities, Available-for-sale, Realized Loss | $ 0 | $ 1,000
Available-for-sale Securities |  |
Gain (Loss) on Securities [Line Items] |  |
Number of Debt Securities Sold | 1 | 18

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- Definition Amount of writeoff of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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