v3.26.1
BORROWINGS (Unsecured Junior Subordinated Debentures) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Mar. 31, 2026
Dec. 31, 2025
Dec. 13, 2016
Debt Instrument [Line Items]        
Face amount of debt issued   $ 789,943,000 $ 1,343,859,000  
Unsecured Junior Subordinated Debentures | RCT I entity        
Debt Instrument [Line Items]        
Face amount of debt issued       $ 25,800,000
Debt issuance costs, amortization period (in years) 10 years      
Unamortized debt issuance costs   $ 0 $ 0  
Interest rate at period end   7.91% 7.90%  
Unsecured Junior Subordinated Debentures | RCT II entity        
Debt Instrument [Line Items]        
Face amount of debt issued       $ 25,800,000
Debt issuance costs, amortization period (in years) 10 years      
Unamortized debt issuance costs   $ 0 $ 0  
Interest rate at period end   7.88% 8.05%