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SECURITIES - NARRATIVE (Details)
 3 Months Ended 9 Months Ended
Mar. 31, 2022
USD ($)
security
Mar. 31, 2022
USD ($)
security
Mar. 31, 2021
security
Jun. 30, 2021
USD ($)
security
Debt Securities, Available-for-sale [Line Items]        
Available-for-sale $ 229,510,000 $ 229,510,000   $ 187,335,000
Number of available-for-sale securities in continuous loss position for a period of more than 12 months | security 12 12   7
Number of available-for-sale securities in continuous loss position for a period of less than 12 months | security 18 18   7
Number of available-for-sale securities sold | security   0 0  
Asset Pledged as Collateral        
Debt Securities, Available-for-sale [Line Items]        
Available-for-sale securities pledged as collateral $ 1,200,000 $ 1,200,000   $ 1,400,000
Non-agency        
Debt Securities, Available-for-sale [Line Items]        
Available-for-sale $ 151,479,000 $ 151,479,000   $ 67,615,000
Number of non-agency RMBS | security 1 1    
Carrying amount of securities with cumulative credit losses $ 2,400,000 $ 2,400,000    
Cumulative credit losses 800,000 $ 800,000    
Credit losses recognized in earnings $ 0      
RMBS, Super Senior Securities        
Debt Securities, Available-for-sale [Line Items]        
Available-for-sale, number of securities | security 16 16