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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |
Total interest income | $ 788,412 | $ 749,496 | $ 701,471
Interest expense | 12,076 | 12,864 | 14,537
Salaries and employee benefits | 318,665 | 310,504 | 292,349
Other | 178,988 | 165,561 | 167,656
Income before income taxes and equity in undistributed earnings of subsidiaries | 341,411 | 319,799 | 336,024
Income tax benefit | (37,150) | (40,471) | (58,047)
Net income | 304,261 | 279,328 | 277,977
Preferred stock dividends | 8,063 | 8,063 | 8,063
Net income available to common shareholders | 296,198 | 271,265 | 269,914
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividend income paid by Frost Bank | 141,377 | 126,375 | 114,439
Dividend income paid by non-banks | 895 | 1,830 | 4,323
Interest and other income | 33 | 82 | 69
Total interest income | 142,305 | 128,287 | 118,831
Interest expense | 4,624 | 3,673 | 3,381
Salaries and employee benefits | 1,828 | 1,376 | 1,218
Other | 5,933 | 5,727 | 8,526
Total expenses | 12,385 | 10,776 | 13,125
Income before income taxes and equity in undistributed earnings of subsidiaries | 129,920 | 117,511 | 105,706
Income tax benefit | 7,015 | 6,062 | 6,702
Equity in undistributed earnings of subsidiaries | 167,326 | 155,755 | 165,569
Net income | 304,261 | 279,328 | 277,977
Preferred stock dividends | 8,063 | 8,063 | 8,063
Net income available to common shareholders | $ 296,198 | $ 271,265 | $ 269,914

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