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Operating Segments (Summary of Operating Results by Segment) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | $ 1,004,005 | $ 957,892 | $ 866,422
Provision for loan losses | 33,759 | 21,613 | 35,460
Non-interest income | 363,902 | 351,286 | 336,470
Non-interest expense | 834,679 | 778,884 | 759,069
Income before income taxes | 499,469 | 508,681 | 408,363
Income tax expense (benefit) | 55,870 | 53,763 | 44,214
Net income | 443,599 | 454,918 | 364,149
Preferred stock dividends | 8,063 | 8,063 | 8,063
Net income available to common shareholders | 435,536 | 446,855 | 356,086
Revenues from (expenses to) external customers | 1,367,907 | 1,309,178 | 1,202,892
Average assets | 32,086,000 | 31,030,000 | 30,450,000
Banking [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | 1,010,368 | 963,757 | 856,593
Provision for loan losses | 33,758 | 21,613 | 35,460
Non-interest income | 218,447 | 213,763 | 207,810
Non-interest expense | 703,121 | 657,448 | 644,072
Income before income taxes | 491,936 | 498,459 | 384,871
Income tax expense (benefit) | 55,520 | 52,928 | 37,837
Net income | 436,416 | 445,531 | 347,034
Preferred stock dividends | 0 | 0 | 0
Net income available to common shareholders | 436,416 | 445,531 | 347,034
Revenues from (expenses to) external customers | 1,228,815 | 1,177,520 | 1,064,403
Average assets | 32,019,000 | 30,964,000 | 30,391,000
Frost Wealth Advisors [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | 4,001 | 4,083 | 17,644
Provision for loan losses | 1 | 0 | 0
Non-interest income | 145,905 | 138,045 | 128,819
Non-interest expense | 124,622 | 114,166 | 108,931
Income before income taxes | 25,283 | 27,962 | 37,532
Income tax expense (benefit) | 5,308 | 5,872 | 13,137
Net income | 19,975 | 22,090 | 24,395
Preferred stock dividends | 0 | 0 | 0
Net income available to common shareholders | 19,975 | 22,090 | 24,395
Revenues from (expenses to) external customers | 149,906 | 142,128 | 146,463
Average assets | 56,000 | 54,000 | 43,000
Non-Banks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | (10,364) | (9,948) | (7,815)
Provision for loan losses | 0 | 0 | 0
Non-interest income | (450) | (522) | (159)
Non-interest expense | 6,936 | 7,270 | 6,066
Income before income taxes | (17,750) | (17,740) | (14,040)
Income tax expense (benefit) | (4,958) | (5,037) | (6,760)
Net income | (12,792) | (12,703) | (7,280)
Preferred stock dividends | 8,063 | 8,063 | 8,063
Net income available to common shareholders | (20,855) | (20,766) | (15,343)
Revenues from (expenses to) external customers | (10,814) | (10,470) | (7,974)
Average assets | $ 11,000 | $ 12,000 | $ 16,000

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