LOANS RECEIVABLE - Schedule of Performance Loan (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	$ 143,305	$ 104,492
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	142,837	102,417
30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	22	0
60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	446	992
90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	1,083
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	134,585	103,610
Commercial loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	134,563	101,535
Commercial loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	22	0
Commercial loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	992
Commercial loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	1,083
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	21,762
Commercial loans | Multi-family | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	21,762
Commercial loans | Multi-family | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0
Commercial loans | Multi-family | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0
Commercial loans | Multi-family | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	32,560	23,449
Commercial loans | Commercial real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	32,560	23,449
Commercial loans | Commercial real estate | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	0
Commercial loans | Commercial real estate | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	0
Commercial loans | Commercial real estate | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	0
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	57,431	61,074
Commercial loans | Commercial & industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	57,409	58,999
Commercial loans | Commercial & industrial | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	22	0
Commercial loans | Commercial & industrial | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	992
Commercial loans | Commercial & industrial | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	1,083
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	22,832	19,087
Commercial loans | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	22,832	19,087
Commercial loans | Construction | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	0
Commercial loans | Construction | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	0
Commercial loans | Construction | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	0
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	8,720	882
Consumer loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	8,274	882
Consumer loans | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	0
Consumer loans | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	446	0
Consumer loans | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	0
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	8,720	882
Consumer loans | Single-family residential | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	8,274	882
Consumer loans | Single-family residential | 30 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	0	0
Consumer loans | Single-family residential | 60 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	446	0
Consumer loans | Single-family residential | 90 Days Delinquent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified in period, amount	$ 0	$ 0