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Operating Segments (Tables) | 12 Months Ended
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Dec. 31, 2024
Segment Reporting [Abstract] |
Summary of Operating Results by Segment | Financial results by operating segment, including significant expense categories provided to the chief operating decision maker, are detailed below. Certain prior period amounts have been reclassified to conform to the current presentation. Frost Wealth Advisors excludes off-balance-sheet managed and custody assets with a total fair value of $51.4 billion, $47.2 billion and $42.9 billion at December 31, 2024, 2023 and 2022.
| Banking |  | Frost Wealth Advisors |  | Non-Banks |  | Consolidated
2024 |  |  |  |  |  |  |
Interest income | $ | 2,382,675 |  |  | $ | 7,962 |  |  | $ | — |  |  | $ | 2,390,637 |
Interest expense | 772,075 |  |  | 421 |  |  | 13,529 |  |  | 786,025 |
Net interest income (expense) | 1,610,600 |  |  | 7,541 |  |  | (13,529) |  |  | 1,604,612 |
Credit loss expense | 64,985 |  |  | — |  |  | — |  |  | 64,985 |
Net interest income after credit loss expense | 1,545,615 |  |  | 7,541 |  |  | (13,529) |  |  | 1,539,627 |
Non-interest income: |  |  |  |  |  |  |
Trust and investment management fees | — |  |  | 167,448 |  |  | (2,178) |  |  | 165,270 |
Service charges on deposit accounts | 106,217 |  |  | 13 |  |  | — |  |  | 106,230 |
Insurance commissions and fees | 61,269 |  |  | — |  |  | — |  |  | 61,269 |
Interchange and card transaction fees | 21,017 |  |  | — |  |  | — |  |  | 21,017 |
Other charges, commissions and fees | 30,626 |  |  | 22,717 |  |  | 5 |  |  | 53,348 |
Net gain (loss) on securities transactions | (96) |  |  | — |  |  | — |  |  | (96) |
Other | 45,790 |  |  | 6,011 |  |  | 259 |  |  | 52,060 |
Total non-interest income | 264,823 |  |  | 196,189 |  |  | (1,914) |  |  | 459,098 |
Non-interest expense: |  |  |  |  |  |  |
Salaries and wages | 544,843 |  |  | 74,928 |  |  | 1,623 |  |  | 621,394 |
Employee benefits | 109,431 |  |  | 12,911 |  |  | 104 |  |  | 122,446 |
Net occupancy | 115,136 |  |  | 13,615 |  |  | — |  |  | 128,751 |
Technology, furniture and equipment | 142,517 |  |  | 5,764 |  |  | 206 |  |  | 148,487 |
Deposit insurance | 37,203 |  |  | 66 |  |  | — |  |  | 37,269 |
Other | 189,700 |  |  | 49,790 |  |  | 4,921 |  |  | 244,411 |
Total non-interest expense | 1,138,830 |  |  | 157,074 |  |  | 6,854 |  |  | 1,302,758 |
Income (loss) before income taxes | 671,608 |  |  | 46,656 |  |  | (22,297) |  |  | 695,967 |
Income tax expense (benefit) | 110,524 |  |  | 9,798 |  |  | (6,897) |  |  | 113,425 |
Net income (loss) | 561,084 |  |  | 36,858 |  |  | (15,400) |  |  | 582,542 |
Preferred stock dividends | — |  |  | — |  |  | 6,675 |  |  | 6,675 |
Net income (loss) available to common shareholders | $ | 561,084 |  |  | $ | 36,858 |  |  | $ | (22,075) |  |  | $ | 575,867 |
Revenues from (expenses to) external customers | $ | 1,875,423 |  |  | $ | 203,730 |  |  | $ | (15,443) |  |  | $ | 2,063,710 |
Average assets (in millions) | $ | 49,621 |  |  | $ | 64 |  |  | $ | 9 |  |  | $ | 49,694 |
| Banking |  | Frost Wealth Advisors |  | Non-Banks |  | Consolidated
2023 |  |  |  |  |  |  |
Interest income | $ | 2,209,659 |  |  | $ | 8,057 |  |  | $ | — |  |  | $ | 2,217,716 |
Interest expense | 647,218 |  |  | 437 |  |  | 11,397 |  |  | 659,052 |
Net interest income (expense) | 1,562,441 |  |  | 7,620 |  |  | (11,397) |  |  | 1,558,664 |
Credit loss expense | 46,171 |  |  | — |  |  | — |  |  | 46,171 |
Net interest income after credit loss expense | 1,516,270 |  |  | 7,620 |  |  | (11,397) |  |  | 1,512,493 |
Non-interest income: |  |  |  |  |  |  |
Trust and investment management fees | — |  |  | 155,278 |  |  | (1,963) |  |  | 153,315 |
Service charges on deposit accounts | 93,478 |  |  | 26 |  |  | — |  |  | 93,504 |
Insurance commissions and fees | 58,271 |  |  | — |  |  | — |  |  | 58,271 |
Interchange and card transaction fees | 19,419 |  |  | — |  |  | — |  |  | 19,419 |
Other charges, commissions and fees | 30,217 |  |  | 18,809 |  |  | — |  |  | 49,026 |
Net gain (loss) on securities transactions | 66 |  |  | — |  |  | — |  |  | 66 |
Other | 49,868 |  |  | 4,793 |  |  | 280 |  |  | 54,941 |
Total non-interest income | 251,319 |  |  | 178,906 |  |  | (1,683) |  |  | 428,542 |
Non-interest expense: |  |  |  |  |  |  |
Salaries and wages | 480,083 |  |  | 66,070 |  |  | 1,565 |  |  | 547,718 |
Employee benefits | 103,427 |  |  | 11,776 |  |  | 103 |  |  | 115,306 |
Net occupancy | 109,953 |  |  | 14,443 |  |  | — |  |  | 124,396 |
Technology, furniture and equipment | 129,042 |  |  | 6,054 |  |  | 190 |  |  | 135,286 |
Deposit insurance | 76,535 |  |  | 54 |  |  | — |  |  | 76,589 |
Other | 178,784 |  |  | 46,081 |  |  | 4,502 |  |  | 229,367 |
Total non-interest expense | 1,077,824 |  |  | 144,478 |  |  | 6,360 |  |  | 1,228,662 |
Income (loss) before income taxes | 689,765 |  |  | 42,048 |  |  | (19,440) |  |  | 712,373 |
Income tax expense (benefit) | 111,145 |  |  | 8,830 |  |  | (5,575) |  |  | 114,400 |
Net income (loss) | 578,620 |  |  | 33,218 |  |  | (13,865) |  |  | 597,973 |
Preferred stock dividends | — |  |  | — |  |  | 6,675 |  |  | 6,675 |
Net income (loss) available to common shareholders | $ | 578,620 |  |  | $ | 33,218 |  |  | $ | (20,540) |  |  | $ | 591,298 |
Revenues from (expenses to) external customers | $ | 1,813,760 |  |  | $ | 186,526 |  |  | $ | (13,080) |  |  | $ | 1,987,206 |
Average assets (in millions) | $ | 49,536 |  |  | $ | 59 |  |  | $ | 9 |  |  | $ | 49,604 |
| Banking |  | Frost Wealth Advisors |  | Non-Banks |  | Consolidated
2022 |  |  |  |  |  |  |
Interest income | $ | 1,470,947 |  |  | $ | 4,774 |  |  | $ | — |  |  | $ | 1,475,721 |
Interest expense | 175,480 |  |  | 129 |  |  | 8,829 |  |  | 184,438 |
Net interest income (expense) | 1,295,467 |  |  | 4,645 |  |  | (8,829) |  |  | 1,291,283 |
Credit loss expense | 3,000 |  |  | — |  |  | — |  |  | 3,000 |
Net interest income after credit loss expense | 1,292,467 |  |  | 4,645 |  |  | (8,829) |  |  | 1,288,283 |
Non-interest income: |  |  |  |  |  |  |
Trust and investment management fees | — |  |  | 156,751 |  |  | (2,072) |  |  | 154,679 |
Service charges on deposit accounts | 91,851 |  |  | 40 |  |  | — |  |  | 91,891 |
Insurance commissions and fees | 53,210 |  |  | — |  |  | — |  |  | 53,210 |
Interchange and card transaction fees | 18,231 |  |  | — |  |  | — |  |  | 18,231 |
Other charges, commissions and fees | 24,520 |  |  | 17,070 |  |  | — |  |  | 41,590 |
Net gain (loss) on securities transactions | — |  |  | — |  |  | — |  |  | — |
Other | 43,064 |  |  | 2,013 |  |  | 140 |  |  | 45,217 |
Total non-interest income | 230,876 |  |  | 175,874 |  |  | (1,932) |  |  | 404,818 |
Non-interest expense: |  |  |  |  |  |  |
Salaries and wages | 430,660 |  |  | 59,988 |  |  | 1,448 |  |  | 492,096 |
Employee benefits | 78,178 |  |  | 10,273 |  |  | 157 |  |  | 88,608 |
Net occupancy | 98,916 |  |  | 13,579 |  |  | — |  |  | 112,495 |
Technology, furniture and equipment | 115,257 |  |  | 5,341 |  |  | 173 |  |  | 120,771 |
Deposit insurance | 15,569 |  |  | 34 |  |  | — |  |  | 15,603 |
Other | 147,841 |  |  | 42,794 |  |  | 4,066 |  |  | 194,701 |
Total non-interest expense | 886,421 |  |  | 132,009 |  |  | 5,844 |  |  | 1,024,274 |
Income (loss) before income taxes | 636,922 |  |  | 48,510 |  |  | (16,605) |  |  | 668,827 |
Income tax expense (benefit) | 85,127 |  |  | 10,187 |  |  | (5,637) |  |  | 89,677 |
Net income (loss) | 551,795 |  |  | 38,323 |  |  | (10,968) |  |  | 579,150 |
Preferred stock dividends | — |  |  | — |  |  | 6,675 |  |  | 6,675 |
Net income (loss) available to common shareholders | $ | 551,795 |  |  | $ | 38,323 |  |  | $ | (17,643) |  |  | $ | 572,475 |
Revenues from (expenses to) external customers | $ | 1,526,343 |  |  | $ | 180,519 |  |  | $ | (10,761) |  |  | $ | 1,696,101 |
Average assets (in millions) | $ | 51,448 |  |  | $ | 57 |  |  | $ | 8 |  |  | $ | 51,513 |

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