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Operating Segments - Summary of Operating Results by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Revenues from (expenses to) external customers | $ 292,209 | $ 285,867
Net income | 84,941 | 68,816
Operating Segments [Member] | Banking [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues from (expenses to) external customers | 258,911 | 255,273
Net income | 80,869 | 65,967
Operating Segments [Member] | Frost Wealth Advisors [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues from (expenses to) external customers | 34,588 | 31,723
Net income | 5,294 | 4,152
Operating Segments [Member] | Non-Banks [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues from (expenses to) external customers | (1,290) | (1,129)
Net income | $ (1,222) | $ (1,303)

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