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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost $ 1,146,378 $ 1,152,852  
Allowance for Expected Credit Losses (811) (920) $ (489)
Gross Unrealized Gains 681 278  
Gross Unrealized Losses (119,693) (137,584)  
Fair Value 1,026,555 1,014,626  
U.S. government obligations and agencies      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 16,840 12,602  
Allowance for Expected Credit Losses 0 0  
Gross Unrealized Gains 100 0  
Gross Unrealized Losses (763) (938)  
Fair Value 16,177 11,664  
Corporate bonds      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 782,613 788,737  
Allowance for Expected Credit Losses (622) (729)  
Gross Unrealized Gains 366 130  
Gross Unrealized Losses (79,506) (93,077)  
Fair Value 702,851 695,061  
Mortgage-backed and asset-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 319,916 327,166  
Allowance for Expected Credit Losses 0 0  
Gross Unrealized Gains 200 148  
Gross Unrealized Losses (35,669) (39,707)  
Fair Value 284,447 287,607  
Municipal bonds      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 16,149 14,924  
Allowance for Expected Credit Losses (2) (2)  
Gross Unrealized Gains 15 0  
Gross Unrealized Losses (2,082) (2,551)  
Fair Value 14,080 12,371  
Redeemable preferred stock      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 10,860 9,423  
Allowance for Expected Credit Losses (187) (189) $ (117)
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (1,673) (1,311)  
Fair Value $ 9,000 $ 7,923