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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Income Tax Disclosure [Abstract]        
Provision at statutory rate     $ 23,917 $ 20,657
Tax-exempt income     (341) (398)
State income taxes     4,550 4,285
Interim period effective rate adjustment     4,581 (483)
Tax credit investments, net - federal     (11,363) (7,916)
Research tax credit     0 (805)
IRC 162(m) nondeductible compensation     340 576
Other, net     (719) (163)
Income tax expense $ 15,246 $ 9,176 $ 20,965 $ 15,753
Effective tax rate     18.33% 15.83%