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Operating Segments - Summary of Operating Results by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | $ 276,621 | $ 270,359 | $ 831,007 | $ 796,068
Net income | 80,219 | 75,850 | 220,542 | 221,090
Operating Segments [Member] | Banking [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | 244,343 | 239,145 | 737,060 | 701,080
Net income | 76,347 | 71,402 | 210,454 | 208,141
Operating Segments [Member] | Frost Wealth Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | 33,536 | 31,727 | 97,484 | 96,867
Net income | 4,797 | 4,782 | 13,809 | 15,418
Operating Segments [Member] | Non-Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | (1,258) | (513) | (3,537) | (1,879)
Net income | $ (925) | $ (334) | $ (3,721) | $ (2,469)

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