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Servicing Rights - Analysis of the changes in MSRs (Details) - USD ($)
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Freddie Mac      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Balance, beginning of year $ 2,206,000 $ 2,022,000 $ 1,823,000
Additions 1,733,000 747,000 687,000
Amortization (748,000) (563,000) (488,000)
Valuation allowance (211,000) 0 0
Balance, end of year 2,980,000 2,206,000 2,022,000
SBA      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Balance, beginning of year 202,000 6,000 2,000
Additions due to South Sound Acquisition 0 285,000 0
Other additions 13,000 2,000 7,000
Amortization (90,000) (83,000) (3,000)
Valuation allowance (10,000) (4,000) 0
Balance, end of year 115,000 202,000 6,000
SBA | South Sound Merger      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Valuation allowance $ 0 $ (4,000) $ 0