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Goodwill and Intangibles (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]        
Goodwill $ 4,858 $ 4,858 $ 4,858 $ 4,858
Core deposit intangibles $ 880 1,128 937 $ 1,192
Estimated useful life 10 years      
Goodwill impairment $ 0   $ 0  
Aggregate amortization expense 57 $ 64    
Audubon Savings Bank        
Finite-Lived Intangible Assets [Line Items]        
Goodwill 4,900      
Core deposit intangibles 1,400      
Fidelity Savings and Loan Association        
Finite-Lived Intangible Assets [Line Items]        
Core deposit intangibles 65      
Washington Savings Bank        
Finite-Lived Intangible Assets [Line Items]        
Core deposit intangibles $ 197