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Employee benefit plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Components of net periodic pension benefit:    
Salaries and employee benefits expense $ 13,481 $ 8,839
Pension Benefits    
Components of net periodic pension benefit:    
Salaries and employee benefits expense 724 326
Interest cost 165 158
Expected return on plan assets (337) (320)
Amortization of unrecognized net loss 35 49
Net periodic pension benefit: $ (137) $ (113)