Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments Carried at Amortized Cost (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financial assets
Securities held-to-maturity	$ 172,478	$ 172,603
Loans held for sale	0	283
Carrying Value [Member]
Financial assets
Securities held-to-maturity	200,000	204,309
Loans held for sale		283
Net loans	753,266	730,046
Financial liabilities
Deposits	1,070,777	1,044,887
Other borrowings	1,236	1,266
Carrying Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	621	621
Fair Value [Member]
Financial assets
Securities held-to-maturity	172,478	172,603
Loans held for sale		290
Net loans	720,101	691,816
Financial liabilities
Deposits	1,072,736	1,044,047
Other borrowings	1,104	1,111
Fair Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	621	621
Fair Value [Member] \| Level I [Member]
Financial assets
Loans held for sale		290
Financial liabilities
Deposits	808,652	801,634
Fair Value [Member] \| Level II [Member]
Financial assets
Securities held-to-maturity	172,478	172,603
Fair Value [Member] \| Level III [Member]
Financial assets
Net loans	720,101	691,816
Financial liabilities
Deposits	264,084	242,413
Other borrowings	1,104	1,111
Fair Value [Member] \| Level III [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	$ 621	$ 621

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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

+ References

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

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