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SECURITIES - NARRATIVE (Details)
$ in Thousands
 12 Months Ended
Jun. 30, 2023
USD ($)
security
Jun. 30, 2022
USD ($)
security
Jun. 30, 2021
USD ($)
Marketable Securities [Line Items]      
Available-for-sale securities, credit losses $ 0 $ 0 $ 0
Available-for-sale, debt securities, allowance 0    
Available-for-sale $ 232,350 $ 262,518  
Number of securities in a continuous loss position for a period of more than 12 months | security 37 14  
Number of securities in a continuous loss position for a period of less than 12 months | security 17 25  
Number of trading securities sold | security 0 0  
Investment resolution, no realized gain or loss     $ 70,800
Asset Pledged as Collateral      
Marketable Securities [Line Items]      
Debt securities available-for-sale and held-to-maturity pledged to secure borrowings $ 900 $ 1,200  
Securities – Non-agency MBS      
Marketable Securities [Line Items]      
Available-for-sale $ 205,005 $ 186,814  
RMBS, Super Senior Securities      
Marketable Securities [Line Items]      
Available-for-sale, number of securities | security 17