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Goodwill and Intangibles (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2021
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]                    
Goodwill $ 4,858 $ 4,858 $ 4,858 $ 4,858 $ 4,858 $ 4,858 $ 4,858 $ 4,858 $ 4,858 $ 4,858
Core deposit intangibles 768 1,000 $ 768 1,000 937 $ 824 $ 880 $ 1,064 $ 1,128 $ 1,192
Estimated useful life     10 years              
Goodwill impairment     $ 0   $ 0          
Aggregate amortization expense 56 $ 64 169 $ 192            
Audubon Savings Bank                    
Finite-Lived Intangible Assets [Line Items]                    
Goodwill 4,900   4,900              
Core deposit intangibles 1,400   1,400              
Fidelity Savings and Loan Association                    
Finite-Lived Intangible Assets [Line Items]                    
Core deposit intangibles 65   65              
Washington Savings Bank                    
Finite-Lived Intangible Assets [Line Items]                    
Core deposit intangibles $ 197   $ 197