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Investments (Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale, Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	$ 1,000
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	10,835
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	16,276
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	24,706
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	28,111
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	601,102
Amortized Cost	702,937	$ 796,960
Available-for-sale, Fair Value
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	1,000
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	9,997
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	13,709
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	0
Total	625,808	$ 695,875
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	$ 674,826

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