Operating Segments (Tables)

12 Months Ended

Dec. 31, 2019

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 $37.8 billion, $33.3 billion and $32.8 billion at December 31, 2019, 2018 and 2017.

	Banking		Frost Wealth Advisors		Non-Banks			Consolidated
2019
Net interest income (expense)	$	1,010,368	$	4,001	$	(10,364	)	$	1,004,005
Provision for loan losses	33,758		1		—			33,759
Non-interest income	218,447		145,905		(450		)	363,902
Non-interest expense	703,121		124,622		6,936			834,679
Income (loss) before income taxes	491,936		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

	Banking		Frost Wealth Advisors		Non-Banks			Consolidated
2018
Net interest income (expense)	$	963,757	$	4,083	$	(9,948	)	$	957,892
Provision for loan losses	21,613		—		—			21,613
Non-interest income	213,763		138,045		(522		)	351,286
Non-interest expense	657,448		114,166		7,270			778,884
Income (loss) before income taxes	498,459		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
2017
Net interest income (expense)	$	856,593	$	17,644	$	(7,815	)	$	866,422
Provision for loan losses	35,460		—		—			35,460
Non-interest income	207,810		128,819		(159		)	336,470
Non-interest expense	644,072		108,931		6,066			759,069
Income (loss) before income taxes	384,871		37,532		(14,040		)	408,363
Income tax expense (benefit)	37,837		13,137		(6,760		)	44,214
Net income (loss)	347,034		24,395		(7,280		)	364,149
Preferred stock dividends	—		—		8,063			8,063
Net income (loss) available to common shareholders	$	347,034	$	24,395	$	(15,343	)	$	356,086
Revenues from (expenses to) external customers	$	1,064,403	$	146,463	$	(7,974	)	$	1,202,892
Average assets (in millions)	$	30,391	$	43	$	16		$	30,450