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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]    
Net income $ 38,951 $ 67,866
Other comprehensive income (loss) net of tax:    
Net unrealized gain (loss) during the period on available-for-sale investment securities, net of tax of $(2,686) and $425 8,991 (1,724)
Other comprehensive income (loss) on available-for-sale securities, net of tax 8,991 (1,724)
Net unrealized gain (loss) during the period on borrowings cash flow hedges, net of tax of $(4,627) and $(697) 15,491 2,418
Other comprehensive income (loss) on borrowing cash flow hedges, net of tax 15,491 2,418
Other comprehensive income (loss) 24,482 694
Comprehensive income $ 63,433 $ 68,560