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Operating Segments - Summary of Operating Results by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | $ 342,231 | $ 329,322 | $ 1,021,554 | $ 972,851
Net income | 111,836 | 117,844 | 339,918 | 335,665
Operating Segments [Member] | Banking [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | 307,312 | 295,062 | 918,672 | 874,056
Net income | 110,583 | 114,214 | 334,393 | 327,131
Operating Segments [Member] | Frost Wealth Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | 37,549 | 36,868 | 111,064 | 106,475
Net income | 4,106 | 6,442 | 15,403 | 17,977
Operating Segments [Member] | Non-Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from (expenses to) external customers | (2,630) | (2,608) | (8,182) | (7,680)
Net income | $ (2,853) | $ (2,812) | $ (9,878) | $ (9,443)

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