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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Components of net periodic pension cost:        
Salaries and employee benefits expense $ 8,482 $ 7,851 $ 17,562 $ 15,891
Pension Benefits        
Components of net periodic pension cost:        
Salaries and employee benefits expense 360 308 837 597
Interest cost 164 114 328 228
Expected return on plan assets (293) (352) (585) (704)
Amortization of unrecognized net loss 50 50 99 99
Net periodic pension income: $ (79) $ (188) $ (158) $ (377)