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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net income $ 50,281 $ 38,951
Other comprehensive income (loss) net of tax:    
Net unrealized gain (loss) during the period on available-for-sale investment securities, net of tax (12,934) 8,991
Reclassification adjustment of net (gain) loss from sale of available-for-sale securities included in net income, net of tax 62 0
Net unrealized gain (loss) from investment securities, net of reclassification adjustment (12,872) 8,991
Net unrealized gain (loss) during the period on borrowings cash flow hedges, net of tax 4,963 15,491
Reclassification adjustment of net (gain) loss included in net income during the period from hedging derivatives, net of tax 0 0
Net unrealized gain (loss) in cash flow hedging instruments, net of reclassification adjustment 4,963 15,491
Other comprehensive income (loss) (7,909) 24,482
Comprehensive income $ 42,372 $ 63,433