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Operating Segments - Summary of Operating Results by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | $ 270,359 | $ 258,503 | $ 796,068 | $ 745,444
Net income | 75,850 | 77,381 | 221,090 | 205,273
Operating Segments [Member] | Banking [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | 239,145 | 225,829 | 701,080 | 648,638
Net income | 71,402 | 71,329 | 208,141 | 191,491
Operating Segments [Member] | Frost Wealth Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | 31,727 | 32,662 | 96,867 | 96,069
Net income | 4,782 | 5,873 | 15,418 | 16,345
Operating Segments [Member] | Non-Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | (513) | 12 | (1,879) | 737
Net income | $ (334) | $ 179 | $ (2,469) | $ (2,563)

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