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INCOME TAXES (Tables)
9 Months Ended
Jun. 30, 2023
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The table below compares the income tax expense components for the periods presented.
Nine Months Ended June 30,
(Dollars in thousands)20232022
Provision at statutory rate$30,808 $34,063 
Tax-exempt income(600)(541)
State income taxes6,109 6,728 
Interim period effective rate adjustment(3,065)(2,849)
Tax credit investments, net - federal(13,669)(6,994)
Research tax credit(805)(355)
IRC 162(m) nondeductible compensation928 801 
Other, net(710)(1,617)
Income tax expense$18,996 $29,236 
Effective tax rate12.80 %17.77 %