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INCOME TAXES (Tables)
6 Months Ended
Mar. 31, 2021
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)20212020
Provision at statutory rate$19,271 $16,730 
Tax-exempt income(486)(591)
State income taxes4,135 3,682 
Interim period effective rate adjustment(3,116)(3,321)
Tax credit investments, net - federal(15,464)(9,536)
Research tax credit(323)(1,709)
IRC 162(m) nondeductible compensation487 1,019 
Other, net161 23 
Income tax expense (benefit)$4,665 $6,297 
Effective tax rate4.97 %7.66 %