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Employee benefit plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Components of net periodic pension cost:    
Salaries and employee benefits expense $ 9,080 $ 8,040
Pension Benefits    
Components of net periodic pension cost:    
Salaries and employee benefits expense 478 256
Interest cost 164 114
Expected return on plan assets (293) (352)
Amortization of unrecognized net loss 50 50
Net periodic pension income: $ (79) $ (188)