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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 42,070 $ 41,723 $ 83,316 $ 76,821
Other comprehensive income (loss) net of tax:        
Net unrealized gain (loss) on available-for-sale investment securities 5,685 6,916 (11,394) (3,445)
Reclassification adjustment of net gain (loss) from sale of available-for-sale securities included in net income 0 0 968 0
Related tax benefit (expense) (2,089) (2,542) 3,832 1,266
Other comprehensive income (loss) for available for sale securities, net of tax 3,596 4,374 (6,594) (2,179)
Net unrealized gain (loss) on long-term borrowing hedge 2,395 (13,483) 31,666 (10,688)
Related tax benefit (expense) (880) 4,955 (11,637) 3,928
Other comprehensive income (loss) on long term borrowing hedge, net of tax 1,515 (8,528) 20,029 (6,760)
Other comprehensive income (loss) net of tax 5,111 (4,154) 13,435 (8,939)
Comprehensive income $ 47,181 $ 37,569 $ 96,751 $ 67,882