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Operating Segments (Tables) | 12 Months Ended
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Dec. 31, 2021
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 $43.3 billion, $38.6 billion and $37.8 billion at December 31, 2021, 2020 and 2019.
| Banking |  | Frost Wealth Advisors |  | Non-Banks |  | Consolidated
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 |
| Banking |  | Frost Wealth Advisors |  | Non-Banks |  | Consolidated
2020 |  |  |  |  |  |  |
Net interest income (expense) | $ | 981,441 |  |  | $ | 2,776 |  |  | $ | (8,216) |  |  | $ | 976,001 |
Credit loss expense | 241,230 |  |  | — |  |  | — |  |  | 241,230 |
Non-interest income | 321,136 |  |  | 145,268 |  |  | (950) |  |  | 465,454 |
Non-interest expense | 718,519 |  |  | 123,630 |  |  | 6,755 |  |  | 848,904 |
Income (loss) before income taxes | 342,828 |  |  | 24,414 |  |  | (15,921) |  |  | 351,321 |
Income tax expense (benefit) | 20,347 |  |  | 5,127 |  |  | (5,304) |  |  | 20,170 |
Net income (loss) | 322,481 |  |  | 19,287 |  |  | (10,617) |  |  | 331,151 |
Preferred stock dividends | — |  |  | — |  |  | 2,016 |  |  | 2,016 |
Redemption of preferred stock | — |  |  | — |  |  | 5,514 |  |  | 5,514 |
Net income (loss) available to common shareholders | $ | 322,481 |  |  | $ | 19,287 |  |  | $ | (18,147) |  |  | $ | 323,621 |
Revenues from (expenses to) external customers | $ | 1,302,577 |  |  | $ | 148,044 |  |  | $ | (9,166) |  |  | $ | 1,441,455 |
Average assets (in millions) | $ | 37,892 |  |  | $ | 59 |  |  | $ | 10 |  |  | $ | 37,961 |
2019 |  |  |  |  |  |  |
Net interest income (expense) | $ | 1,010,368 |  |  | $ | 4,001 |  |  | $ | (10,364) |  |  | $ | 1,004,005 |
Credit loss expense | 33,758 |  |  | 1 |  |  | — |  |  | 33,759 |
Non-interest income | 218,447 |  |  | 145,905 |  |  | (450) |  |  | 363,902 |
Non-interest expense | 703,121 |  |  | 124,622 |  |  | 6,936 |  |  | 834,679 |
Income (loss) before income taxes | 491,936 |  |  | 25,283 |  |  | (17,750) |  |  | 499,469 |
Income tax expense (benefit) | 55,520 |  |  | 5,308 |  |  | (4,958) |  |  | 55,870 |
Net income (loss) | 436,416 |  |  | 19,975 |  |  | (12,792) |  |  | 443,599 |
Preferred stock dividends | — |  |  | — |  |  | 8,063 |  |  | 8,063 |
Net income (loss) available to common shareholders | $ | 436,416 |  |  | $ | 19,975 |  |  | $ | (20,855) |  |  | $ | 435,536 |
Revenues from (expenses to) external customers | $ | 1,228,815 |  |  | $ | 149,906 |  |  | $ | (10,814) |  |  | $ | 1,367,907 |
Average assets (in millions) | $ | 32,019 |  |  | $ | 56 |  |  | $ | 11 |  |  | $ | 32,086 |

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