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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

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