v3.26.1
Securities - Additional Information (Detail)
 6 Months Ended
Jun. 30, 2026
USD ($)
Security
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Debt and Equity Securities, FV-NI [Line Items]      
Fair value of pledged securities $ 133,000,000   $ 134,000,000
Restricted stock investment in FHLB stock 1,100,000   1,100,000
Federal Reserve Bank stock 471,000   471,000
Proceeds from sale of available-for-sale securities $ 0 $ 0  
Number of securities in an unrealized loss position, Total | Security 96    
Number of securities in continuous unrealized loss position, 12 months or more | Security 76    
Held to maturity security, allowance for credit loss $ 0   0
Total available-for-sale securities 121,067,000   $ 132,217,000
US Treasury Securities And US Government Sponsored Agency Bonds [Member]      
Debt and Equity Securities, FV-NI [Line Items]      
Total available-for-sale securities 96,000,000    
Non-agency Debt Securities [Member]      
Debt and Equity Securities, FV-NI [Line Items]      
Total available-for-sale securities 25,000,000    
Non-agency Debt Securities [Member] | Non-rated Debt Securities [Member]      
Debt and Equity Securities, FV-NI [Line Items]      
Total available-for-sale securities $ 7,000,000