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v3.23.2

LOANS & ALLOWANCE FOR CREDIT LOSSES - NARRATIVE (Details) | 12 Months Ended
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Jun. 30, 2023 USD ($) segment | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |
Number of loan portfolio segments | segment | 6 |  |
Accrued interest receivable | $ 77,900,000 | $ 50,100,000 |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets |
Advances, collateral pledged | $ 5,128,400,000 | $ 3,823,100,000 |
FRBSF and FRB, loans pledged | 3,689,500,000 | 3,861,600,000 |
Purchased loans serviced by others, amount | $ 32,500,000 | $ 37,300,000 |
Purchased loans serviced by others, percent | 0.20% | 0.26% |
Nonaccrual loans, without an allowance | $ 0 | $ 0 |
Interest recognized on performing loans temporarily modified as TDRs | 0 | 0 | $ 0
Interest income recognized | 0 | 0 | 0
Loans past due ninety days or more and still accruing | 14,000,000 | 0 |
Mortgage loans in process of foreclosure, amount | $ 22,200,000 | $ 20,700,000 |
Nonaccrual |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Ratio of nonaccrual loans and leases considered TDRs | 1.77% | 1.18% |
Performing |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Amount in performing TDRs | $ 0 | $ 0 | $ 0
Single Family - Mortgage & Warehouse |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Interest only loans | 1,331,200,000 | 1,197,400,000 |
Option adjustable-rate mortgage loans | $ 8,900,000 | $ 7,000,000 |
Single Family - Mortgage & Warehouse | California | Financing Receivable | Geographic concentration risk |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Concentration risk percentage | 71.40% | 70.60% |
Single Family - Mortgage & Warehouse | New York | Financing Receivable | Geographic concentration risk |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Concentration risk percentage | 11.00% | 13.00% |
Multifamily Loan Category | California | Financing Receivable | Geographic concentration risk |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Concentration risk percentage | 69.10% | 68.30% |
Multifamily Loan Category | New York | Financing Receivable | Geographic concentration risk |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Concentration risk percentage | 19.70% | 18.80% |
Commercial Real Estate | California | Financing Receivable | Geographic concentration risk |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Concentration risk percentage |  | 11.90% |
Commercial Real Estate | New York | Financing Receivable | Geographic concentration risk |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Concentration risk percentage | 37.50% | 40.50% |
Commercial Real Estate | FLORIDA | Financing Receivable | Geographic concentration risk |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Concentration risk percentage | 10.50% |  |
Fixed Interest Rate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Percent of loans by interest rate type | 7.00% | 9.00% |
Adjustable Interest Rate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Percent of loans by interest rate type | 93.00% | 91.00% |

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