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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Income Tax Disclosure [Abstract]        
Provision at statutory rate     $ 16,730 $ 9,541
Tax-exempt income     (591) (1,824)
State income taxes     3,682 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) 0
IRC 162(m) nondeductible compensation     1,019 1,561
Other, net     23 29
Income tax expense (benefit) $ 5,617 $ (395) $ 6,297 $ (2,086)
Effective tax rate     7.66% (4.40%)