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Employee benefit plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Components of net periodic pension benefit:        
Salaries and employee benefits expense $ 13,761 $ 8,450 $ 27,242 $ 17,289
Pension Benefits        
Components of net periodic pension benefit:        
Salaries and employee benefits expense 454 294 1,200 620
Interest cost 165 158 330 317
Expected return on plan assets (337) (320) (674) (641)
Amortization of unrecognized net loss 35 49 70 97
Net periodic pension benefit: $ (137) $ (113) $ (274) $ (227)