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Employee benefit plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Components of net periodic pension cost:    
Salaries and employee benefits expense $ 8,839 $ 9,080
Pension Benefits    
Components of net periodic pension cost:    
Salaries and employee benefits expense 326 478
Interest cost 158 164
Expected return on plan assets (320) (293)
Amortization of unrecognized net loss 49 50
Net periodic pension income: $ (113) $ (79)