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LOANS & ALLOWANCE FOR CREDIT LOSSES-LOANS - NARRATIVE (Details)
12 Months Ended
Jun. 30, 2022
USD ($)
loan
segment
Jun. 30, 2021
USD ($)
loan
Jun. 30, 2020
USD ($)
Financing Receivable, Impaired [Line Items]      
Number of loan portfolio segments | segment 6    
Number of new related party loans | loan 1 4  
Amount received from new related party loans $ 1,400,000 $ 10,000,000  
Principal payments received on related party loans 3,000,000 7,000,000  
Ending balance of related party loans 25,600,000 23,800,000  
Interest earned on related party loans 100,000 100,000  
Purchased loans serviced by others, amount $ 37,300,000 $ 44,700,000  
Purchased loans serviced by others, percent 0.26% 0.39%  
Interest recognized on performing loans temporarily modified as TDRs $ 0 $ 0 $ 0
Average balances of impaired loans and leases 136,400,000 142,000,000 60,600,000
Interest income recognized 0 $ 0 0
Loans granted forbearance or deferral $ 0    
Nonaccrual      
Financing Receivable, Impaired [Line Items]      
Ratio of nonaccrual loans and leases considered TDRs 1.18% 0.55%  
Period over which borrowers can make timely payments after TDR considered non-performing (in months) 6 months    
Performing      
Financing Receivable, Impaired [Line Items]      
Amount in performing TDRs $ 0 $ 0 $ 0
Number of TDRs classified as performing loans | loan 0 0  
Single Family - Mortgage & Warehouse      
Financing Receivable, Impaired [Line Items]      
Interest only loans $ 1,197,400,000 $ 1,074,300,000  
Option adjustable-rate mortgage loans $ 7,000,000 $ 900,000  
Single Family - Mortgage & Warehouse | Financing Receivable | Geographic concentration risk | California      
Financing Receivable, Impaired [Line Items]      
Concentration risk percentage 70.60% 72.40%  
Single Family - Mortgage & Warehouse | Financing Receivable | Geographic concentration risk | New York      
Financing Receivable, Impaired [Line Items]      
Concentration risk percentage 13.00% 12.80%  
Single Family - Mortgage & Warehouse | Nonaccrual      
Financing Receivable, Impaired [Line Items]      
Ratio of nonaccrual loans that are single family mortgage 56.20%    
Multifamily Loan Category | Financing Receivable | Geographic concentration risk | California      
Financing Receivable, Impaired [Line Items]      
Concentration risk percentage 68.30% 72.50%  
Multifamily Loan Category | Financing Receivable | Geographic concentration risk | New York      
Financing Receivable, Impaired [Line Items]      
Concentration risk percentage 18.80% 14.50%  
Commercial Real Estate | Financing Receivable | Geographic concentration risk | California      
Financing Receivable, Impaired [Line Items]      
Concentration risk percentage 11.90% 12.40%  
Commercial Real Estate | Financing Receivable | Geographic concentration risk | New York      
Financing Receivable, Impaired [Line Items]      
Concentration risk percentage 40.50% 54.20%  
Fixed Interest Rate      
Financing Receivable, Impaired [Line Items]      
Percent of loans by interest rate type 9.40% 14.90%  
Adjustable Interest Rate      
Financing Receivable, Impaired [Line Items]      
Percent of loans by interest rate type 90.60% 85.10%