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Non-Interest Expense - Components of Non-Interest Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Noninterest Expense [Abstract]          
Salaries and employee benefits $ 64,318 $ 60,427 $ 126,173   $ 121,337
Occupancy and equipment 14,023 14,408 28,448   28,959
Data processing expense 8,364 8,935 16,922   18,082
Other operating expenses:          
Advertising 2,054 1,692 3,982   3,346
Amortization of intangibles 2,025 2,140 4,072 $ 4,163 4,280
Electronic banking expense 3,172 3,412 6,227   6,568
Directors’ fees 431 423 883   921
Due from bank service charges 283 282 564   558
FDIC and state assessment 1,636 5,494 5,023   8,812
Insurance 1,049 905 2,048   1,808
Legal and accounting 2,360 2,617 6,001   4,698
Other professional fees 2,211 2,108 4,158   4,344
Operating supplies 711 613 1,422   1,296
Postage 488 497 991   1,020
Telephone 419 444 855   914
Other expense 12,496 8,788 21,199   17,738
Total other operating expenses 29,335 29,415 57,425   56,303
Total non-interest expense $ 116,040 $ 113,185 $ 228,968   $ 224,681