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Operating Segments - Summary of Operating Results by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Interest income | $ 601,958 | $ 596,285 | $ 1,187,075 | $ 1,181,785
Interest expense | 172,354 | 199,573 | 341,251 | 395,022
Net interest income (expense) | 429,604 | 396,712 | 845,824 | 786,763
Credit loss expense | 13,129 | 15,787 | 26,199 | 29,437
Net interest income after credit loss expense | 416,475 | 380,925 | 819,625 | 757,326
Trust and investment management fees | 43,669 | 41,404 | 86,600 | 80,489
Service charges on deposit accounts | 29,151 | 26,114 | 57,772 | 50,909
Insurance commissions and fees | 13,879 | 13,919 | 34,898 | 32,215
Interchange and card transaction fees | 5,619 | 5,351 | 11,021 | 9,825
Other charges, commissions, and fees | 13,967 | 13,020 | 27,553 | 25,080
Net gain (loss) on securities transactions | 0 | 0 | (14) | 0
Other | 10,988 | 11,382 | 23,454 | 24,049
Total non-interest income | 117,273 | 111,190 | 241,284 | 222,567
Salaries and wages | 162,149 | 151,237 | 323,006 | 299,237
Employee benefits | 32,826 | 28,802 | 74,983 | 64,772
Net occupancy | 34,640 | 32,374 | 67,917 | 64,152
Technology, furniture, and equipment | 40,572 | 35,951 | 80,690 | 70,946
Deposit insurance | 6,590 | 8,383 | 13,774 | 23,107
Other | 70,351 | 60,217 | 134,824 | 120,967
Total non-interest expense | 347,128 | 316,964 | 695,194 | 643,181
Income (loss) before income taxes | 186,620 | 175,151 | 365,715 | 336,712
Income tax expense (benefit) | 29,617 | 29,652 | 57,790 | 55,523
Net income (loss) | 157,003 | 145,499 | 307,925 | 281,189
Preferred stock dividends | 1,669 | 1,669 | 3,338 | 3,338
Net income (loss) available to common shareholders | 155,334 | 143,830 | 304,587 | 277,851
Revenues from (expenses to) external customers | 546,877 | 507,902 | 1,087,108 | 1,009,330
Average assets (in millions) | 51,191,000 | 48,960,000 | 51,064,000 | 49,142,000
Bank |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 599,875 | 594,264 | 1,183,116 | 1,177,993
Interest expense | 169,150 | 202,924 | 334,850 | 387,918
Net interest income (expense) | 430,725 | 398,270 | 848,266 | 790,075
Credit loss expense | 13,129 | 15,787 | 26,199 | 29,437
Net interest income after credit loss expense | 417,596 | 382,483 | 822,067 | 760,638
Trust and investment management fees | 0 | 0 | 0 | 0
Service charges on deposit accounts | 29,149 | 26,111 | 57,767 | 50,903
Insurance commissions and fees | 13,879 | 13,919 | 34,898 | 32,215
Interchange and card transaction fees | 5,619 | 5,351 | 11,021 | 9,825
Other charges, commissions, and fees | 8,031 | 7,364 | 15,437 | 14,489
Net gain (loss) on securities transactions | 0 | 0 | (14) | 0
Other | 9,002 | 9,433 | 20,387 | 21,126
Total non-interest income | 65,680 | 62,178 | 139,496 | 128,558
Salaries and wages | 142,089 | 132,831 | 283,181 | 262,863
Employee benefits | 29,244 | 25,663 | 66,582 | 57,537
Net occupancy | 30,893 | 28,872 | 60,629 | 57,008
Technology, furniture, and equipment | 39,178 | 34,530 | 77,735 | 68,045
Deposit insurance | 6,579 | 8,353 | 13,750 | 23,066
Other | 54,412 | 45,947 | 105,240 | 94,507
Total non-interest expense | 302,395 | 276,196 | 607,117 | 563,026
Income (loss) before income taxes | 180,881 | 168,465 | 354,446 | 326,170
Income tax expense (benefit) | 28,891 | 28,819 | 56,417 | 54,454
Net income (loss) | 151,990 | 139,646 | 298,029 | 271,716
Preferred stock dividends | 0 | 0 | 0 | 0
Net income (loss) available to common shareholders | 151,990 | 139,646 | 298,029 | 271,716
Revenues from (expenses to) external customers | 496,405 | 460,448 | 987,762 | 918,633
Average assets (in millions) | 51,117,000 | 48,897,000 | 50,987,000 | 49,074,000
Frost Wealth Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 2,083 | 2,021 | 3,959 | 3,792
Interest expense | 99 | 114 | 188 | 216
Net interest income (expense) | 1,984 | 1,907 | 3,771 | 3,576
Credit loss expense | 0 | 0 | 0 | 0
Net interest income after credit loss expense | 1,984 | 1,907 | 3,771 | 3,576
Trust and investment management fees | 43,844 | 41,950 | 87,388 | 81,530
Service charges on deposit accounts | 2 | 3 | 5 | 6
Insurance commissions and fees | 0 | 0 | 0 | 0
Interchange and card transaction fees | 0 | 0 | 0 | 0
Other charges, commissions, and fees | 5,936 | 5,656 | 12,116 | 10,591
Net gain (loss) on securities transactions | 0 | 0 | 0 | 0
Other | 1,928 | 1,880 | 2,951 | 2,788
Total non-interest income | 51,710 | 49,489 | 102,460 | 94,915
Salaries and wages | 19,664 | 18,001 | 39,033 | 35,563
Employee benefits | 3,557 | 3,112 | 8,351 | 7,182
Net occupancy | 3,747 | 3,502 | 7,288 | 7,144
Technology, furniture, and equipment | 1,344 | 1,368 | 2,852 | 2,800
Deposit insurance | 11 | 30 | 24 | 41
Other | 13,414 | 11,862 | 26,054 | 23,118
Total non-interest expense | 41,737 | 37,875 | 83,602 | 75,848
Income (loss) before income taxes | 11,957 | 13,521 | 22,629 | 22,643
Income tax expense (benefit) | 2,511 | 2,839 | 4,752 | 4,755
Net income (loss) | 9,446 | 10,682 | 17,877 | 17,888
Preferred stock dividends | 0 | 0 | 0 | 0
Net income (loss) available to common shareholders | 9,446 | 10,682 | 17,877 | 17,888
Revenues from (expenses to) external customers | 53,694 | 51,396 | 106,231 | 98,491
Average assets (in millions) | 65,000 | 54,000 | 68,000 | 59,000
Non-Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 3,105 | (3,465) | 6,213 | 6,888
Net interest income (expense) | (3,105) | (3,465) | (6,213) | (6,888)
Credit loss expense | 0 | 0 | 0 | 0
Net interest income after credit loss expense | (3,105) | (3,465) | (6,213) | (6,888)
Trust and investment management fees | (175) | (546) | (788) | (1,041)
Service charges on deposit accounts | 0 | 0 | 0 | 0
Insurance commissions and fees | 0 | 0 | 0 | 0
Interchange and card transaction fees | 0 | 0 | 0 | 0
Other charges, commissions, and fees | 0 | 0 | 0 | 0
Net gain (loss) on securities transactions | 0 | 0 | 0 | 0
Other | 58 | 69 | 116 | 135
Total non-interest income | (117) | (477) | (672) | (906)
Salaries and wages | 396 | 405 | 792 | 811
Employee benefits | 25 | 27 | 50 | 53
Net occupancy | 0 | 0 | 0 | 0
Technology, furniture, and equipment | 50 | 53 | 103 | 101
Deposit insurance | 0 | 0 | 0 | 0
Other | 2,525 | 2,408 | 3,530 | 3,342
Total non-interest expense | 2,996 | 2,893 | 4,475 | 4,307
Income (loss) before income taxes | (6,218) | (6,835) | (11,360) | (12,101)
Income tax expense (benefit) | (1,785) | (2,006) | (3,379) | (3,686)
Net income (loss) | (4,433) | (4,829) | (7,981) | (8,415)
Preferred stock dividends | 1,669 | 1,669 | 3,338 | 3,338
Net income (loss) available to common shareholders | (6,102) | (6,498) | (11,319) | (11,753)
Revenues from (expenses to) external customers | (3,222) | (3,942) | (6,885) | (7,794)
Average assets (in millions) | $ 9,000 | $ 9,000 | $ 9,000 | $ 9,000

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