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Investment Securities - Additional Information (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
security
Dec. 31, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Investment securities portfolio, effective period 3 years 4 months 24 days 3 years 3 months 18 days
Number of investment securities with unrealized losses | security 214  
Percentage of gross unrealized losses (percent) 6.30%  
Percentage of amortized investment securities portfolio (percent) 5.90%  
Number of investment securities in a continuous loss position for over 12 months | security 189  
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 1,121,000 $ 1,305,000
Public deposits    
Debt Securities, Available-for-sale [Line Items]    
Securities pledged to secure public deposits 139,863,000 140,110,000
Federal Reserve Discount Window And U.S. Bankruptcy Trustee    
Debt Securities, Available-for-sale [Line Items]    
Securities pledged to secure public deposits $ 0 $ 2,370,000