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v3.22.0.1

Operating Segments (Summary of Operating Results by Segment) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | $ 984,867 | $ 976,001 | $ 1,004,005
Credit loss expense | 63 | 241,230 | 33,759
Non-interest income | 386,728 | 465,454 | 363,902
Non-interest expense | 881,994 | 848,904 | 834,679
Income before income taxes | 489,538 | 351,321 | 499,469
Income tax expense (benefit) | 46,459 | 20,170 | 55,870
Net income | 443,079 | 331,151 | 443,599
Preferred stock dividends | 7,157 | 2,016 | 8,063
Redemption of preferred stock | 0 | 5,514 | 0
Net income available to common shareholders | 435,922 | 323,621 | 435,536
Revenues from (expenses to) external customers | 1,371,595 | 1,441,455 | 1,367,907
Average assets | 45,983,000 | 37,961,000 | 32,086,000
Banking [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | 989,870 | 981,441 | 1,010,368
Credit loss expense | 54 | 241,230 | 33,758
Non-interest income | 220,662 | 321,136 | 218,447
Non-interest expense | 753,719 | 718,519 | 703,121
Income before income taxes | 456,759 | 342,828 | 491,936
Income tax expense (benefit) | 41,483 | 20,347 | 55,520
Net income | 415,276 | 322,481 | 436,416
Preferred stock dividends | 0 | 0 | 0
Redemption of preferred stock |  | 0 |
Net income available to common shareholders | 415,276 | 322,481 | 436,416
Revenues from (expenses to) external customers | 1,210,532 | 1,302,577 | 1,228,815
Average assets | 45,903,000 | 37,892,000 | 32,019,000
Frost Wealth Advisors [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | 2,138 | 2,776 | 4,001
Credit loss expense | 9 | 0 | 1
Non-interest income | 167,442 | 145,268 | 145,905
Non-interest expense | 122,972 | 123,630 | 124,622
Income before income taxes | 46,599 | 24,414 | 25,283
Income tax expense (benefit) | 9,786 | 5,127 | 5,308
Net income | 36,813 | 19,287 | 19,975
Preferred stock dividends | 0 | 0 | 0
Redemption of preferred stock |  | 0 |
Net income available to common shareholders | 36,813 | 19,287 | 19,975
Revenues from (expenses to) external customers | 169,580 | 148,044 | 149,906
Average assets | 70,000 | 59,000 | 56,000
Non-Banks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (expense) | (7,141) | (8,216) | (10,364)
Credit loss expense | 0 | 0 | 0
Non-interest income | (1,376) | (950) | (450)
Non-interest expense | 5,303 | 6,755 | 6,936
Income before income taxes | (13,820) | (15,921) | (17,750)
Income tax expense (benefit) | (4,810) | (5,304) | (4,958)
Net income | (9,010) | (10,617) | (12,792)
Preferred stock dividends | 7,157 | 2,016 | 8,063
Redemption of preferred stock |  | 5,514 |
Net income available to common shareholders | (16,167) | (18,147) | (20,855)
Revenues from (expenses to) external customers | (8,517) | (9,166) | (10,814)
Average assets | $ 10,000 | $ 10,000 | $ 11,000

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