Operating Segments (Tables)

12 Months Ended

Dec. 31, 2017

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 $32.8 billion, $29.3 billion and $30.7 billion at December 31, 2017, 2016 and 2015.

	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

	Banking		Frost Wealth Advisors			Non-Banks			Consolidated
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
2015
Net interest income (expense)	$	732,671	$	7,634		$	(3,673	)	$	736,632
Provision for loan losses	51,848		(3		)	—			51,845
Non-interest income	205,606		121,489			1,635			328,730
Non-interest expense	589,394		98,405			5,919			693,718
Income (loss) before income taxes	297,035		30,721			(7,957		)	319,799
Income tax expense (benefit)	34,997		10,753			(5,279		)	40,471
Net income (loss)	262,038		19,968			(2,678		)	279,328
Preferred stock dividends	—		—			8,063			8,063
Net income (loss) available to common shareholders	$	262,038	$	19,968		$	(10,741	)	$	271,265
Revenues from (expenses to) external customers	$	938,277	$	129,123		$	(2,038	)	$	1,065,362
Average assets (in millions)	$	28,023	$	36		$	2		$	28,061