Quarterly report [Sections 13 or 15(d)]

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

v3.25.3
INVESTMENT SECURITIES - Schedule of valuation techniques and significant level 3 inputs used in the valuation (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
times
Mar. 31, 2025
USD ($)
times
Significant Unobservable Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities $ 22,454 $ 18,320
Discounted cash flow | Corporate equity, 3 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated number of years 3 years  
Discounted cash flow | Corporate equity, 3 years | Discount rate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input 0.134  
Discounted cash flow | Corporate equity, 3 years | Termination multiplier    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input | times 15.1  
Discounted cash flow | Corporate equity, 5 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated number of years 5 years  
Discounted cash flow | Corporate equity, 5 years | Discount rate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input 0.114  
Discounted cash flow | Corporate equity, 5 years | Termination multiplier    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input | times 0.95  
Discounted cash flow | Corporate debt, 2 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated number of years 2 years  
Discounted cash flow | Corporate debt, 2 years | Discount rate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input 0.132  
Discounted cash flow | Corporate equity, 2 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated number of years   2 years
Discounted cash flow | Corporate equity, 2 years | Discount rate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input   0.215
Discounted cash flow | 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 | Corporate equity, 9 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated number of years 9 years 9 years
Discounted cash flow | Corporate equity, 9 years | Discount rate    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Measurement input 0.588 0.588
Discounted cash flow | Significant Unobservable Units | Corporate equity, 3 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities $ 19,291  
Discounted cash flow | Significant Unobservable Units | Corporate equity, 5 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities 1,974  
Discounted cash flow | Significant Unobservable Units | Corporate debt, 2 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities 1,073  
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
Discounted cash flow | Significant Unobservable Units | Corporate equity, 9 years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Investment securities $ 116 $ 127