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Operating Segments (Tables) | 12 Months Ended
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Dec. 31, 2023
Segment Reporting [Abstract] |
Summary of Operating Results by Segment | Financial results by operating segment 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 $47.2 billion, $42.9 billion and $43.3 billion at December 31, 2023, 2022 and 2021.
| Banking |  | Frost Wealth Advisors |  | Non-Banks |  | Consolidated
2023 |  |  |  |  |  |  |
Net interest income (expense) | $ | 1,562,441 |  |  | $ | 7,620 |  |  | $ | (11,397) |  |  | $ | 1,558,664 |
Credit loss expense | 46,171 |  |  | — |  |  | — |  |  | 46,171 |
Non-interest income | 251,319 |  |  | 178,906 |  |  | (1,683) |  |  | 428,542 |
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 |  |  |  |  |  |  |
Net interest income (expense) | $ | 1,295,467 |  |  | $ | 4,645 |  |  | $ | (8,829) |  |  | $ | 1,291,283 |
Credit loss expense | 3,000 |  |  | — |  |  | — |  |  | 3,000 |
Non-interest income | 230,876 |  |  | 175,874 |  |  | (1,932) |  |  | 404,818 |
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 |
2021 |  |  |  |  |  |  |
Net interest income (expense) | $ | 989,870 |  |  | $ | 2,138 |  |  | $ | (7,141) |  |  | $ | 984,867 |
Credit loss expense | 54 |  |  | 9 |  |  | — |  |  | 63 |
Non-interest income | 220,662 |  |  | 167,442 |  |  | (1,376) |  |  | 386,728 |
Non-interest expense | 753,719 |  |  | 122,972 |  |  | 5,303 |  |  | 881,994 |
Income (loss) before income taxes | 456,759 |  |  | 46,599 |  |  | (13,820) |  |  | 489,538 |
Income tax expense (benefit) | 41,483 |  |  | 9,786 |  |  | (4,810) |  |  | 46,459 |
Net income (loss) | 415,276 |  |  | 36,813 |  |  | (9,010) |  |  | 443,079 |
Preferred stock dividends | — |  |  | — |  |  | 7,157 |  |  | 7,157 |
Net income (loss) available to common shareholders | $ | 415,276 |  |  | $ | 36,813 |  |  | $ | (16,167) |  |  | $ | 435,922 |
Revenues from (expenses to) external customers | $ | 1,210,532 |  |  | $ | 169,580 |  |  | $ | (8,517) |  |  | $ | 1,371,595 |
Average assets (in millions) | $ | 45,903 |  |  | $ | 70 |  |  | $ | 10 |  |  | $ | 45,983 |

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