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Employee benefit plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Components of net periodic pension benefit:        
Salaries and employee benefits expense $ 14,128 $ 13,170 $ 41,370 $ 30,459
Pension Benefits        
Components of net periodic pension benefit:        
Salaries and employee benefits expense 531 607 1,700 1,300
Interest cost 166 158 496 475
Expected return on plan assets (337) (320) (1,011) (961)
Amortization of unrecognized net loss 35 49 106 146
Net periodic pension benefit: $ (136) $ (113) $ (409) $ (340)