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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest income | $ 2,390,637 | $ 2,217,716 | $ 1,475,721
Other | 244,411 | 229,367 | 194,701
Income before income taxes and equity in undistributed earnings of subsidiaries | 695,967 | 712,373 | 668,827
Income tax 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
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividend income paid by Frost Bank | 262,214 | 279,679 | 51,711
Dividend income paid by non-banks | 268 | 255 | 109
Interest and other income | 0 | 1,929 | 0
Interest income | 262,482 | 281,863 | 51,820
Interest expense | 13,529 | 13,304 | 8,829
Salaries and employee benefits | 1,727 | 1,668 | 1,605
Other | 7,304 | 6,653 | 6,316
Total expenses | 22,560 | 21,625 | 16,750
Income before income taxes and equity in undistributed earnings of subsidiaries | 239,922 | 260,238 | 35,070
Income tax benefit | 6,896 | 5,974 | 5,641
Equity in undistributed earnings of subsidiaries | 335,724 | 331,761 | 538,439
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

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