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Non-Interest Expense - Components of Non-Interest Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Noninterest Expense [Abstract]          
Salaries and employee benefits $ 60,427 $ 64,534 $ 121,337   $ 129,024
Occupancy and equipment 14,408 14,923 28,959   29,875
Data processing expense 8,935 9,151 18,082   18,119
Other operating expenses:          
Advertising 1,692 2,098 3,346   4,329
Amortization of intangibles 2,140 2,478 4,280 $ 4,730 4,955
Electronic banking expense 3,412 3,675 6,568   7,005
Directors’ fees 423 538 921   998
Due from bank service charges 282 286 558   559
FDIC and state assessment 5,494 3,220 8,812   6,720
Insurance 905 927 1,808   1,816
Legal and accounting 2,617 1,436 4,698   2,524
Other professional fees 2,108 2,774 4,344   5,058
Operating supplies 613 763 1,296   1,501
Postage 497 586 1,020   1,087
Telephone 444 573 914   1,101
Other expense 8,788 8,320 17,738   16,255
Total other operating expenses 29,415 27,674 56,303   53,908
Total non-interest expense $ 113,185 $ 116,282 $ 224,681   $ 230,926