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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost $ 1,173,967 $ 1,152,852  
Allowance for Expected Credit Losses (683) (920) $ (489)
Gross Unrealized Gains 52 278  
Gross Unrealized Losses (141,778) (137,584)  
Fair Value 1,031,558 1,014,626  
U.S. government obligations and agencies      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 25,950 12,602  
Allowance for Expected Credit Losses 0 0  
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (1,193) (938)  
Fair Value 24,757 11,664  
Corporate bonds      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 791,691 788,737  
Allowance for Expected Credit Losses (537) (729)  
Gross Unrealized Gains 37 130  
Gross Unrealized Losses (91,834) (93,077)  
Fair Value 699,357 695,061  
Mortgage-backed and asset-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 328,327 327,166  
Allowance for Expected Credit Losses 0 0  
Gross Unrealized Gains 15 148  
Gross Unrealized Losses (44,571) (39,707)  
Fair Value 283,771 287,607  
Municipal bonds      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 17,139 14,924  
Allowance for Expected Credit Losses (4) (2)  
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (2,422) (2,551)  
Fair Value 14,713 12,371  
Redeemable preferred stock      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 10,860 9,423  
Allowance for Expected Credit Losses (142) (189) $ (117)
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (1,758) (1,311)  
Fair Value $ 8,960 $ 7,923