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Loans - Summary of individually impaired loans (Details) - USD ($)
6 Months Ended 12 Months Ended
Dec. 31, 2022
Jun. 30, 2022
Recorded Investment    
Recorded Investment - With no related allowance $ 179,173 $ 193,385
Unpaid Principal Balance    
Unpaid Principal Balance - With no related allowance 179,173 193,385
Average Recorded Investment    
Average Recorded Investment - With no related allowance 182,876 199,080
Interest Income Recognized    
Interest Income Recognized - With no related allowance 2,980 13,428
Residential [Member] | One-to-four-family residential    
Recorded Investment    
Recorded Investment - With no related allowance 179,173 193,385
Unpaid Principal Balance    
Unpaid Principal Balance - With no related allowance 179,173 193,385
Average Recorded Investment    
Average Recorded Investment - With no related allowance 182,876 199,080
Interest Income Recognized    
Interest Income Recognized - With no related allowance $ 2,980 $ 13,428