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BORROWINGS, SUBORDINATED NOTES AND DEBENTURES - NARRATIVE (Details)
 1 Months Ended 12 Months Ended 60 Months Ended
Apr. 06, 2024
USD ($)
Mar. 06, 2024
USD ($)
Jan. 28, 2019
USD ($)
Dec. 13, 2004
USD ($)
Feb. 28, 2022
USD ($)
Jun. 30, 2024
USD ($)
bank
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2030
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]                      
Borrowings, subordinated notes and debentures           $ 325,679,000 $ 361,779,000        
Repayment of subordinated loans           8,938,000 0 $ 0      
Gain(loss) on extinguishment           973,000 0 $ 0      
Borrowings from other banks                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity           0 0        
Federal Reserve Bank Advances                      
Debt Instrument [Line Items]                      
Short-term borrowings outstanding           0 0        
Maximum borrowing capacity           6,976,200,000 2,747,100,000        
Federal funds | Borrowings from other banks                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity           $ 275,000,000          
Federal funds lines of credit, number of banks | bank           6          
Secured lines of credit                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity           $ 150,000,000          
Borrowings, subordinated notes and debentures           0 11,500,000        
Unsecured line of credit                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity           110,000,000          
Borrowings, subordinated notes and debentures           0 $ 15,700,000        
Subordinated loans                      
Debt Instrument [Line Items]                      
Borrowings, subordinated notes and debentures           $ 7,400,000          
Subordinated notes     $ 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]                      
Subordinated notes         $ 150,000,000           $ 175,000,000
Repayment of subordinated loans $ 4,800,000 $ 4,200,000                  
Borrowings interest rate (as percent)                     4.875%
Basis spread on variable rate         2.27%            
Percentage of principal amount redeemed         4.00%            
Debt instrument, repurchased face amount 5,000,000 5,000,000                  
Gain(loss) on extinguishment $ 200,000 $ 700,000                  
Subordinated notes | Forecast                      
Debt Instrument [Line Items]                      
Basis spread on variable rate                   4.76%  
Junior subordinated debentures                      
Debt Instrument [Line Items]                      
Effective rate (as percent)           7.99%          
Basis spread on variable rate           0.26161%          
Trust preferred securities       $ 5,000,000              
Borrowings, subordinated notes and debentures           $ 5,200,000