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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |
Total interest income | $ 892,947 | $ 788,412 | $ 749,496
Interest expense | 26,525 | 12,076 | 12,864
Salaries and employee benefits | 337,068 | 318,665 | 310,504
Other | 175,289 | 178,988 | 165,561
Income before income taxes and equity in undistributed earnings of subsidiaries | 408,363 | 341,411 | 319,799
Income tax benefit | (44,214) | (37,150) | (40,471)
Net income | 364,149 | 304,261 | 279,328
Preferred stock dividends | 8,063 | 8,063 | 8,063
Net income available to common shareholders | 356,086 | 296,198 | 271,265
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividend income paid by Frost Bank | 149,671 | 141,377 | 126,375
Dividend income paid by non-banks | 915 | 895 | 1,830
Interest and other income | 421 | 33 | 82
Total interest income | 151,007 | 142,305 | 128,287
Interest expense | 7,815 | 4,624 | 3,673
Salaries and employee benefits | 1,202 | 1,828 | 1,376
Other | 6,373 | 5,933 | 5,727
Total expenses | 15,390 | 12,385 | 10,776
Income before income taxes and equity in undistributed earnings of subsidiaries | 135,617 | 129,920 | 117,511
Income tax benefit | 7,092 | 7,015 | 6,062
Equity in undistributed earnings of subsidiaries | 221,440 | 167,326 | 155,755
Net income | 364,149 | 304,261 | 279,328
Preferred stock dividends | 8,063 | 8,063 | 8,063
Net income available to common shareholders | $ 356,086 | $ 296,198 | $ 271,265

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