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Business Segment Reporting - Schedule of Business Segment Financial Results (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Net interest income $ 534,366 $ 397,639
Provision for credit losses 27,000 86,000
Noninterest income 204,793 166,198
Salaries and employee benefits 219,681 221,398
Processing fees 42,059 40,850
Bankcard 11,841 12,795
Amortization of other intangible assets 23,460 17,482
Noninterest expense 380,883 384,787
Income before income taxes 331,276 93,050
Income tax expense (benefit) 69,838 11,717
Net Income (Loss) 261,438 81,333
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Net interest income 534,366 397,639
Provision for credit losses 27,000 86,000
Noninterest income 204,793 166,198
Salaries and employee benefits 146,987 136,771
Processing fees 19,080 18,756
Bankcard 11,870 12,795
Amortization of other intangible assets 2,047 1,889
Allocated technology, service, overhead 163,916 185,834
Other segment items 36,983 28,742
Noninterest expense 380,883 384,787
Income before income taxes 331,276 93,050
Income tax expense (benefit) 69,838 11,717
Net Income (Loss) 261,438 81,333
Average assets 70,428,000 59,977,000
Commercial Banking [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Net interest income 365,342 273,916
Provision for credit losses 23,777 66,751
Noninterest income 46,289 37,218
Salaries and employee benefits 56,426 53,586
Processing fees 4,028 3,664
Bankcard 2,848 3,173
Allocated technology, service, overhead 85,636 101,125
Other segment items 16,514 11,463
Noninterest expense 165,452 173,011
Income before income taxes 222,402 71,372
Income tax expense (benefit) 46,886 8,987
Net Income (Loss) 175,516 62,385
Average assets 34,938,000 30,029,000
Institutional Banking [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Net interest income 77,287 61,159
Provision for credit losses 497 435
Noninterest income 121,829 103,797
Salaries and employee benefits 50,637 47,186
Processing fees 10,670 10,649
Bankcard 6,512 6,037
Amortization of other intangible assets 1,972 1,786
Allocated technology, service, overhead 33,876 32,245
Other segment items 9,264 9,365
Noninterest expense 112,931 107,268
Income before income taxes 85,688 57,253
Income tax expense (benefit) 18,064 7,210
Net Income (Loss) 67,624 50,043
Average assets 21,498,000 18,324,000
Personal Banking [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Net interest income 91,737 62,564
Provision for credit losses 2,726 18,814
Noninterest income 36,675 25,183
Salaries and employee benefits 39,924 35,999
Processing fees 4,382 4,443
Bankcard 2,510 3,585
Amortization of other intangible assets 75 103
Allocated technology, service, overhead 44,404 52,464
Other segment items 11,205 7,914
Noninterest expense 102,500 104,508
Income before income taxes 23,186 (35,575)
Income tax expense (benefit) 4,888 (4,480)
Net Income (Loss) 18,298 (31,095)
Average assets $ 13,992,000 $ 11,624,000