FEE AND COMMISSION INCOME AND EXPENSE - Narrative (Details) $ in Millions  | 
12 Months Ended | 
|---|---|
| 
 Mar. 31, 2025  
USD ($) 
 | |
| Receivables [Abstract] | |
| Customer loyalty program, cash back incentive | $ 24.2 | 
| X | ||||||||||
- Definition Customer Loyalty Program, Cash Back Incentive, Amount Netted During Period No definition available. 
  | 
| X | ||||||||||
- References No definition available. 
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