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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income $ 65,703 $ 52,942
Other comprehensive income (loss) net of tax:    
Net unrealized gain (loss) on available-for-sale investment securities (2,149) 3,515
Reclassification adjustment of net gain (loss) from sale of available-for-sale securities included in net income 0 (9)
Related tax benefit (expense) 425 (799)
Other comprehensive income (loss) on available-for-sale securities, net of tax (1,724) 2,707
Net unrealized gain (loss) on borrowings cash flow hedges 3,115 (10,499)
Related tax benefit (expense) (697) 2,389
Other comprehensive income (loss) on cash flow hedges of borrowings, net of tax 2,418 (8,110)
Other comprehensive income (loss) net of tax 694 (5,403)
Comprehensive income $ 66,397 $ 47,539