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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]      
Related tax benefit (expense) for net unrealized gain (loss) on available-for-sale debt securities $ 36,908 $ (2,020) $ (6,220)
Related tax benefit (expense) for reclassification adjustment of net (gain) loss included in net income during the period from sale of available-for-sale securities (23) (3) 3,456
Related tax benefit (expense) for net unrealized gain (loss) on borrowing cash flow hedges (31,805) (17,003) 2,204
Related tax benefit (expense) for reclassification adjustment of net (gain) loss included in net income during the period from hedging derivatives $ 0 $ 3,245 $ 0