PREMISES, FURNITURE, AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Property, Plant and Equipment [Line Items]
Premises, furniture, and equipment, gross	$ 86,862	$ 84,997
Less: accumulated depreciation and amortization	(47,807)	(45,837)
Net book value	39,055	39,160
Depreciation expense of premises, furniture, and equipment	10,200	11,100	$ 11,300
Land
Property, Plant and Equipment [Line Items]
Premises, furniture, and equipment, gross	1,354	1,354
Buildings
Property, Plant and Equipment [Line Items]
Premises, furniture, and equipment, gross	21,685	21,331
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Premises, furniture, and equipment, gross	$ 63,823	$ 62,312