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Derivatives and Hedging Activities (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Derivative [Line Items] |  |
Asset derivatives, fair value | $ 20,895 | $ 11,879
Liability derivatives, fair value | 55,554 | 27,400
Interest rate swap agreements |  |
Derivative [Line Items] |  |
Customer derivatives program | 840,935 | 439,416
Notional amount | 700,000 | 400,000
Interest rate contract | Other assets |  |
Derivative [Line Items] |  |
Asset derivatives, fair value | 20,895 | 11,879
Interest rate contract | Other liabilities |  |
Derivative [Line Items] |  |
Liability derivatives, fair value | 20,895 | 11,879
Commercial loan hedge |  |
Derivative [Line Items] |  |
Notional amount | 54,155 | 54,815
Commercial loan hedge | Other assets |  |
Derivative [Line Items] |  |
Asset derivatives, fair value | 0 | 0
Commercial loan hedge | Other liabilities |  |
Derivative [Line Items] |  |
Liability derivatives, fair value | 3,312 | 966
Long term borrowing hedge | Other assets |  |
Derivative [Line Items] |  |
Asset derivatives, fair value | 0 | 0
Long term borrowing hedge | Other liabilities |  |
Derivative [Line Items] |  |
Liability derivatives, fair value | 31,347 | $ 14,555
Related Party Loan | Interest rate swap agreements |  |
Derivative [Line Items] |  |
Customer derivatives program | $ 34,432 |

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