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LOANS & ALLOWANCE FOR CREDIT LOSSES - NARRATIVE (Details)
 3 Months Ended
Sep. 30, 2023
USD ($)
segment
Sep. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
loan
Financing Receivable, Impaired [Line Items]      
Number of loan portfolio segments | segment 6    
Accrued interest receivable on loans held for investments $ 90,800,000   $ 77,900,000
Advances, collateral pledged 5,172,600,000   5,128,400,000
FRBSF and FRB, loans pledged 3,642,600,000   3,689,500,000
Nonaccrual loans 0   0
Interest income recognized on nonaccrual loans 0 $ 0  
Loans past due ninety days or more and still accruing 29,800,000   14,100,000
Mortgage loans in process of foreclosure, amount $ 18,000,000   $ 17,700,000
Nonaccrual      
Financing Receivable, Impaired [Line Items]      
Ratio of nonaccrual loans and leases considered TDRs     1.77%
Period over which borrowers can make timely payments after TDR considered non-performing (in months) 6 months    
Performing      
Financing Receivable, Impaired [Line Items]      
Number or TDRs classified as performing | loan     0