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Investments (Amortized Cost And Fair Value Of Debt Securities, By Contractual Maturity) (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 540,006,000 $ 384,369,000
Fair Value 545,788,000 $ 396,940,000
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, Amortized cost 2,613,000  
Due after one year through five years, Amortized cost 21,770,000  
Due after five years through ten years, Amortized cost 268,783,000  
Due after ten years, Amortized cost 48,015,000  
Amortized cost 341,181,000  
Due in one year or less, Fair value 2,644,000  
Due after one year through five years, Fair value 22,368,000  
Due after five years through ten years, Fair value 274,542,000  
Due after ten years, Fair value 47,324,000  
Fair Value 346,878,000  
Mortgage-Backed And Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Mortgage-backed securities, Amortized cost 198,825,000  
Mortgage-backed securities, Fair value $ 198,910,000