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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Statement of Comprehensive Income [Abstract]        
Net income $ 15,888 $ 65,934 $ 74,341 $ 145,443
Other comprehensive income (loss) net of tax:        
Net unrealized gain (loss) during the period on available-for-sale investment securities, net of tax of $514 and $(5,705) (1,730) 18,993 29,546 13,471
Reclassification adjustment of net (gain) loss from sale of available-for-sale securities included in net income, net of tax of $(21) and $0 69 0 132 0
Net unrealized gain (loss) from investment securities, net of reclassification adjustment (1,661) 18,993 29,678 13,471
Net unrealized gain (loss) during the period on borrowings cash flow hedges, net of tax of $(4,160) and $5,075 6,582 (16,897) (24,664) (22,130)
Net unrealized gain (loss) in cash flow hedging instruments, net of reclassification adjustment 6,582 (16,897) (24,664) (22,130)
Other comprehensive income (loss) 4,921 2,096 5,014 (8,659)
Comprehensive income $ 20,809 $ 68,030 $ 79,355 $ 136,784