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INCOME TAXES (Tables)
6 Months Ended
Mar. 31, 2026
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)20262025
Provision at statutory rate$27,182 $26,690 
Tax-exempt income(291)(319)
State income taxes4,921 4,773 
Interim period effective rate adjustment(1,991)(4,375)
Tax credit investments, net - federal(7,161)(3,694)
Research tax credit(1,303)— 
162(m) disallowance865 605 
Other, net(858)(1,509)
Income tax expense$21,364 $22,171 
Effective tax rate16.5%17.4 %