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Loans Receivable - Aging of loans receivable by class (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) loan	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) loan	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) loan
Loans Receivable
Gross loans	$ 292,152,000		$ 292,152,000		$ 276,341,000
Non-accrual loan balance	1,462,000		1,462,000		1,294,000
Troubled loan modifications during the period	0	$ 0	0	$ 0
Troubled loan modifications, defaults within 12 months of modification	0	$ 0	0	$ 0
Collateral dependent loans, no related allowance	280,749		280,749		27,650
Collateral dependent loans, with related allowance	0		0		0
Commitments to loan additional funds to the borrowers whose loans have determined to be collateral dependent	0		0
Mortgage loans in the process of foreclosure	0		0		324,000
Current
Loans Receivable
Gross loans	290,169,000		290,169,000		274,977,000
30 - 89 days
Loans Receivable
Gross loans	998,000		998,000		920,000
90+ days
Loans Receivable
Gross loans	$ 985,000		$ 985,000		$ 444,000
Number of participation loans still accruing \| loan	29		29		0
Loans greater than 90 days past due and still accruing interest	$ 24,962		$ 24,962
Residential \| One to four residential and home improvement
Loans Receivable
Gross loans	96,206,000		96,206,000		$ 109,580,000
Non-accrual loan balance	1,462,000		1,462,000		1,294,000
Residential \| One to four residential and home improvement \| Current
Loans Receivable
Gross loans	94,358,000		94,358,000		108,408,000
Residential \| One to four residential and home improvement \| 30 - 89 days
Loans Receivable
Gross loans	888,000		888,000		783,000
Residential \| One to four residential and home improvement \| 90+ days
Loans Receivable
Gross loans	960,000		960,000		389,000
Residential \| One to Four Residential
Loans Receivable
Gross loans	95,785,000		95,785,000		109,123,000
Non-accrual loan balance with related allowance	$ 254,790		$ 254,790		$ 257,044
Number of non-accrual loans with related allowance \| loan	1		1		1
Related allowance amount for non-accrual loans	$ 164,863		$ 164,863		$ 50,958
Residential \| Purchased and Participations
Loans Receivable
Gross loans	5,489,000		5,489,000		5,993,000
Residential \| Purchased and Participations \| Current
Loans Receivable
Gross loans	5,454,000		5,454,000		5,951,000
Residential \| Purchased and Participations \| 30 - 89 days
Loans Receivable
Gross loans	10,000		10,000
Residential \| Purchased and Participations \| 90+ days
Loans Receivable
Gross loans	25,000		25,000		42,000
Residential \| HELOC
Loans Receivable
Gross loans	6,511,000		6,511,000		5,431,000
Residential \| HELOC \| Current
Loans Receivable
Gross loans	6,411,000		6,411,000		5,281,000
Residential \| HELOC \| 30 - 89 days
Loans Receivable
Gross loans	100,000		100,000		137,000
Residential \| HELOC \| 90+ days
Loans Receivable
Gross loans					13,000
Residential \| Commercial and Industrial
Loans Receivable
Gross loans					23,169,000
Residential \| Commercial and Industrial \| Current
Loans Receivable
Gross loans					23,169,000
Commercial \| Commercial and Industrial
Loans Receivable
Gross loans	26,692,000		26,692,000		23,169,000
Commercial \| Commercial and Industrial \| Current
Loans Receivable
Gross loans	26,692,000		26,692,000
Commercial \| Commercial construction
Loans Receivable
Gross loans	49,556,000		49,556,000		46,124,000
Commercial \| Commercial construction \| Current
Loans Receivable
Gross loans	49,556,000		49,556,000		46,124,000
Commercial \| LOC
Loans Receivable
Gross loans	17,971,000		17,971,000		9,706,000
Commercial \| LOC \| Current
Loans Receivable
Gross loans	17,971,000		17,971,000		9,706,000
Commercial real estate \| Commercial real estate
Loans Receivable
Gross loans	89,727,000		89,727,000		76,338,000
Commercial real estate \| Commercial real estate \| Current
Loans Receivable
Gross loans	$ 89,727,000		$ 89,727,000		$ 76,338,000