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Mortgage Servicing Rights (Details)
 12 Months Ended
Sep. 30, 2015
USD ($)
prepayment_speed_factor
Sep. 30, 2014
USD ($)
prepayment_speed_factor
Sep. 30, 2013
USD ($)
prepayment_speed_factor
Transfers and Servicing [Abstract]      
Mortgate Servicing Rights (MSR), Fair Value $ 3,095,000 $ 3,204,000 $ 3,129,000
Mortgate Servicing Rights (MSR), Average Discount Rate for estimating Fair Value 9.52% 10.04% 10.04%
Mortgate Servicing Rights (MSR), Average Prepayment Speed Factor for estimating Fair Value | prepayment_speed_factor 174 164 177
MSRs valuation allowances $ 0 $ 475,000