INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Federal:
Current	$ 5,657	$ 6,402	$ 3,148
Deferred	12,900	(3,909)	(4,505)
Federal income tax expense	18,557	2,493	(1,357)
State:
Current	4,720	5,938	4,860
Deferred	4,687	2,270	2,158
State tax expense	9,407	8,208	7,018
Income tax expense (benefit)	27,964	10,701	5,661
Deferred tax assets:
Bad debts	10,636	15,946
Deferred compensation	2,652	3,733
Stock based compensation	3,521	3,314
Valuation adjustments	3,047	4,111
General business credits	52,684	49,196
Accrued expenses	1,948	2,780
Lease liability	8,074	9,206
Net unrealized losses on securities available for sale	71,336	0
Other assets	2,662	4,253
Gross deferred tax assets	156,560	92,539
Deferred tax liabilities:
Premises and equipment	(3,148)	(3,328)
Intangibles	(4,099)	(3,032)
Net unrealized gains on securities available for sale	0	(2,471)
Leased assets	(58,592)	(46,355)
Right-of-use assets	(7,758)	(8,877)
Other liabilities	(1,170)	(3,303)
Gross deferred tax liabilities	(74,767)	(67,366)
Net deferred tax assets	81,793	25,173
Amount
Statutory federal income tax expense and rate	38,714	32,854	24,151
Change in tax rate resulting from:
State income taxes net of federal benefits	7,413	6,452	5,444
162(m) disallowance	1,125	686	1,129
Tax exempt income	(743)	(835)	(1,212)
General business credits	(17,589)	(26,945)	(22,284)
Other, net	(956)	(1,511)	(1,567)
Income tax expense (benefit)	$ 27,964	$ 10,701	$ 5,661
Rate
Statutory federal income tax expense and rate (percent)	21.00%	21.00%	21.00%
State income taxes net of federal benefits (percent)	4.00%	4.10%	4.70%
162 (m) disallowance (percent)	0.40%	0.40%	1.00%
Tax exempt income (percent)	(0.40%)	(0.50%)	(1.00%)
General business credits (percent)	(9.50%)	(17.20%)	(19.40%)
Other, net (percent)	(0.30%)	(1.00%)	(1.40%)
Total income tax expense (percent)	15.20%	6.80%	4.90%
Gross deferred tax on state net operating loss carryforwards	$ 2,900	$ 2,700
Operating loss carryforwards reserved	2,900	2,700
Tax credit, investment, amount	16,800	26,500	$ 20,500
Reconciliation for liabilities [Abstract]
Balance at beginning of fiscal year	777	1,091
Reductions for tax positions related to prior years	(132)	(314)
Balance at end of fiscal year	645	$ 777	$ 1,091
Unrecognized tax benefits that, if recognized, would impact the effective rate	699
Accrued interest related to unrecognized tax benefits	$ 145