v3.25.4
Employee Benefits - Schedule of Net Pension Cost and Funded Status (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Schedule Of Net Pension Cost And Funded Status [Line Items]    
Net pension cost charged to salaries and employee benefits $ 65 $ 65
Pentegra defined benefit plan funded status as of July 1 113.79% 111.97%
Contributions paid to the plan $ 105 $ 74
Plan's Funded Status [Member]    
Schedule Of Net Pension Cost And Funded Status [Line Items]    
Pentegra defined benefit plan funded status as of July 1 91.36% 88.99%