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Goodwill and Intangibles (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2022
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
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 566 768 $ 566 768 712 $ 615 $ 664 $ 824 $ 880 $ 937
Estimated useful life     10 years              
Goodwill impairment     $ 0   $ 0          
Aggregate amortization expense 49 $ 56 146 $ 169            
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