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BORROWINGS, SUBORDINATED NOTES AND DEBENTURES - NARRATIVE (Details)
 1 Months Ended 12 Months Ended 60 Months Ended
Jun. 05, 2025
USD ($)
Sep. 27, 2024
USD ($)
Jul. 15, 2024
USD ($)
Jan. 28, 2019
USD ($)
Dec. 13, 2004
USD ($)
Feb. 28, 2022
USD ($)
Jun. 30, 2025
USD ($)
bank
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2030
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]                        
Borrowings, subordinated notes and debentures             $ 312,671,000 $ 325,679,000        
Repayment of subordinated loans             13,169,000 8,938,000 $ 0      
Gain (loss) on extinguishment             729,000 973,000 $ 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             7,046,500,000 6,976,200,000        
Federal Funds | Borrowings from other banks                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity             $ 250,000,000          
Federal funds lines of credit, number of banks | bank             5          
Secured lines of credit                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity             $ 150,000,000          
Borrowings, subordinated notes and debentures             0 0        
Unsecured line of credit                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity             110,000,000          
Borrowings, subordinated notes and debentures             0 $ 0        
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 $ 1,400,000 $ 9,200,000 $ 2,600,000                  
Borrowings interest rate (as percent)                       4.875%
Basis spread on variable rate           2.27%            
Debt instrument, repurchased face amount 1,500,000 9,500,000 3,000,000                  
Gain (loss) on extinguishment $ 100,000 $ 200,000 $ 400,000                  
Percentage of principal amount redeemed           4.00%            
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)             6.99%          
Basis spread on variable rate             0.26%          
Trust preferred securities         $ 5,000,000              
Borrowings, subordinated notes and debentures             $ 5,200,000          
Basis margin on variable rate             0.024