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Loans - Summary of individually impaired loans (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Recorded Investment    
Recorded Investment - With no related allowance $ 156,056 $ 193,385
Unpaid Principal Balance    
Unpaid Principal Balance - With no related allowance 156,056 193,385
Average Recorded Investment    
Average Recorded Investment - With no related allowance 465,555 199,080
Interest Income Recognized    
Interest Income Recognized - With no related allowance 9,150 13,428
Commercial real estate [Member] | Commercial and industrial    
Recorded Investment    
Recorded Investment - With no related allowance 23,549  
Unpaid Principal Balance    
Unpaid Principal Balance - With no related allowance 23,549  
Average Recorded Investment    
Average Recorded Investment - With no related allowance 327,580  
Interest Income Recognized    
Interest Income Recognized - With no related allowance 7,648  
Residential [Member] | One-to-four-family residential    
Recorded Investment    
Recorded Investment - With no related allowance 132,507 193,385
Unpaid Principal Balance    
Unpaid Principal Balance - With no related allowance 132,507 193,385
Average Recorded Investment    
Average Recorded Investment - With no related allowance 137,975 199,080
Interest Income Recognized    
Interest Income Recognized - With no related allowance $ 1,502 $ 13,428