Investment and Equity Securities - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2026	Dec. 31, 2025
Schedule of Available-for-sale Securities [Line Items]
Federal Reserve stock owned by Company	$ 959,000	$ 959,000	$ 959,000
Federal Home Loan Bank stock (FHLB)	866,000	866,000	819,000
Allowance for credit losses for available for sale securities	0	0
Securities held to maturity	0	0
Securities available for sale pledged as collateral on public deposits	162,800,000	162,800,000	$ 167,400,000
Gain recognized on stock exchange	$ 827,000	$ 827,000
Common stock, shares outstanding	7,107,034	7,107,034	7,175,297
Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash received lieu of fractional shares	$ 1,000
Visa Incorporation [Member] \| Class B-1 common stock
Schedule of Available-for-sale Securities [Line Items]
Common stock shares issued in exchange offer	2,202
Visa Incorporation [Member] \| Class B-3 common stock
Schedule of Available-for-sale Securities [Line Items]
Common stock shares issued in exchange offer	550
Visa Incorporation [Member] \| Class C common stock
Schedule of Available-for-sale Securities [Line Items]
Common stock shares issued in exchange offer	633
Consideration received on exchange	$ 826,000
Shares sold in exchange offer	211
Common stock, shares outstanding	422	422
Past Due 30 Days or More
Schedule of Available-for-sale Securities [Line Items]
Securities held to maturity current	$ 0	$ 0

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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