Operating Segments (Tables)

12 Months Ended

Dec. 31, 2018

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 $33.3 billion, $32.8 billion and $29.3 billion at December 31, 2018, 2017 and 2016.

	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

	Banking		Frost Wealth Advisors		Non-Banks			Consolidated
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
2016
Net interest income (expense)	$	769,625	$	11,335	$	(4,624	)	$	776,336
Provision for loan losses	51,672		1		—			51,673
Non-interest income	229,791		120,102		(185		)	349,708
Non-interest expense	624,396		102,062		6,502			732,960
Income (loss) before income taxes	323,348		29,374		(11,311		)	341,411
Income tax expense (benefit)	33,683		10,281		(6,814		)	37,150
Net income (loss)	289,665		19,093		(4,497		)	304,261
Preferred stock dividends	—		—		8,063			8,063
Net income (loss) available to common shareholders	$	289,665	$	19,093	$	(12,560	)	$	296,198
Revenues from (expenses to) external customers	$	999,416	$	131,437	$	(4,809	)	$	1,126,044
Average assets (in millions)	$	28,795	$	34	$	3		$	28,832