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Operating Segments - Summary of Operating Results by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Interest Income (Expense), Net | $ 390,051 | $ 399,820
Credit loss expense | 13,650 | 9,104
Total non-interest income | 111,377 | 105,265
Total non-interest expense | 326,217 | 285,142
Income (loss) before income taxes | 161,561 | 210,839
Income tax expense (benefit) | 25,871 | 33,186
Net income (loss) | 135,690 | 177,653
Preferred stock dividends | 1,669 | 1,669
Net income (loss) available to common shareholders | 134,021 | 175,984
Revenues from (expenses to) external customers | 501,428 | 505,085
Bank |  |
Segment Reporting Information [Line Items] |  |
Interest Income (Expense), Net | 391,805 | 401,318
Credit loss expense | 13,650 |
Total non-interest income | 66,380 | 63,643
Total non-interest expense | 286,830 | 249,865
Income (loss) before income taxes | 157,705 | 205,992
Income tax expense (benefit) | 25,635 | 32,366
Net income (loss) | 132,070 | 173,626
Preferred stock dividends | 0 | 0
Net income (loss) available to common shareholders | 132,070 | 173,626
Revenues from (expenses to) external customers | 458,185 | 464,961
Frost Wealth Advisors [Member] |  |
Segment Reporting Information [Line Items] |  |
Interest Income (Expense), Net | 1,669 | 1,654
Credit loss expense | 0 |
Total non-interest income | 45,426 | 42,038
Total non-interest expense | 37,973 | 33,949
Income (loss) before income taxes | 9,122 | 9,743
Income tax expense (benefit) | 1,916 | 2,046
Net income (loss) | 7,206 | 7,697
Preferred stock dividends | 0 | 0
Net income (loss) available to common shareholders | 7,206 | 7,697
Revenues from (expenses to) external customers | 47,095 | 43,692
Non-Banks [Member] |  |
Segment Reporting Information [Line Items] |  |
Interest Income (Expense), Net | (3,423) | (3,152)
Credit loss expense | 0 |
Total non-interest income | (429) | (416)
Total non-interest expense | 1,414 | 1,328
Income (loss) before income taxes | (5,266) | (4,896)
Income tax expense (benefit) | (1,680) | (1,226)
Net income (loss) | (3,586) | (3,670)
Preferred stock dividends | 1,669 | 1,669
Net income (loss) available to common shareholders | (5,255) | (5,339)
Revenues from (expenses to) external customers | $ (3,852) | $ (3,568)

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