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Derivatives and Hedging Activities (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Sep. 30, 2014
Interest rate swap agreements |  |
Derivative [Line Items] |  |
Notional amount | $ 736,232,000 | $ 264,169,000
Gain (loss) on derivative instruments | 0 |
Fee income included in miscellaneous loan fees | 937,000 |
Other assets | Interest rate contracts |  |
Derivative [Line Items] |  |
Asset derivatives, fair value | 5,429,000 | 2,879,000
Other liabilities | Interest rate contracts |  |
Derivative [Line Items] |  |
Liability derivatives, fair value | 5,429,000 | 2,879,000
Forward Contracts | Interest rate swap agreements |  |
Derivative [Line Items] |  |
Notional amount | 400,000,000 |
Gain (loss) recognized in other comprehensive income (loss), effective portion, net | (2,476,000) |
Forward Contracts | Other assets | Interest rate contracts |  |
Derivative [Line Items] |  |
Asset derivatives, fair value | 0 | 0
Forward Contracts | Other liabilities | Interest rate contracts |  |
Derivative [Line Items] |  |
Liability derivatives, fair value | $ 3,914,000 | $ 268,000

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