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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]        
Net income $ 49,271 $ 42,070 $ 100,941 $ 83,316
Other comprehensive income (loss) net of tax:        
Net unrealized gain (loss) on available-for-sale investment securities (11,467) 5,685 (13,431) (11,394)
Reclassification adjustment of net gain (loss) from sale of available-for-sale securities included in net income 0 0 0 968
Related tax benefit (expense) 3,681 (2,089) 4,403 3,832
Other comprehensive income (loss) for available for sale securities, net of tax (7,786) 3,596 (9,028) (6,594)
Net unrealized gain (loss) on cash flow hedges of borrowings 10,332 2,395 17,022 31,666
Related tax benefit (expense) (1,651) (880) (4,110) (11,637)
Other comprehensive income (loss) on long term borrowing hedge, net of tax 8,681 1,515 12,912 20,029
Other comprehensive income (loss) net of tax 895 5,111 2,112 13,435
Other comprehensive income (loss), including cumulative effect adjustment, net of tax     3,884  
Comprehensive income $ 50,166 $ 47,181 $ 104,825 $ 96,751