v3.22.4
Condensed Financial Statements of Parent Company (Schedule of Condensed Statements of Income) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]      
Total income $ 1,475,721 $ 1,008,769 $ 1,021,035
Interest expense 184,438 23,902 45,034
Other 194,221 171,457 166,310
Income before income taxes and equity in undistributed earnings of subsidiaries 668,827 489,538 351,321
Income tax benefit (89,677) (46,459) (20,170)
Net income 579,150 443,079 331,151
Preferred stock dividends 6,675 7,157 2,016
Redemption of preferred stock 0 0 5,514
Net income available to common shareholders 572,475 435,922 323,621
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Dividend income paid by Frost Bank 51,711 219,386 298,884
Dividend income paid by non-banks 109 473 736
Interest and other income 0 101 446
Total income 51,820 219,960 300,066
Interest expense 8,829 7,141 8,216
Salaries and employee benefits 1,605 1,499 1,581
Other 6,316 5,867 6,833
Total expenses 16,750 14,507 16,630
Income before income taxes and equity in undistributed earnings of subsidiaries 35,070 205,453 283,436
Income tax benefit 5,641 4,899 5,406
Equity in undistributed earnings of subsidiaries 538,439 232,727 42,309
Net income 579,150 443,079 331,151
Preferred stock dividends 6,675 7,157 2,016
Redemption of preferred stock 0 0 5,514
Net income available to common shareholders $ 572,475 $ 435,922 $ 323,621