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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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