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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, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Income Tax Disclosure [Abstract]        
Provision at statutory rate     $ 26,690 $ 27,183
Tax-exempt income     (319) (341)
State income taxes     4,773 5,172
Interim period effective rate adjustment     (4,375) 4,351
Tax credit investments, net - federal     (3,694) (11,363)
IRC 162(m) nondeductible compensation     605 340
Other, net     (1,509) (719)
Income tax expense $ 16,166 $ 16,926 $ 22,171 $ 24,623
Effective tax rate     17.38% 18.95%