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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost $ 1,162,919 $ 1,152,852  
Allowance for Expected Credit Losses (566) (920) $ (489)
Gross Unrealized Gains 2,115 278  
Gross Unrealized Losses (100,138) (137,584)  
Fair Value 1,064,330 1,014,626  
U.S. government obligations and agencies      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 23,886 12,602  
Allowance for Expected Credit Losses 0 0  
Gross Unrealized Gains 49 0  
Gross Unrealized Losses (677) (938)  
Fair Value 23,258 11,664  
Corporate bonds      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 779,177 788,737  
Allowance for Expected Credit Losses (469) (729)  
Gross Unrealized Gains 1,097 130  
Gross Unrealized Losses (64,091) (93,077)  
Fair Value 715,714 695,061  
Mortgage-backed and asset-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 334,460 327,166  
Allowance for Expected Credit Losses 0 0  
Gross Unrealized Gains 969 148  
Gross Unrealized Losses (32,283) (39,707)  
Fair Value 303,146 287,607  
Municipal bonds      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 15,916 14,924  
Allowance for Expected Credit Losses (4) (2)  
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (1,873) (2,551)  
Fair Value 14,039 12,371  
Redeemable preferred stock      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 9,480 9,423  
Allowance for Expected Credit Losses (93) (189) $ (117)
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (1,214) (1,311)  
Fair Value $ 8,173 $ 7,923