Investments (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) security item	Dec. 31, 2024 USD ($) security	Mar. 31, 2024 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 495,487	$ 508,604
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	523	538
Fair Value	$ 460,420	$ 476,913
Unrealized Losses	39,204	45,710	$ 6,500
Equity securities		166
Public Funds And Trust Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 206,200	$ 207,200