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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, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]        
Provision at statutory rate     $ 19,271 $ 16,730
Tax-exempt income     (486) (591)
State income taxes     4,135 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 compensation     487 1,019
Other, net     161 23
Income tax expense (benefit) $ 1,133 $ 5,617 $ 4,665 $ 6,297
Effective tax rate     4.97% 7.66%