FAIR VALUE - Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Carrying Amount
Financial Assets
Cash and cash equivalents	$ 204,355	$ 149,947
Securities held to maturity	4,263	4,414
Loans, net	1,772,486	1,610,687
Accrued interest receivable	10,200	8,546
Financial Liabilities
Time deposits	430,852	339,073
Demand and other deposits	1,276,422	1,189,033
Borrowings	136,962	101,752
Subordinated debentures	24,594	24,568
Accrued interest payable	1,391	915
As Adjusted
Financial Assets
Cash and cash equivalents	204,355	149,947
Securities held to maturity	4,011	4,095
Loans, net	1,727,121	1,564,991
Accrued interest receivable	10,200	8,546
Financial Liabilities
Time deposits	423,492	328,964
Demand and other deposits	1,276,422	1,189,033
Borrowings	136,255	99,597
Subordinated debentures	25,617	24,199
Accrued interest payable	1,391	915
As Adjusted | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets
Cash and cash equivalents	204,355	149,947
Securities held to maturity	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Financial Liabilities
Time deposits	0	0
Demand and other deposits	1,276,422	1,189,033
Borrowings	0	0
Subordinated debentures	0	0
Accrued interest payable	0	1
As Adjusted | Significant Other Observable Inputs (Level 2)
Financial Assets
Cash and cash equivalents	0	0
Securities held to maturity	4,011	4,095
Loans, net	0	0
Accrued interest receivable	492	219
Financial Liabilities
Time deposits	423,492	328,964
Demand and other deposits	0	0
Borrowings	136,255	99,597
Subordinated debentures	25,617	24,199
Accrued interest payable	1,391	914
As Adjusted | Significant Unobservable Inputs (Level 3)
Financial Assets
Cash and cash equivalents	0	0
Securities held to maturity	0	0
Loans, net	1,727,121	1,564,991
Accrued interest receivable	9,708	8,327
Financial Liabilities
Time deposits	0	0
Demand and other deposits	0	0
Borrowings	0	0
Subordinated debentures	0	0
Accrued interest payable	$ 0	$ 0