PARENT COMPANY CONDENSED FINANCIAL INFORMATION - (Balance Sheets) (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 20, 2018	Oct. 15, 2014
Assets:
Cash and due from banks	$ 14,191	$ 12,807
Other assets	21,550	30,126			$ 4,200
Total Assets	1,720,506	1,764,625	$ 1,222,579
Liabilities and Equity:
Subordinated note				$ 20,000
Stockholders' equity	180,377	157,272
Total Liabilities and Equity	1,720,506	1,764,625
Reportable Legal Entities [Member] | Parent Company [Member]
Assets:
Cash and due from banks	6,870	4,762
Other assets	755	988
Investment in subsidiaries	193,926	171,871
Total Assets	201,551	177,621
Liabilities and Equity:
Subordinated note	19,865	19,797
Accrued expenses	1,309	552
Stockholders' equity	180,377	157,272
Total Liabilities and Equity	$ 201,551	$ 177,621