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Business Segment Reporting - Schedule of Segment Financial Results (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Net interest income $ 475,042 $ 247,376 $ 1,339,705 $ 731,918
Provision for credit losses 22,500 18,000 129,500 42,050
Noninterest income 203,298 158,743 591,681 462,906
Salaries and employee benefits 220,329 146,984 655,278 432,851
Processing fees 45,008 29,697 129,496 87,334
Bankcard 11,775 12,482 36,933 34,867
Amortization of other intangible assets 25,317 1,917 68,067 5,788
Noninterest expense 419,285 252,454 1,197,240 756,325
Income before income taxes 236,555 135,665 604,646 396,449
Income tax expense (benefit) 48,239 26,022 117,603 75,203
NET INCOME 188,316 109,643 487,043 321,246
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net interest income 475,042 247,376 1,339,705 731,918
Provision for credit losses 22,500 18,000 129,500 42,050
Noninterest income 203,298 158,743 591,681 462,906
Salaries and employee benefits 141,967 92,450 419,150 271,799
Processing fees 17,184 13,653 54,435 38,912
Bankcard 11,506 12,226 36,678 34,421
Amortization of other intangible assets 1,929 1,917 5,696 5,789
Allocated technology, service, overhead 209,177 108,863 572,083 335,685
Other segment items 37,522 23,345 109,198 69,719
Noninterest expense 419,285 252,454 1,197,240 756,325
Income before income taxes 236,555 135,665 604,646 396,449
Income tax expense (benefit) 48,239 26,022 117,603 75,203
NET INCOME 188,316 109,643 487,043 321,246
Average assets 68,495,000 43,267,000 65,142,000 42,586,000
Commercial Banking [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net interest income 331,555 168,353 928,091 487,498
Provision for credit losses 19,465 15,947 104,550 35,770
Noninterest income 56,089 31,383 136,527 104,195
Salaries and employee benefits 52,763 26,773 160,034 80,762
Processing fees 3,207 2,273 10,641 6,813
Bankcard 2,019 2,920 8,813 9,156
Allocated technology, service, overhead 115,530 47,941 311,770 150,972
Other segment items 13,512 7,916 39,433 24,029
Noninterest expense 187,031 87,823 530,691 271,732
Income before income taxes 181,148 95,966 429,377 284,191
Income tax expense (benefit) 36,940 18,407 83,513 53,909
NET INCOME 144,208 77,559 345,864 230,282
Average assets 34,215,000 21,525,000 32,731,000 21,386,000
Institutional Banking [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net interest income 60,997 44,757 188,487 144,708
Provision for credit losses 460 252 1,325 753
Noninterest income 115,379 99,598 327,171 285,199
Salaries and employee benefits 49,449 42,213 143,913 122,638
Processing fees 9,313 7,963 29,738 22,367
Bankcard 6,533 6,933 17,994 16,913
Amortization of other intangible assets 1,826 1,786 5,387 5,396
Allocated technology, service, overhead 33,955 32,079 98,120 96,128
Other segment items 9,537 9,037 27,863 26,686
Noninterest expense 110,613 100,011 323,015 290,128
Income before income taxes 65,303 44,092 191,318 139,026
Income tax expense (benefit) 13,317 8,457 37,211 26,372
NET INCOME 51,986 35,635 154,107 112,654
Average assets 20,060,000 14,596,000 19,131,000 14,194,000
Personal Banking [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net interest income 82,490 34,266 223,127 99,712
Provision for credit losses 2,575 1,801 23,625 5,527
Noninterest income 31,830 27,762 127,983 73,512
Salaries and employee benefits 39,755 23,464 115,203 68,399
Processing fees 4,664 3,417 14,056 9,732
Bankcard 2,954 2,373 9,871 8,352
Amortization of other intangible assets 103 131 309 393
Allocated technology, service, overhead 59,692 28,843 162,193 88,585
Other segment items 14,473 6,392 41,902 19,004
Noninterest expense 121,641 64,620 343,534 194,465
Income before income taxes (9,896) (4,393) (16,049) (26,768)
Income tax expense (benefit) (2,018) (842) (3,121) (5,078)
NET INCOME (7,878) (3,551) (12,928) (21,690)
Average assets $ 14,220,000 $ 7,146,000 $ 13,280,000 $ 7,006,000