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Derivatives and Hedging Activities (Details) - USD ($)
 9 Months Ended
Jun. 30, 2016
Sep. 30, 2015
Derivative [Line Items]    
Gain (loss) on derivative instruments $ 0  
Derivative asset, fair value, gross asset 22,085,000 $ 11,879,000
Derivative liability, fair value, gross liability 61,012,000 27,400,000
Interest rate swap agreements    
Derivative [Line Items]    
Customer derivatives program 557,930,000 439,416,000
Notional amount 54,155,000 54,815,000
Interest rate swap agreements | Forward Contracts    
Derivative [Line Items]    
Notional amount 700,000,000 400,000,000
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 35,533,000 14,555,000
Interest rate contracts | Other assets    
Derivative [Line Items]    
Derivative asset, fair value, gross asset 22,085,000 11,879,000
Interest rate contracts | Other liabilities    
Derivative [Line Items]    
Derivative liability, fair value, gross liability 22,085,000 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 $ 3,394,000 $ 966,000