Parent Company - Condensed Statement of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
INCOME
Interest income	$ 61,554	$ 59,771
EXPENSES
Professional fees	4,760	3,512
Other	2,911	3,029
Total noninterest expense	45,690	43,277
Income tax benefit	4,494	4,934
NET INCOME	18,576	20,070
COMPREHENSIVE INCOME	11,977	16,494
Parent Company [Member]
INCOME
Interest income	718	334
Unrealized gain on equity securities	4	(4)
Dividends	6,000	10,000
Total income	6,722	10,330
EXPENSES
Professional fees	657	537
Other	30	30
Total noninterest expense	687	567
Income before income tax benefit	6,035	9,763
Income tax benefit	7	(52)
Income before equity in undistributed net earnings of subsidiary	6,028	9,815
Equity in undistributed net earnings of subsidiary	12,548	10,255
NET INCOME	18,576	20,070
COMPREHENSIVE INCOME	$ 11,977	$ 16,494