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Condensed Financial Statements of Parent Company (Schedule of Condensed Statements of Income) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items] |  |  |
Total income | $ 2,217,716 | $ 1,475,721 | $ 1,008,769
Interest expense | 659,052 | 184,438 | 23,902
Other | 229,367 | 194,701 | 172,154
Income before income taxes and equity in undistributed earnings of subsidiaries | 712,373 | 668,827 | 489,538
Income tax benefit | (114,400) | (89,677) | (46,459)
Net income | 597,973 | 579,150 | 443,079
Preferred stock dividends | 6,675 | 6,675 | 7,157
Net income available to common shareholders | 591,298 | 572,475 | 435,922
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividend income paid by Frost Bank | 279,679 | 51,711 | 219,386
Dividend income paid by non-banks | 255 | 109 | 473
Interest and other income | 1,929 | 0 | 101
Total income | 281,863 | 51,820 | 219,960
Interest expense | 13,304 | 8,829 | 7,141
Salaries and employee benefits | 1,668 | 1,605 | 1,499
Other | 6,653 | 6,316 | 5,867
Total expenses | 21,625 | 16,750 | 14,507
Income before income taxes and equity in undistributed earnings of subsidiaries | 260,238 | 35,070 | 205,453
Income tax benefit | 5,974 | 5,641 | 4,899
Equity in undistributed earnings of subsidiaries | 331,761 | 538,439 | 232,727
Net income | 597,973 | 579,150 | 443,079
Preferred stock dividends | 6,675 | 6,675 | 7,157
Net income available to common shareholders | $ 591,298 | $ 572,475 | $ 435,922

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