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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)  (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]        
Net unrealized gain (loss) during the period on available-for-sale debt securities, tax $ (5,795) $ 514 $ (2) $ (8,780)
Reclassification adjustment of net (gain) loss from sale of available-for-sale securities included in net income, tax 0 (21) 76 (40)
Net unrealized gain (loss) during the period on borrowings cash flow hedges, tax 4,312 (4,160) (785) 5,121
Reclassification adjustment of net (gain) loss included in net income during the period from hedging derivatives, tax $ 2,085 $ 0 $ 2,084 $ 0