Investment Securities - Additional Information (Details)	9 Months Ended	12 Months Ended
Sep. 30, 2026 USD ($) security	Dec. 31, 2025 USD ($)
Debt Securities, Available-for-sale [Line Items]
Investment securities portfolio, effective period	3 years 7 months 6 days	3 years 3 months 18 days
Number of investment securities with unrealized losses \| security	239
Percentage of gross unrealized losses (percent)	8.20%
Percentage of amortized investment securities portfolio (percent)	8.10%
Number of investment securities in a continuous loss position for over 12 months \| security	181
Loss duration (in months)	12 months
Allowance for credit losses on available-for-sale securities	$ 0
Allowance for credit losses on held-to-maturity securities	0
Accrued interest receivable	1,320,000	$ 1,305,000
Public deposits
Debt Securities, Available-for-sale [Line Items]
Securities pledged to secure public deposits	129,571,000	140,110,000
Federal Reserve Discount Window And U.S. Bankruptcy Trustee
Debt Securities, Available-for-sale [Line Items]
Securities pledged to secure public deposits	$ 572,000	$ 2,370,000

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Debt Securities, Available-for-Sale Securities and Held-to-Maturity Securities, Accrued Interest, after Allowance for Credit Loss

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