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RESERVE FOR UNPAID LOSS AND LOSS ADJUSTMENT EXPENSES - Schedule of Table Represents an Analysis of Loss and Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Reserve for unpaid loss and loss adjustment expenses at beginning of period / year $ 798,339 $ 794,243 $ 794,243  
Reinsurance recoverables on unpaid loss and loss adjustment expenses, net of allowance for expected credit losses (226,233) (213,663) (213,663)  
Net reserve for unpaid loss and loss adjustment expenses at beginning of period / year 603,321 559,940 572,106 $ 580,580
Loss and loss adjustment expenses incurred, net of reinsurance:        
Current accident year 157,707 143,370 251,592  
Prior accident years (30,562) (19,574) (35,810)  
Net loss and loss adjustment expenses 127,145 123,796 215,782  
Loss and loss adjustment expenses paid, net of reinsurance:        
Current accident year (5,784) (13,333) (36,088)  
Prior accident years (90,146) (131,103) (188,119)  
Net loss and loss adjustment expenses paid (95,930) (144,436) (224,207)  
Change in allowance for expected credit losses on reinsurance recoverables on unpaid loss and loss adjustment expenses 0 0 (49)  
Reinsurance recoverables on unpaid loss and loss adjustment expenses, net of allowance for expected credit losses 239,567 241,556 226,233  
Reserve for unpaid loss and loss adjustment expenses at end of period / year $ 842,888 $ 801,496 $ 798,339