ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Significant amounts reclassified out of accumulated other comprehensive income [Abstract]
Realized gains on securities available-for-sale	$ 105	$ 240	$ 105	$ 240
Tax effect	(1,699)	(514)	(3,642)	(918)
Accumulated Other Comprehensive Income [Member]
Significant amounts reclassified out of accumulated other comprehensive income [Abstract]
Net of tax	81	191	81	191
Unrealized Gains and Losses on Available-for-Sale Debt Securities
Significant amounts reclassified out of accumulated other comprehensive income [Abstract]
Net of tax	81	191	81	191
Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Debt Securities
Significant amounts reclassified out of accumulated other comprehensive income [Abstract]
Realized gains on securities available-for-sale	105	240	105	240
Tax effect	(24)	(49)	(24)	(49)
Net of tax	$ 81	$ 191	$ 81	$ 191