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Investments (Amortized Cost And Fair Value Of Debt Securities, By Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 556,994 $ 525,717
Fair Value 492,032 $ 529,811
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, Amortized cost 3,971  
Due after one year through five years, Amortized cost 14,689  
Due after five years through ten years, Amortized cost 150,057  
Due after ten years, Amortized cost 153,269  
Amortized cost 321,986  
Due in one year or less, Fair value 3,942  
Due after one year through five years, Fair value 14,121  
Due after five years through ten years, Fair value 130,188  
Due after ten years, Fair value 125,541  
Fair Value 273,792  
Mortgage And Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Mortgage-backed securities, Amortized cost 235,008  
Mortgage-backed securities, Fair value $ 218,240