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Operating Segments (Tables)
12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Summary of Operating Results by Segment
Financial results by operating segment are detailed below. Certain prior period amounts have been reclassified to conform to the current presentation. Frost Wealth Advisors excludes off-balance-sheet managed and custody assets with a total fair value of $38.6 billion, $37.8 billion and $33.3 billion at December 31, 2020, 2019 and 2018.
BankingFrost
Wealth
Advisors
Non-BanksConsolidated
2020
Net interest income (expense)$981,441 $2,776 $(8,216)$976,001 
Credit loss expense241,230 — — 241,230 
Non-interest income321,136 145,268 (950)465,454 
Non-interest expense718,519 123,630 6,755 848,904 
Income (loss) before income taxes342,828 24,414 (15,921)351,321 
Income tax expense (benefit)20,347 5,127 (5,304)20,170 
Net income (loss)322,481 19,287 (10,617)331,151 
Preferred stock dividends— — 2,016 2,016 
Redemption of preferred stock— — 5,514 5,514 
Net income (loss) available to common shareholders$322,481 $19,287 $(18,147)$323,621 
Revenues from (expenses to) external customers$1,302,577 $148,044 $(9,166)$1,441,455 
Average assets (in millions)$37,892 $59 $10 $37,961 
BankingFrost
Wealth
Advisors
Non-BanksConsolidated
2019
Net interest income (expense)$1,010,368 $4,001 $(10,364)$1,004,005 
Credit loss expense33,758 — 33,759 
Non-interest income218,447 145,905 (450)363,902 
Non-interest expense703,121 124,622 6,936 834,679 
Income (loss) before income taxes491,936 25,283 (17,750)499,469 
Income tax expense (benefit)55,520 5,308 (4,958)55,870 
Net income (loss)436,416 19,975 (12,792)443,599 
Preferred stock dividends— — 8,063 8,063 
Net income (loss) available to common shareholders$436,416 $19,975 $(20,855)$435,536 
Revenues from (expenses to) external customers$1,228,815 $149,906 $(10,814)$1,367,907 
Average assets (in millions)$32,019 $56 $11 $32,086 
2018
Net interest income (expense)$963,757 $4,083 $(9,948)$957,892 
Credit loss expense21,685 — — 21,685 
Non-interest income213,763 138,045 (522)351,286 
Non-interest expense657,376 114,166 7,270 778,812 
Income (loss) before income taxes498,459 27,962 (17,740)508,681 
Income tax expense (benefit)52,928 5,872 (5,037)53,763 
Net income (loss)445,531 22,090 (12,703)454,918 
Preferred stock dividends— — 8,063 8,063 
Net income (loss) available to common shareholders$445,531 $22,090 $(20,766)$446,855 
Revenues from (expenses to) external customers$1,177,520 $142,128 $(10,470)$1,309,178 
Average assets (in millions)$30,964 $54 $12 $31,030