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SECURITIES - NARRATIVE (Details)
 3 Months Ended 9 Months Ended
Mar. 31, 2023
USD ($)
security
Mar. 31, 2023
USD ($)
security
Jun. 30, 2022
USD ($)
security
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale $ 279,612,000 $ 279,612,000 $ 262,518,000
Number of available-for-sale securities in continuous loss position for a period of more than 12 months | security 29 29 14
Number of available-for-sale securities in continuous loss position for a period of less than 12 months | security 25 25 25
Carrying amount of securities with cumulative credit losses $ 1,500,000 $ 1,500,000  
Cumulative credit losses 800,000 $ 800,000  
Number of available-for-sale securities sold | security   0  
Asset Pledged as Collateral      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale securities pledged as collateral 1,100,000 $ 1,100,000 $ 1,200,000
Non-agency      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale $ 206,300,000 $ 206,300,000 $ 186,814,000
Number of non-agency RMBS | security 1 1  
Credit losses recognized in earnings $ 0    
RMBS, Super Senior Securities      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale, number of securities | security 18 18