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Operating Segments (Summary of Operating Results by Segment) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Interest income | $ 2,390,637 | $ 2,217,716 | $ 1,475,721
Net interest income (expense) | 1,604,612 | 1,558,664 | 1,291,283
Credit loss expense | 64,985 | 46,171 | 3,000
Net interest income after credit loss expense | 1,539,627 | 1,512,493 | 1,288,283
Trust and investment management fees | 165,270 | 153,315 | 154,679
Service charges on deposit accounts | 106,230 | 93,504 | 91,891
Insurance commissions and fees | 61,269 | 58,271 | 53,210
Interchange and card transaction fees | 21,017 | 19,419 | 18,231
Other charges, commissions and fees | 53,348 | 49,026 | 41,590
Net gain (loss) on securities transactions | (96) | 66 | 0
Other | 52,060 | 54,941 | 45,217
Total non-interest income | 459,098 | 428,542 | 404,818
Salaries and wages | 621,394 | 547,718 | 492,096
Employee benefits | 122,446 | 115,306 | 88,608
Net occupancy | 128,751 | 124,396 | 112,495
Technology, furniture and equipment | 148,487 | 135,286 | 120,771
Deposit insurance | 37,269 | 76,589 | 15,603
Other | 244,411 | 229,367 | 194,701
Total non-interest expense | 1,302,758 | 1,228,662 | 1,024,274
Income (loss) before income taxes | 695,967 | 712,373 | 668,827
Income tax expense (benefit) | 113,425 | 114,400 | 89,677
Net income (loss) | 582,542 | 597,973 | 579,150
Preferred stock dividends | 6,675 | 6,675 | 6,675
Net income (loss) available to common shareholders | 575,867 | 591,298 | 572,475
Revenues from (expenses to) external customers | 2,063,710 | 1,987,206 | 1,696,101
Average assets (in millions) | 49,694,000 | 49,604,000 | 51,513,000
Banking [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 2,382,675 | 2,209,659 | 1,470,947
Interest expense | 772,075 | 647,218 | 175,480
Net interest income (expense) | 1,610,600 | 1,562,441 | 1,295,467
Credit loss expense | 64,985 | 46,171 | 3,000
Net interest income after credit loss expense | 1,545,615 | 1,516,270 | 1,292,467
Trust and investment management fees | 0 | 0 | 0
Service charges on deposit accounts | 106,217 | 93,478 | 91,851
Insurance commissions and fees | 61,269 | 58,271 | 53,210
Interchange and card transaction fees | 21,017 | 19,419 | 18,231
Other charges, commissions and fees | 30,626 | 30,217 | 24,520
Net gain (loss) on securities transactions | (96) | 66 | 0
Other | 45,790 | 49,868 | 43,064
Total non-interest income | 264,823 | 251,319 | 230,876
Salaries and wages | 544,843 | 480,083 | 430,660
Employee benefits | 109,431 | 103,427 | 78,178
Net occupancy | 115,136 | 109,953 | 98,916
Technology, furniture and equipment | 142,517 | 129,042 | 115,257
Deposit insurance | 37,203 | 76,535 | 15,569
Other | 189,700 | 178,784 | 147,841
Total non-interest expense | 1,138,830 | 1,077,824 | 886,421
Income (loss) before income taxes | 671,608 | 689,765 | 636,922
Income tax expense (benefit) | 110,524 | 111,145 | 85,127
Net income (loss) | 561,084 | 578,620 | 551,795
Preferred stock dividends | 0 | 0 | 0
Net income (loss) available to common shareholders | 561,084 | 578,620 | 551,795
Revenues from (expenses to) external customers | 1,875,423 | 1,813,760 | 1,526,343
Average assets (in millions) | 49,621,000 | 49,536,000 | 51,448,000
Frost Wealth Advisors [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 7,962 | 8,057 | 4,774
Interest expense | 421 | 437 | 129
Net interest income (expense) | 7,541 | 7,620 | 4,645
Credit loss expense | 0 | 0 | 0
Net interest income after credit loss expense | 7,541 | 7,620 | 4,645
Trust and investment management fees | 167,448 | 155,278 | 156,751
Service charges on deposit accounts | 13 | 26 | 40
Insurance commissions and fees | 0 | 0 | 0
Interchange and card transaction fees | 0 | 0 | 0
Other charges, commissions and fees | 22,717 | 18,809 | 17,070
Net gain (loss) on securities transactions | 0 | 0 | 0
Other | 6,011 | 4,793 | 2,013
Total non-interest income | 196,189 | 178,906 | 175,874
Salaries and wages | 74,928 | 66,070 | 59,988
Employee benefits | 12,911 | 11,776 | 10,273
Net occupancy | 13,615 | 14,443 | 13,579
Technology, furniture and equipment | 5,764 | 6,054 | 5,341
Deposit insurance | 66 | 54 | 34
Other | 49,790 | 46,081 | 42,794
Total non-interest expense | 157,074 | 144,478 | 132,009
Income (loss) before income taxes | 46,656 | 42,048 | 48,510
Income tax expense (benefit) | 9,798 | 8,830 | 10,187
Net income (loss) | 36,858 | 33,218 | 38,323
Preferred stock dividends | 0 | 0 | 0
Net income (loss) available to common shareholders | 36,858 | 33,218 | 38,323
Revenues from (expenses to) external customers | 203,730 | 186,526 | 180,519
Average assets (in millions) | 64,000 | 59,000 | 57,000
Non-Banks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 0 | 0 | 0
Interest expense | 13,529 | 11,397 | 8,829
Net interest income (expense) | (13,529) | (11,397) | (8,829)
Credit loss expense | 0 | 0 | 0
Net interest income after credit loss expense | (13,529) | (11,397) | (8,829)
Trust and investment management fees | (2,178) | (1,963) | (2,072)
Service charges on deposit accounts | 0 | 0 | 0
Insurance commissions and fees | 0 | 0 | 0
Interchange and card transaction fees | 0 | 0 | 0
Other charges, commissions and fees | 5 | 0 | 0
Net gain (loss) on securities transactions | 0 | 0 | 0
Other | 259 | 280 | 140
Total non-interest income | (1,914) | (1,683) | (1,932)
Salaries and wages | 1,623 | 1,565 | 1,448
Employee benefits | 104 | 103 | 157
Net occupancy | 0 | 0 | 0
Technology, furniture and equipment | 206 | 190 | 173
Deposit insurance | 0 | 0 | 0
Other | 4,921 | 4,502 | 4,066
Total non-interest expense | 6,854 | 6,360 | 5,844
Income (loss) before income taxes | (22,297) | (19,440) | (16,605)
Income tax expense (benefit) | (6,897) | (5,575) | (5,637)
Net income (loss) | (15,400) | (13,865) | (10,968)
Preferred stock dividends | 6,675 | 6,675 | 6,675
Net income (loss) available to common shareholders | (22,075) | (20,540) | (17,643)
Revenues from (expenses to) external customers | (15,443) | (13,080) | (10,761)
Average assets (in millions) | $ 9,000 | $ 9,000 | $ 8,000

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