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INCOME TAXES (Tables)
6 Months Ended
Mar. 31, 2022
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)20222021
Provision at statutory rate$27,899 $19,271 
Tax-exempt income(362)(486)
State income taxes5,543 4,135 
Interim period effective rate adjustment(3,870)(3,116)
Tax credit investments, net - federal(5,978)(15,464)
Research tax credit(355)(323)
IRC 162(m) nondeductible compensation505 487 
Other, net(1,104)161 
Income tax expense$22,278 $4,665 
Effective tax rate16.66 %4.97 %