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Operating Segments - Summary of Operating Results by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | $ 268,519 | $ 261,791 | $ 554,386 | $ 525,709
Net income | 71,479 | 73,077 | 140,258 | 145,240
Operating Segments [Member] | Banking [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | 237,444 | 230,066 | 492,717 | 461,935
Net income | 68,195 | 69,021 | 134,125 | 136,739
Operating Segments [Member] | Frost Wealth Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | 32,225 | 32,498 | 63,948 | 65,140
Net income | 4,860 | 5,299 | 9,012 | 10,636
Operating Segments [Member] | Non-Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | (1,150) | (773) | (2,279) | (1,366)
Net income | $ (1,576) | $ (1,243) | $ (2,879) | $ (2,135)

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