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Operating Segments (Tables)
3 Months Ended
Mar. 31, 2022
Segment Reporting [Abstract]  
Summary of Operating Results by Segment Summarized operating results by segment were as follows:
BankingFrost  Wealth
Advisors
Non-BanksConsolidated
Three months ended:
March 31, 2022
Net interest income (expense)$250,119 $700 $(1,748)$249,071 
Credit loss expense (benefit)(1)— — 
Non-interest income58,706 43,229 (545)101,390 
Non-interest expense206,538 30,910 1,284 238,732 
Income (loss) before income taxes102,288 13,018 (3,577)111,729 
Income tax expense (benefit)11,014 2,734 (1,121)12,627 
Net income (loss)91,274 10,284 (2,456)99,102 
Preferred stock dividends— — 1,669 1,669 
Net income (loss) available to common shareholders$91,274 $10,284 $(4,125)$97,433 
Revenues from (expenses to) external customers$308,825 $43,929 $(2,293)$350,461 
March 31, 2021
Net interest income (expense)$242,205 $486 $(1,810)$240,881 
Credit loss expense63 — — 63 
Non-interest income53,780 39,609 (153)93,236 
Non-interest expense179,151 29,937 1,054 210,142 
Income (loss) before income taxes116,771 10,158 (3,017)123,912 
Income tax expense (benefit)7,177 2,133 (1,413)7,897 
Net income (loss)109,594 8,025 (1,604)116,015 
Preferred stock dividends— — 2,151 2,151 
Net income (loss) available to common shareholders$109,594 $8,025 $(3,755)$113,864 
Revenues from (expenses to) external customers$295,985 $40,095 $(1,963)$334,117