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BORROWINGS, SUBORDINATED NOTES AND DEBENTURES - NARRATIVE (Details)
1 Months Ended 12 Months Ended
Jan. 28, 2019
USD ($)
Dec. 13, 2004
USD ($)
Feb. 28, 2022
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2022
USD ($)
bank
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]                
Borrowings, subordinated notes and debentures         $ 445,244,000 $ 221,358,000    
Repayment of subordinated loans         0 51,000,000 $ 0  
Borrowings from other banks                
Debt Instrument [Line Items]                
Maximum borrowing capacity         $ 175,000,000      
Federal funds lines of credit, number of banks | bank         2      
Credit line amount outstanding         $ 0 0    
Federal reserve bank advances                
Debt Instrument [Line Items]                
Short-term borrowings outstanding         0 0    
Maximum borrowing capacity         2,823,500,000 $ 2,091,300,000    
Secured lines of credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity         150,000,000      
Borrowings, subordinated notes and debentures         $ 58,400,000      
Weighted average interest rate of borrowings (as percent)         2.99%      
Unsecured line of credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity         $ 75,000,000      
Borrowings, subordinated notes and debentures         53,100,000      
Subordinated loans                
Debt Instrument [Line Items]                
Borrowings, subordinated notes and debentures         $ 7,400,000      
Debt issued principal amount $ 7,500,000              
Subordinated notes maturity (in months) 15 months              
Effective rate (as percent) 6.25%              
Repayment of subordinated loans               $ 100,000
Subordinated notes                
Debt Instrument [Line Items]                
Debt issued principal amount     $ 150,000,000 $ 175,000,000        
Effective rate (as percent)     4.00% 4.875%        
Basis spread on variable rate     227.00%          
Percentage of principal amount redeemed     4.00%          
Subordinated notes | Secured Overnight Financing Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate       4.76%        
Junior subordinated debentures                
Debt Instrument [Line Items]                
Effective rate (as percent)         3.90%      
Basis spread on variable rate         2.40%      
Trust preferred securities   $ 5,000,000            
Borrowings, subordinated notes and debentures         $ 5,200,000      
Junior subordinated debentures | LIBOR                
Debt Instrument [Line Items]                
Description of variable rate basis         three-month LIBOR