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Derivatives and Hedging Activities (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2015
Derivative [Line Items] |  |  |
Gain (loss) on derivative instruments | $ 0 |  |
Other comprehensive income (loss) on long term borrowing hedge, net of tax | 1,768,000 | $ (2,687,000) |
Derivative asset, fair value, gross asset | 9,656,000 |  | $ 11,879,000
Derivative liability, fair value, gross liability | 21,980,000 |  | 27,400,000
Interest rate swap agreements |  |  |
Derivative [Line Items] |  |  |
Customer derivatives program | 474,900,000 |  | 439,416,000
Notional amount | 54,155,000 |  | 54,815,000
Interest rate contracts | Other assets |  |  |
Derivative [Line Items] |  |  |
Derivative asset, fair value, gross asset | 9,656,000 |  | 11,879,000
Interest rate contracts | Other liabilities |  |  |
Derivative [Line Items] |  |  |
Derivative liability, fair value, gross liability | 9,656,000 |  | 11,879,000
Commercial loan hedge | Other assets |  |  |
Derivative [Line Items] |  |  |
Derivative asset, fair value, gross asset | 0 |  | 0
Commercial loan hedge | Other liabilities |  |  |
Derivative [Line Items] |  |  |
Derivative liability, fair value, gross liability | 565,000 |  | 966,000
Long term borrowing hedge | Other assets |  |  |
Derivative [Line Items] |  |  |
Derivative asset, fair value, gross asset | 0 |  | 0
Long term borrowing hedge | Other liabilities |  |  |
Derivative [Line Items] |  |  |
Derivative liability, fair value, gross liability | 11,759,000 |  | 14,555,000
Forward Contracts | Interest rate swap agreements |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 400,000,000 |  | $ 400,000,000

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