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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%

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