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Non-Interest Expense - Components of Non-Interest Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Noninterest Expense [Abstract]          
Salaries and employee benefits $ 58,861   $ 64,512 $ 180,198 $ 193,536
Occupancy and equipment 14,546   15,463 43,505 45,338
Data processing expense 9,088   9,103 27,170 27,222
Other operating expenses:          
Advertising 1,810   2,295 5,156 6,624
Amortization of intangibles 2,095 $ 2,253 2,477 6,375 7,432
Electronic banking expense 3,569   3,709 10,137 10,714
Directors’ fees 362   417 1,283 1,415
Due from bank service charges 302   282 860 841
FDIC and state assessment 3,360   2,794 12,172 9,514
Insurance 926   878 2,734 2,694
Legal and accounting 1,902   1,514 6,600 4,038
Other professional fees 2,062   2,117 6,406 7,175
Operating supplies 673   860 1,969 2,361
Postage 522   491 1,542 1,578
Telephone 455   544 1,369 1,645
Other expense 9,512   7,306 27,250 23,561
Total other operating expenses 27,550   25,684 83,853 79,592
Total non-interest expense $ 110,045   $ 114,762 $ 334,726 $ 345,688