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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 41,723 | $ 40,361 | $ 76,821 | $ 78,768
Other comprehensive income (loss) net of tax: |  |  |  |
Net unrealized gain (loss) on available-for-sale securities | 6,916 | 5,063 | (3,445) | 13,623
Related tax benefit (expense) | (2,542) | (1,860) | 1,266 | (5,006)
Other comprehensive income (loss) for available for sale securities, net of tax | 4,374 | 3,203 | (2,179) | 8,617
Net unrealized gain (loss) on long-term borrowing hedge | (13,483) | (4,985) | (10,688) | (9,233)
Related tax benefit (expense) | 4,955 | 1,832 | 3,928 | 3,393
Other comprehensive income (loss) on long term borrowing hedge, net of tax | (8,528) | (3,153) | (6,760) | (5,840)
Other comprehensive income (loss) net of tax | (4,154) | 50 | (8,939) | 2,777
Comprehensive income | $ 37,569 | $ 40,411 | $ 67,882 | $ 81,545

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