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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income $ 66,130 $ 61,952 $ 195,874 $ 165,471
Other comprehensive income (loss) net of tax:        
Net unrealized gain (loss) during the period on available-for-sale investment securities, net of tax (17,320) 4,672 (23,093) 4,678
Reclassification adjustment of net (gain) loss from sale of available-for-sale securities included in net income, net of tax 0 0 (15) (246)
Net unrealized gain (loss) from investment securities, net of reclassification adjustment (17,320) 4,672 (23,108) 4,432
Net unrealized gain (loss) during the period on borrowings cash flow hedges, net of tax 5,400 (10,727) 3,985 (8,187)
Reclassification adjustment of net (gain) loss included in net income during the period from hedging derivatives, net of tax 4,922 (3,818) 10,260 (10,565)
Net unrealized gain (loss) in cash flow hedging instruments, net of reclassification adjustment 10,322 (14,545) 14,245 (18,752)
Other comprehensive income (loss) (6,998) (9,873) (8,863) (14,320)
Comprehensive income $ 59,132 $ 52,079 $ 187,011 $ 151,151