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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 53,854	$ 51,394	$ 157,894	$ 152,335
Other comprehensive income (loss) net of tax:
Net unrealized gain (loss) on available-for-sale investment securities	14,577	(4,851)	31,677	(18,282)
Reclassification adjustment of net gain (loss) from sale of available-for-sale securities included in net income	0	0	(9)	0
Related tax benefit (expense)	(3,316)	1,104	(7,204)	5,506
Other comprehensive income (loss) on available-for-sale securities, net of tax	11,261	(3,747)	24,464	(12,776)
Net unrealized gain (loss) on cash flow hedges of borrowings	(10,043)	3,865	(26,692)	20,887
Related tax benefit (expense)	2,285	(879)	6,071	(4,989)
Other comprehensive income (loss) on cash flow hedges of borrowings, net of tax	(7,758)	2,986	(20,621)	15,898
Other comprehensive income (loss) net of tax	3,503	(761)	3,843	3,122
Comprehensive income	$ 57,357	$ 50,633	$ 161,737	$ 155,457

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