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Loans - Activity in the allowance for credit losses by portfolio segment (Details)
 12 Months Ended
Jun. 30, 2024
USD ($)
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year $ 2,158,590
Recoveries 3,000
Provision (190,000)
Balance at end of period 1,797,116
Consumer  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 2,000
Recoveries 3,000
Provision (11,000)
Balance at end of period 5,000
Commercial real estate | Commercial real estate  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 1,196,479
Provision (119,000)
Balance at end of period 259,000
Commercial | Commercial and industrial  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 17,711
Provision (7,000)
Balance at end of period 16,000
Commercial | Construction  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 6,302
Provision 20,000
Balance at end of period 28,000
Residential | One-to-four-family residential  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 206,771
Provision (30,000)
Balance at end of period 1,314,000
Residential | Multi-family real estate  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 365,401
Provision (43,000)
Balance at end of period 175,000
Consumer Loans | Consumer  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 653
Unallocated  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 365,273
Accounting Standards Update 2016-13  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year (175,000)
Accounting Standards Update 2016-13 | Cumulative effect of accounting change  
Activity in the allowance for credit losses - loans by loan class  
Balance at end of period 175,000
Accounting Standards Update 2016-13 | Consumer  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 11,000
Accounting Standards Update 2016-13 | Commercial real estate | Commercial real estate  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year (818,000)
Accounting Standards Update 2016-13 | Commercial | Commercial and industrial  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 5,000
Accounting Standards Update 2016-13 | Commercial | Construction  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 2,000
Accounting Standards Update 2016-13 | Residential | One-to-four-family residential  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year 1,137,000
Accounting Standards Update 2016-13 | Residential | Multi-family real estate  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year (147,000)
Accounting Standards Update 2016-13 | Unallocated  
Activity in the allowance for credit losses - loans by loan class  
Balance at beginning of year $ (365,000)