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Fair Value Measurements, Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Financial Assets [Abstract]    
Available-for-sale securities $ 7,747 $ 6,035
Mortgage servicing rights 3,690 155
U.S. GSE Securities [Member] | Residential Mortgage Backed Securities [Member]    
Financial Assets [Abstract]    
Available-for-sale securities 833 962
Corporate Bonds [Member]    
Financial Assets [Abstract]    
Available-for-sale securities 6,914 5,073
Recurring [Member]    
Financial Assets [Abstract]    
Total 11,437 6,190
Recurring [Member] | U.S. GSE Securities [Member] | Residential Mortgage Backed Securities [Member]    
Financial Assets [Abstract]    
Available-for-sale securities 833 962
Recurring [Member] | Corporate Bonds [Member]    
Financial Assets [Abstract]    
Available-for-sale securities 6,914 5,073
Recurring [Member] | Mortgage Servicing Rights [Member]    
Financial Assets [Abstract]    
Mortgage servicing rights 3,690 155
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial Assets [Abstract]    
Total 0 0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. GSE Securities [Member] | Residential Mortgage Backed Securities [Member]    
Financial Assets [Abstract]    
Available-for-sale securities 0 0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Bonds [Member]    
Financial Assets [Abstract]    
Available-for-sale securities 0 0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage Servicing Rights [Member]    
Financial Assets [Abstract]    
Mortgage servicing rights 0 0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial Assets [Abstract]    
Total 7,747 6,035
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. GSE Securities [Member] | Residential Mortgage Backed Securities [Member]    
Financial Assets [Abstract]    
Available-for-sale securities 833 962
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]    
Financial Assets [Abstract]    
Available-for-sale securities 6,914 5,073
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage Servicing Rights [Member]    
Financial Assets [Abstract]    
Mortgage servicing rights 0 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial Assets [Abstract]    
Total 3,690 155
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. GSE Securities [Member] | Residential Mortgage Backed Securities [Member]    
Financial Assets [Abstract]    
Available-for-sale securities 0 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds [Member]    
Financial Assets [Abstract]    
Available-for-sale securities 0 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]    
Financial Assets [Abstract]    
Mortgage servicing rights $ 3,690 $ 155