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Derivatives and Hedging Activities (Details) - USD ($)
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Derivative [Line Items]    
Collateral, obligation to return securities $ 59,000,000  
Asset derivatives, fair value 11,879,000 $ 2,611,000
Liability derivatives, fair value 27,400,000 2,879,000
Interest rate swap agreements    
Derivative [Line Items]    
Notional amount 894,231,000  
Customer derivatives program 439,416,000  
Impact to the statement of operations 0  
Fee income 1,939,598 920,705
Loss recognized in other comprehensive income 9,205,790  
Interest rate swap agreements | Forward contracts    
Derivative [Line Items]    
Notional amount 400,000,000  
Client derivatives | Other assets    
Derivative [Line Items]    
Asset derivatives, fair value 11,879,000 2,611,000
Client derivatives | Other liabilities    
Derivative [Line Items]    
Liability derivatives, fair value 11,879,000 2,611,000
Commercial loan hedge    
Derivative [Line Items]    
Notional amount 54,815,000  
Commercial loan hedge | Other liabilities    
Derivative [Line Items]    
Liability derivatives, fair value 966,000 0
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 $ 14,555,000 $ 268,000