v3.26.3
Segment Information - Summary Of Community Banking Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]                
Net interest income $ 294,251     $ 280,115     $ 862,078 $ 814,707
Provision for credit losses 6,241     12,095     18,978 47,087
Other income 30,845     43,204     103,414 104,218
Employee compensation 69,391     64,092     199,433 187,887
Employee benefits 12,621     14,641     44,897 41,366
Net occupancy expense 12,809     12,488     38,930 37,614
Software and equipment expense 9,597     8,540     27,772 25,673
OREO expense 298     201     1,289 459
Net losses on the sales of OREO properties (20)     0     (57) (5)
Data processing expense 7,142     8,135     21,291 24,542
Bankcard Processing Expense 635     576     1,889 1,764
FDIC insurance expense 4,425     4,345     13,451 13,605
Income before income taxes 162,141     164,483     482,271 423,504
Income taxes 33,437     33,735     97,990 87,729
Net Income (Loss) 128,704 $ 131,377 $ 124,200 130,748 $ 120,721 $ 84,306 384,281 335,775
Operating Segments [Member] | Community Banking [Member]                
Segment Reporting [Line Items]                
Net interest income 294,251     280,115     862,078 814,707
Provision for credit losses 6,241     12,095     18,978 47,087
Other income 30,845     43,204     103,414 104,218
Employee compensation 69,391     64,092     199,433 187,887
Employee benefits 12,621     14,641     44,897 41,366
Net occupancy expense 12,809     12,488     38,930 37,614
Software and equipment expense 9,597     8,540     27,772 25,673
OREO expense 298     201     1,289 459
Net losses on the sales of OREO properties 20     0     57 5
Data processing expense 7,142     8,135     21,291 24,542
Bankcard Processing Expense 635     576     1,889 1,764
FDIC insurance expense 4,425     4,345     13,451 13,605
Other segment expense [1] 39,776     33,723     115,234 115,419
Total other expense 156,714     146,741     464,243 448,334
Income before income taxes 162,141     164,483     482,271 423,504
Income taxes 33,437     33,735     97,990 87,729
Segment net income 128,704     130,748     384,281 335,775
Adjustments and reconciling items 0     0     0 0
Net Income (Loss) $ 128,704     $ 130,748     $ 384,281 $ 335,775
[1] 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.