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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]    
Net income $ 58,453 $ 79,509
Other comprehensive income (loss) net of tax:    
Net unrealized gain (loss) during the period on available-for-sale investment securities, net of tax of $(9,294) and $1,659 31,276 (5,521)
Reclassification adjustment of net (gain) loss from sale of available-for-sale securities included in net income, net of tax of $(19) and $0 63 0
Net unrealized gain (loss) from investment securities, net of reclassification adjustment 31,339 (5,521)
Net unrealized gain (loss) during the period on borrowings cash flow hedges, net of tax of $9,281 and $1,572 (31,246) (5,234)
Net unrealized gain (loss) in cash flow hedging instruments, net of reclassification adjustment (31,246) (5,234)
Other comprehensive income (loss) 93 (10,755)
Comprehensive income $ 58,546 $ 68,754