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Derivatives and Hedging Activities (Details) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Interest rate swap agreements
    
Derivative [Line Items]    
Notional amount $ 464,169,000  
Customer derivatives program 264,169,000  
Impact to the statement of operations 0  
Fee income 920,705 552,609
Impact on OCI 170,000  
Interest rate contracts | Other assets
    
Derivative [Line Items]    
Asset derivatives, fair value 2,879,000 7,000
Interest rate contracts | Other liabilities
    
Derivative [Line Items]    
Liability derivatives, fair value 2,879,000 7,000
Commitments to purchase MBS | AFS securities
    
Derivative [Line Items]    
Notional amount 0 200,000,000
Asset derivatives, fair value 0 3,188,000
Forward Contracts | Interest rate swap agreements
    
Derivative [Line Items]    
Notional amount $ 200,000,000