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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Components of net periodic pension cost:        
Salaries and employee benefits expense $ 8,784 $ 8,474 $ 26,346 $ 24,365
Pension Benefits        
Components of net periodic pension cost:        
Salaries and employee benefits expense 426 373 1,300 970
Interest cost 164 114 492 342
Expected return on plan assets (293) (352) (878) (1,056)
Amortization of unrecognized net loss 50 50 149 149
Net periodic pension income: $ (79) $ (188) $ (237) $ (565)