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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items] |  |  |
Total income | $ 1,475,721 | $ 1,008,769 | $ 1,021,035
Interest expense | 184,438 | 23,902 | 45,034
Other | 194,221 | 171,457 | 166,310
Income before income taxes and equity in undistributed earnings of subsidiaries | 668,827 | 489,538 | 351,321
Income tax benefit | (89,677) | (46,459) | (20,170)
Net income | 579,150 | 443,079 | 331,151
Preferred stock dividends | 6,675 | 7,157 | 2,016
Redemption of preferred stock | 0 | 0 | 5,514
Net income available to common shareholders | 572,475 | 435,922 | 323,621
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividend income paid by Frost Bank | 51,711 | 219,386 | 298,884
Dividend income paid by non-banks | 109 | 473 | 736
Interest and other income | 0 | 101 | 446
Total income | 51,820 | 219,960 | 300,066
Interest expense | 8,829 | 7,141 | 8,216
Salaries and employee benefits | 1,605 | 1,499 | 1,581
Other | 6,316 | 5,867 | 6,833
Total expenses | 16,750 | 14,507 | 16,630
Income before income taxes and equity in undistributed earnings of subsidiaries | 35,070 | 205,453 | 283,436
Income tax benefit | 5,641 | 4,899 | 5,406
Equity in undistributed earnings of subsidiaries | 538,439 | 232,727 | 42,309
Net income | 579,150 | 443,079 | 331,151
Preferred stock dividends | 6,675 | 7,157 | 2,016
Redemption of preferred stock | 0 | 0 | 5,514
Net income available to common shareholders | $ 572,475 | $ 435,922 | $ 323,621

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