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Employee benefit plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Components of net periodic pension cost:    
Salaries and employee benefits expense $ 8,040 $ 6,570
Pension Benefits    
Components of net periodic pension cost:    
Salaries and employee benefits expense 256 306
Interest cost 114 105
Expected return on plan assets (352) (322)
Amortization of unrecognized net gain 50 76
Net periodic benefit $ (188) $ (141)