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INCOME TAXES (Tables)
6 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The table below compares the income tax expense components for the periods presented.
Six Months Ended March 31,
(Dollars in thousands)20242023
Provision at statutory rate$23,917 $20,657 
Tax-exempt income(341)(398)
State income taxes4,550 4,285 
Interim period effective rate adjustment4,581 (483)
Tax credit investments, net - federal(11,363)(7,916)
Research tax credit— (805)
IRC 162(m) nondeductible compensation340 576 
Other, net(719)(163)
Income tax expense$20,965 $15,753 
Effective tax rate18.33 %15.83 %