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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]      
Net income $ 226,068 $ 200,041 $ 257,426
Other comprehensive income (loss), net of tax:      
Net unrealized gain (loss) during the period on available-for-sale debt securities, net of tax of $(8,320), $(17,782) and $2,493 26,933 61,225 (9,360)
Reclassification adjustment of net (gain) loss included in net income during the period from sale of available-for-sale securities, net of tax of $76, $(81) and $(9) (246) 261 26
Net unrealized gain (loss) from investment securities, net of reclassification adjustment 26,687 61,486 (9,334)
Net unrealized gain (loss) during the period on borrowing cash flow hedges, net of tax of $4,257, $14,546 and $(654) (13,783) (52,556) 3,774
Reclassification adjustment of net (gain) loss included in net income during the period from hedging derivatives, net of tax of $3,647, $0 and $0 (11,805) 0 0
Net unrealized gain (loss) in cash flow hedging instruments, net of reclassification adjustment (25,588) (52,556) 3,774
Other comprehensive income (loss) 1,099 8,930 (5,560)
Comprehensive income $ 227,167 $ 208,971 $ 251,866