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INVESTMENTS - Schedule of Credit Quality of Investment Securities With Contractual Maturities or The Issuer of Such Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 1,413,621 $ 1,269,079
% of Total Fair Value 100.00% 100.00%
AAA    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 423,818 $ 378,732
% of Total Fair Value 30.00% 29.90%
AA    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 224,221 $ 146,456
% of Total Fair Value 15.90% 11.50%
A    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 435,769 $ 425,503
% of Total Fair Value 30.80% 33.50%
BBB    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 324,436 $ 313,265
% of Total Fair Value 22.90% 24.70%
No Rating Available    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 5,377 $ 5,123
% of Total Fair Value 0.40% 0.40%