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Investments (Amortized Cost And Fair Value Of Debt Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 510,036	$ 548,333
Fair Value	457,767	$ 486,836
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Due after one year through five years, Amortized cost	10,911
Due after five years through ten years, Amortized cost	144,217
Due after ten years, Amortized cost	125,373
Amortized cost	280,501
Due after one year through five years, Fair value	9,946
Due after five years through ten years, Fair value	127,268
Due after ten years, Fair value	106,553
Fair Value	243,767
Mortgage And Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Mortgage-backed securities, Amortized cost	229,535
Mortgage-backed securities, Fair value	$ 214,000

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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