CREDIT QUALITY ASSESSMENT - Performance of Modified Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 61,158	$ 59,832
Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	53,500	57,570
30-89 days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	4,624	2,262
90+ days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	3,034	0
Commercial real estate: | Commercial investor real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	35,924	49,782
Commercial real estate: | Commercial investor real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	29,458	48,548
Commercial real estate: | Commercial investor real estate | 30-89 days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	4,143	1,234
Commercial real estate: | Commercial investor real estate | 90+ days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	2,323	0
Commercial real estate: | Commercial owner-occupied real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	5,974	3,573
Commercial real estate: | Commercial owner-occupied real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	5,974	3,234
Commercial real estate: | Commercial owner-occupied real estate | 30-89 days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	339
Commercial real estate: | Commercial owner-occupied real estate | 90+ days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Commercial real estate: | Commercial AD&C
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1,795	1,039
Commercial real estate: | Commercial AD&C | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1,673	350
Commercial real estate: | Commercial AD&C | 30-89 days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	689
Commercial real estate: | Commercial AD&C | 90+ days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	122	0
Commercial business
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	16,926	5,438
Commercial business | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	16,395	5,438
Commercial business | 30-89 days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	481	0
Commercial business | 90+ days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	50	0
All Other loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	539	0
All Other loans | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
All Other loans | 30-89 days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
All Other loans | 90+ days past due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 539	$ 0