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MSRs: Summary of Fair Values (Details) - USD ($)
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Transfers and Servicing [Abstract]      
Mortgage Servicing Rights (MSR), Fair Value $ 3,556,000 $ 2,865,000 $ 3,095,000
Mortgage Servicing Rights (MSR), Average Discount Rate for estimating Fair Value 9.52% 9.52% 9.52%
Mortgage Servicing Rights (MSR), Average Prepayment Speed Factor for estimating Fair Value 159 209 174
MSRs valuation allowances $ 0 $ 0 $ 0