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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 35,098 | $ 38,407
Other comprehensive income (loss) net of tax: |  |
Net unrealized gain (loss) on available-for-sale securities | (10,360) | 8,560
Related tax benefit (expense) | 3,807 | (3,146)
Other comprehensive income (loss) for available for sale securities, net of tax | (6,553) | 5,414
Net unrealized gain (loss) on long-term borrowing hedge | 2,795 | (4,249)
Related tax benefit (expense) | (1,027) | 1,562
Other comprehensive income (loss) on long term borrowing hedge, net of tax | 1,768 | (2,687)
Other comprehensive income (loss) net of tax | (4,785) | 2,727
Comprehensive income | $ 30,313 | $ 41,134

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