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Non-Interest Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Changes in Noncontrolling Interest [Line Items]      
Salaries and employee benefits $ 241,022 $ 256,966 $ 238,885
Occupancy and equipment 58,031 60,303 53,417
Data processing expense 36,494 36,329 34,942
Merger and acquisition expenses 0 0 49,594
Other operating expenses:      
Advertising 7,097 8,850 7,974
Amortization of intangibles 8,443 9,685 8,853
Electronic banking expense 13,444 14,313 13,632
Directors' fees 1,639 1,814 1,491
Due from bank service charges 1,131 1,115 1,255
FDIC and state assessment 15,388 25,530 8,428
Other expense 36,963 32,967 27,905
Insurance 3,634 3,567 3,705
Legal and accounting 8,961 5,230 9,401
Other professional fees 8,142 8,815 8,881
Operating supplies 2,680 3,138 3,120
Postage 2,060 2,081 2,078
Telephone 1,807 2,160 1,890
Total other operating expenses 111,389 119,265 98,789
Total non-interest expense 446,936 472,863 475,627
Hurricane expense      
Other operating expenses:      
Other expense $ 0 $ 0 $ 176