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Operating Segments - Summary of Operating Results by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Revenues from (expenses to) external customers | $ 285,867 | $ 263,918
Net income | 68,779 | 72,163
Operating Segments [Member] | Banking [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues from (expenses to) external customers | 255,273 | 231,869
Net income | 65,930 | 67,718
Operating Segments [Member] | Frost Wealth Advisors [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues from (expenses to) external customers | 31,723 | 32,642
Net income | 4,152 | 5,337
Operating Segments [Member] | Non-Banks [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues from (expenses to) external customers | (1,129) | (593)
Net income | $ (1,303) | $ (892)

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