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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]        
Net income $ 51,098 $ 49,271 $ 104,040 $ 100,941
Other comprehensive income (loss) net of tax:        
Net unrealized gain (loss) on available-for-sale investment securities 13,585 (11,467) 17,100 (13,431)
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) (3,091) 3,681 (3,889) 4,403
Other comprehensive income (loss) on available-for-sale securities, net of tax 10,494 (7,786) 13,202 (9,028)
Net unrealized gain (loss) on cash flow hedges of borrowings (6,150) 10,332 (16,650) 17,022
Related tax benefit (expense) 1,399 (1,651) 3,788 (4,110)
Other comprehensive income (loss) on cash flow hedges of borrowings, net of tax (4,751) 8,681 (12,862) 12,912
Other comprehensive income (loss) net of tax 5,743 895 340 3,884
Comprehensive income $ 56,841 $ 50,166 $ 104,380 $ 104,825