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LOANS & ALLOWANCE FOR CREDIT LOSSES - NARRATIVE (Details)
 3 Months Ended 9 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
segment
Mar. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Receivables [Abstract]          
Number of loan portfolio segments | segment     5    
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other assets   Other assets   Other assets
Accrued interest receivable on loans held for investments $ 113,600,000   $ 113,600,000   $ 119,800,000
Advances, collateral pledged 4,272,600,000   4,272,600,000   4,942,800,000
FRBSF and FRB, loans pledged 8,771,800,000   8,771,800,000   8,197,200,000
Nonaccrual loans 0   0   0
Interest income recognized on nonaccrual loans 0 $ 0 0 $ 0  
Loans past due ninety days or more and still accruing 2,300,000   2,300,000   20,200,000
Mortgage loans in process of foreclosure, amount $ 34,800,000   $ 34,800,000   $ 20,100,000