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NET INTEREST INCOME/EXPENSE
 3 Months Ended
Jun. 30, 2026
Investments, Debt and Equity Securities [Abstract]  
NET INTEREST INCOME/EXPENSE NET INTEREST INCOME/EXPENSE
Net interest income/expense for the three months ended June 30, 2026 and June 30, 2025 includes:
Three months ended June 30, 2026
Three months ended June 30, 2025
Interest income:
Interest income on margin loans to customers$108,190 $60,289 
Interest income on loans to customers81,481 61,694 
Interest income on trading securities59,810 52,576 
Interest income on securities available-for-sale20,034 13,383 
Interest income on held-to-maturity securities17,080 5,173 
Interest income on reverse repurchase agreements and amounts due from banks7,585 5,456 
Other interest income926 — 
Total interest income$295,106 $198,571 
Interest expense:
Interest expense on customer accounts and deposits$86,917 $39,332 
Interest expense on securities repurchase agreement obligations48,176 45,461 
Interest expense on debt securities issued33,234 13,751 
Interest expense on margin lending payable6,889 13,374 
Interest expense on loans received2,061 510 
Other interest expense286 982 
Total interest expense$177,563 $113,410 
Net interest income$117,543 $85,161