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Loans and Allowance for Credit Losses - Loan Aging Schedule (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Loans and Allowance for Credit Losses      
Total Loans $ 187,632,177 $ 175,459,048  
Nonaccrual 12,704 17,971 $ 36,961
Nonaccrual with an ACL 0 0  
Current Loans      
Loans and Allowance for Credit Losses      
Total Loans 185,438,588 173,570,291  
Loans Past Due 31-89 Days      
Loans and Allowance for Credit Losses      
Total Loans 1,876,426 1,870,786  
Loans Past Due 90+ Days      
Loans and Allowance for Credit Losses      
Total Loans 304,459 0  
Real estate | One to four family residential      
Loans and Allowance for Credit Losses      
Total Loans 130,077,444 122,239,967  
Nonaccrual   0 36,829
Nonaccrual with an ACL 0 0  
Real estate | One to four family residential | Current Loans      
Loans and Allowance for Credit Losses      
Total Loans 128,031,279 120,678,966  
Real estate | One to four family residential | Loans Past Due 31-89 Days      
Loans and Allowance for Credit Losses      
Total Loans 1,741,706 1,561,001  
Real estate | One to four family residential | Loans Past Due 90+ Days      
Loans and Allowance for Credit Losses      
Total Loans 304,459 0  
Real estate | Home equity      
Loans and Allowance for Credit Losses      
Total Loans 2,241,326 2,063,651  
Nonaccrual   0  
Nonaccrual with an ACL 0 0  
Real estate | Home equity | Current Loans      
Loans and Allowance for Credit Losses      
Total Loans 2,241,326 2,063,651  
Real estate | Home equity | Loans Past Due 31-89 Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Real estate | Home equity | Loans Past Due 90+ Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Real estate | Equity line of credit      
Loans and Allowance for Credit Losses      
Total Loans 5,823,673 4,146,620  
Nonaccrual   0  
Nonaccrual with an ACL 0 0  
Real estate | Equity line of credit | Current Loans      
Loans and Allowance for Credit Losses      
Total Loans 5,823,673 4,086,622  
Real estate | Equity line of credit | Loans Past Due 31-89 Days      
Loans and Allowance for Credit Losses      
Total Loans 0 59,998  
Real estate | Equity line of credit | Loans Past Due 90+ Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Real estate | Construction      
Loans and Allowance for Credit Losses      
Total Loans 6,755,376 3,978,450  
Nonaccrual   0  
Nonaccrual with an ACL 0 0  
Real estate | Construction | Current Loans      
Loans and Allowance for Credit Losses      
Total Loans 6,754,686 3,978,450  
Real estate | Construction | Loans Past Due 31-89 Days      
Loans and Allowance for Credit Losses      
Total Loans 690 0  
Real estate | Construction | Loans Past Due 90+ Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Real estate | Multi-family      
Loans and Allowance for Credit Losses      
Total Loans 1,271,343 1,485,002  
Nonaccrual   0  
Nonaccrual with an ACL 0 0  
Real estate | Multi-family | Current Loans      
Loans and Allowance for Credit Losses      
Total Loans 1,271,343 1,485,002  
Real estate | Multi-family | Loans Past Due 31-89 Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Real estate | Multi-family | Loans Past Due 90+ Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Real estate | Commercial      
Loans and Allowance for Credit Losses      
Total Loans 2,587,784 2,333,631  
Nonaccrual   0  
Nonaccrual with an ACL 0 0  
Real estate | Commercial | Current Loans      
Loans and Allowance for Credit Losses      
Total Loans 2,587,784 2,333,631  
Real estate | Commercial | Loans Past Due 31-89 Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Real estate | Commercial | Loans Past Due 90+ Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Commercial installment      
Loans and Allowance for Credit Losses      
Total Loans 3,513,472 4,373,435  
Nonaccrual   0  
Nonaccrual with an ACL 0 0  
Commercial installment | Current Loans      
Loans and Allowance for Credit Losses      
Total Loans 3,513,472 4,373,435  
Commercial installment | Loans Past Due 31-89 Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Commercial installment | Loans Past Due 90+ Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Consumer | Marine and recreational      
Loans and Allowance for Credit Losses      
Total Loans 31,150,048 30,800,279  
Nonaccrual   0  
Nonaccrual with an ACL 0 0  
Consumer | Marine and recreational | Current Loans      
Loans and Allowance for Credit Losses      
Total Loans 31,016,018 30,550,492  
Consumer | Marine and recreational | Loans Past Due 31-89 Days      
Loans and Allowance for Credit Losses      
Total Loans 134,030 249,787  
Consumer | Marine and recreational | Loans Past Due 90+ Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Consumer | Other consumer      
Loans and Allowance for Credit Losses      
Total Loans 4,211,711 4,038,013  
Nonaccrual 12,704 17,971 $ 132
Nonaccrual with an ACL 0 0  
Consumer | Other consumer | Current Loans      
Loans and Allowance for Credit Losses      
Total Loans 4,199,007 4,020,042  
Consumer | Other consumer | Loans Past Due 31-89 Days      
Loans and Allowance for Credit Losses      
Total Loans 0 0  
Consumer | Other consumer | Loans Past Due 90+ Days      
Loans and Allowance for Credit Losses      
Total Loans $ 0 $ 0