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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Components of net periodic pension benefit:        
Salaries and employee benefits expense $ 13,170 $ 8,784 $ 30,459 $ 26,346
Pension Benefits        
Components of net periodic pension benefit:        
Salaries and employee benefits expense 607 426 1,300 1,300
Interest cost 158 164 475 492
Expected return on plan assets (320) (293) (961) (878)
Amortization of unrecognized net loss 49 50 146 149
Net periodic pension benefit: $ (113) $ (79) $ (340) $ (237)