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Investments (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($) security item	Dec. 31, 2023 USD ($) security	Sep. 30, 2023 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 466,485	$ 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	534	564
Fair value of temporarily impaired securities	$ 430,907	$ 458,186
Unrealized Losses	37,352	49,554	$ 12,200
Equity securities	655	427
Corporate [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 24,321	$ 23,198
Number of debt securities | security	50	51
Fair value of temporarily impaired securities	$ 23,335	$ 23,198
Unrealized Losses	2,031	3,138
Public Funds And Trust Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 233,800	$ 207,400
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of equity investments | item	1

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