Quarterly report [Sections 13 or 15(d)]

INVESTMENT SECURITIES - Schedule of valuation techniques and significant level 3 inputs used in the valuation (Details)

v3.25.4
INVESTMENT SECURITIES - Schedule of valuation techniques and significant level 3 inputs used in the valuation (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Dec. 31, 2025
USD ($)
times
Mar. 31, 2025
USD ($)
times
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities $ 2,183,567 $ 2,275,286
Significant Unobservable Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities 21,623 18,320
Discounted cash flow | Significant Unobservable Units | Corporate equity, 3 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities $ 18,353  
Estimated number of years 3 years  
Discounted cash flow | Significant Unobservable Units | Corporate equity, 3 years | Discount rate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input 0.170  
Discounted cash flow | Significant Unobservable Units | Corporate equity, 3 years | Termination multiplier    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input | times 15.7  
Discounted cash flow | Significant Unobservable Units | Corporate equity, 5 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities $ 2,110  
Estimated number of years 5 years  
Discounted cash flow | Significant Unobservable Units | Corporate equity, 5 years | Discount rate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input 0.108  
Discounted cash flow | Significant Unobservable Units | Corporate equity, 5 years | Termination multiplier    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input | times 0.935  
Discounted cash flow | Significant Unobservable Units | Corporate debt, 2 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities $ 1,034  
Estimated number of years 2 years  
Discounted cash flow | Significant Unobservable Units | Corporate debt, 2 years | Discount rate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input 0.132  
Discounted cash flow | Significant Unobservable Units | Corporate equity, 2 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities   $ 18,193
Estimated number of years   2 years
Discounted cash flow | Significant Unobservable Units | Corporate equity, 2 years | Discount rate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input   0.215
Discounted cash flow | Significant Unobservable Units | Corporate equity, 2 years | Termination multiplier    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input | times   19.5
Discounted cash flow | Significant Unobservable Units | Corporate equity, 9 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities $ 126 $ 127
Estimated number of years 9 years 9 years
Discounted cash flow | Significant Unobservable Units | Corporate equity, 9 years | Discount rate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input 0.588 0.588