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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Components of net periodic pension cost:        
Salaries and employee benefits expense $ 8,450 $ 8,482 $ 17,289 $ 17,562
Pension Benefits        
Components of net periodic pension cost:        
Salaries and employee benefits expense 294 360 620 837
Interest cost 158 164 317 328
Expected return on plan assets (320) (293) (641) (585)
Amortization of unrecognized net loss 49 50 97 99
Net periodic pension income: $ (113) $ (79) $ (227) $ (158)