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Condensed Financial Statements of Parent Company (Schedule of Condensed Statements of Income) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |
Total interest income | $ 1,021,035 | $ 1,133,785 | $ 1,051,198
Interest expense | 45,034 | 129,780 | 93,306
Other | 166,310 | 180,665 | 173,466
Income before income taxes and equity in undistributed earnings of subsidiaries | 351,321 | 499,469 | 508,681
Income tax benefit | (20,170) | (55,870) | (53,763)
Net income | 331,151 | 443,599 | 454,918
Preferred stock dividends | 2,016 | 8,063 | 8,063
Redemption of preferred stock | 5,514 | 0 | 0
Net income available to common shareholders | 323,621 | 435,536 | 446,855
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividend income paid by Frost Bank | 298,884 | 234,531 | 223,371
Dividend income paid by non-banks | 736 | 1,822 | 953
Interest and other income | 446 | 2,868 | 1,828
Total interest income | 300,066 | 239,221 | 226,152
Interest expense | 8,216 | 10,363 | 9,948
Salaries and employee benefits | 1,581 | 1,551 | 1,973
Other | 6,833 | 7,033 | 7,016
Total expenses | 16,630 | 18,947 | 18,937
Income before income taxes and equity in undistributed earnings of subsidiaries | 283,436 | 220,274 | 207,215
Income tax benefit | 5,406 | 5,135 | 5,218
Equity in undistributed earnings of subsidiaries | 42,309 | 218,190 | 242,485
Net income | 331,151 | 443,599 | 454,918
Preferred stock dividends | 2,016 | 8,063 | 8,063
Redemption of preferred stock | 5,514 | 0 | 0
Net income available to common shareholders | $ 323,621 | $ 435,536 | $ 446,855

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