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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Provision at statutory rate $ 15,876 $ 6,630
Tax-exempt income (172) (249)
State income taxes 3,087 1,488
Interim period effective rate adjustment 1,827 5,467
Tax credit investments, net - federal (5,670) (10,123)
Research tax credit 0 (323)
IRC 162(m) nondeductible compensation 263 334
Other, net (935) 309
Income tax expense $ 14,276 $ 3,533
Effective tax rate 18.89% 10.77%