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INCOME TAXES (Tables)
6 Months Ended
Mar. 31, 2020
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)20202019
Provision at statutory rate$16,730  $9,541  
Tax-exempt income(591) (1,824) 
State income taxes3,682  2,143  
Interim period effective rate adjustment(3,321) (3,968) 
Tax credit investments, net - federal(9,536) (9,568) 
Research tax credit(1,709) —  
IRC 162(m) nondeductible compensation1,019  1,561  
Other, net23  29  
Income tax expense (benefit)$6,297  $(2,086) 
Effective tax rate7.66 %(4.40)%