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Segment Information - Summary Of Community Banking Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]                      
Total Assets $ 33,660,281       $ 30,023,545       $ 33,660,281 $ 30,023,545  
Net interest income 287,457 $ 280,115 $ 274,537 $ 260,055 232,608 $ 230,256 $ 225,715 $ 222,489 1,102,164 911,068 $ 919,924
Provision for credit losses 6,779 12,095 5,889 29,103 6,691 6,943 5,779 5,740 53,866 25,153 31,153
Other income                 135,154 123,695 135,258
Employee compensation                 252,054 234,618 230,809
Employee benefits                 54,333 53,621 48,368
Net occupancy expense                 49,794 46,084 46,426
OREO expense                 892 576 1,355
Net gains on the sales of OREO properties                 148 75 60
Equipment Expense                 34,917 29,686 29,731
Data processing expense                 32,622 29,646 29,395
Mortgage loan servicing expense and impairment                 0 2,694 5,596
Bankcard Processing Expense                 2,342 2,490 2,192
FDIC insurance expense                 17,022 19,735 30,376
Income before income taxes                 583,400 464,579 463,805
Income taxes 31,068 33,735 31,367 22,627 26,651 24,649 18,878 21,405 118,797 91,583 97,492
Segment net income                 464,603 372,996 366,313
Net Income (Loss) 128,828 [1] $ 130,748 [1] $ 120,721 [1] $ 84,306 [1] 94,408 [1] $ 95,267 [1] $ 96,507 [1] $ 86,814 [1] 464,603 372,996 366,313
Operating Segments [Member] | Community Banking [Member]                      
Segment Reporting Information [Line Items]                      
Total Assets $ 33,660,281       $ 30,023,545       33,660,281 30,023,545 29,926,482
Net interest income                 1,102,164 911,068 919,924
Provision for credit losses                 53,866 25,153 31,153
Other income                 135,154 123,695 135,258
Employee compensation                 252,054 234,618 230,809
Employee benefits                 54,333 53,621 48,368
Net occupancy expense                 49,794 46,084 46,426
OREO expense                 892 576 1,355
Net gains on the sales of OREO properties                 (148) (75) (60)
Equipment Expense                 34,917 29,686 29,731
Data processing expense                 32,622 29,646 29,395
Mortgage loan servicing expense and impairment                 0 2,694 5,596
Bankcard Processing Expense                 2,342 2,490 2,192
FDIC insurance expense                 17,022 19,735 30,376
Other segment expense [2]                 156,224 125,956 136,036
Total other expense                 600,052 545,031 560,224
Income before income taxes                 583,400 464,579 463,805
Income taxes                 118,797 91,583 97,492
Segment net income                 464,603 372,996 366,313
Adjustments and reconciling items                 0 0 0
Net Income (Loss)                 $ 464,603 $ 372,996 $ 366,313
[1] For further information, see the related discussion “Quarterly Results” included in Management’s Discussion and Analysis.
[2] Other segment expense includes legal, consulting and other professional services expense, franchise and other taxes not on income, expense for reserve on lending-related commitments, ATM expenses, marketing expense, core deposits amortization, and other general operating expenses.