Disclosures About Fair Value of Assets - Carrying value and estimated fair value of financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financial assets:
Available-for-sale Debt Securities Fair Value	$ 63,160	$ 66,930
Held-to-maturity debt securities	4,127	6,184
Equity securities	277	408
Recurring
Financial assets:
Available-for-sale Debt Securities Fair Value	63,160	66,930
Recurring \| Carrying Value
Financial assets:
Cash and cash equivalents	19,473	15,494
Available-for-sale Debt Securities Fair Value	63,160	66,930
Held-to-maturity debt securities	4,207	6,205
Equity securities	277	408
Loans	111,560	108,869
Interest receivable	724	757
Federal Home Loan Bank Stock	375	354
Cash surrender value of bank-owned life insurance	4,142	4,086
Financial liabilities:
Deposits	167,501	166,478
Interest payable		1
Recurring \| Level 1
Financial assets:
Available-for-sale Debt Securities Fair Value		574
Recurring \| Level 1 \| Carrying Value
Financial assets:
Cash and cash equivalents	19,473	15,494
Available-for-sale Debt Securities Fair Value		574
Equity securities	215	346
Interest receivable	724	757
Financial liabilities:
Interest payable		1
Recurring \| Level 2
Financial assets:
Available-for-sale Debt Securities Fair Value	63,160	66,356
Recurring \| Level 2 \| Carrying Value
Financial assets:
Available-for-sale Debt Securities Fair Value	63,160	66,356
Held-to-maturity debt securities	4,127	6,184
Equity securities	62	62
Recurring \| Level 3 \| Carrying Value
Financial assets:
Loans	108,276	105,717
Federal Home Loan Bank Stock	375	354
Cash surrender value of bank-owned life insurance	4,142	4,086
Financial liabilities:
Deposits	$ 149,738	$ 152,948

The fair value portion of interest payable.

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The fair value portion of interest receivable.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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