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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Commitment and Contingencies [Line Items]    
Weighted average remaining lease term 9 years 1 month 6 days  
Weighted average discount rate 3.94%  
Operating lease payments $ 10,758 $ 9,627
Operating lease liability, statement of financial position [Extensible Enumeration] Accrued expenses and other liabilities Accrued expenses and other liabilities
Right-of-use assets obtained in exchange for lease liabilities $ 19,280 $ 12,890
Operating lease right-of-use asset, statement of financial position [Extensible Enumeration] Other assets Other assets
Right-of-use asset obtained in merger   $ 11,478
Rental expense $ 12,894 11,025
Loans receivable, net 20,088,618 20,916,354
Investment, proportional amortization method, elected, amount $ 157,249 $ 112,342
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Investment program, proportional amortization method, elected, commitment $ 73,123 $ 41,702
Federal Home Loan Bank Advances    
Commitment and Contingencies [Line Items]    
Loans receivable, net 62,606 902,606
Unfunded commitments    
Commitment and Contingencies [Line Items]    
Loans receivable, net 2,841,596 $ 2,928,697
Reserve for unfunded commitments $ 21,500