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Investments (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) item security	Dec. 31, 2023 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 462,951	$ 472,503
Number of investments in a single issuer exceeds 10% of shareholders' equity | item	0
Percent of shareholders equity benchmark for investments in a single issuer	10.00%
Number of debt securities | security	550	564
Fair value of temporarily impaired securities	$ 437,497	$ 458,186
Unrealized Losses	49,987	49,554
Equity securities	386	427
Corporate [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 23,452	$ 23,198
Number of debt securities | security	50	51
Fair value of temporarily impaired securities	$ 22,470	$ 23,198
Unrealized Losses	2,890	3,138
Public Funds And Trust Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 204,400	$ 207,400
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of equity investments | item	1

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